This study,integrating both domestic and international literatures as well as field research findings,presents a comprehensive review of the geographical distribution,ecological and physiological characteristics of Ac...This study,integrating both domestic and international literatures as well as field research findings,presents a comprehensive review of the geographical distribution,ecological and physiological characteristics of Acanthus ebracteatus.It further delves into the factors leading to its endangered status and proposes corresponding protection strategies.The mian reasons for the endangered of A.ebracteatus are as follows:illegal harvesting of whole plants,habitat destruction,reproductive obstacles,and competition or interference from invasive or noxious plant species.To address these threats,a series of conservation strategies are proposed.Firstly,in-depth research on the artificial propagation techniques of A.ebracteatus should be conducted to surmount reproductive barriers.Secondly,habitat restoration initiatives need to be carried out to create a suitable ecological setting.Thirdly,in-situ protections should be enhanced while the implementing ex-situ conservation measures.Meanwhile,continuous monitoring of A.ebracteatus seedlings should be conducted to strengthen subsequent management and conservation efforts.Finally,it is recommended to rationally explore and utilize the medicinal properties of A.ebracteatus.展开更多
An unusual diterpenoid excoagallochaol A （1）, together with epi-β-amyrin （2）, epitaraxerol （3）, epi-a-amyrin （4）, epilupeol （5）, betulin （6）, betulinic acid （7）, lupenone （8）, betulone （9）, betuloni...An unusual diterpenoid excoagallochaol A （1）, together with epi-β-amyrin （2）, epitaraxerol （3）, epi-a-amyrin （4）, epilupeol （5）, betulin （6）, betulinic acid （7）, lupenone （8）, betulone （9）, betulonic acid （10）, （9Z,12Z,15Z）-2,3-dihydroxypropyl octadecatrienoate （11）, and （9Z,12Z）-2,3-dihydroxypropyl octadecadienoate （12）were isolated from the stems of Excoecaria agallocha L. Their structures were elucidated by spectroscopic analyses, and the absolute stereochemistry of 1 was assigned using Mosher method. Compounds 4, 8, 10-12 were isolated from the genus Excoecaria for the first time.展开更多
Chemical examination of a Chinese mangrove plant Excoecaria agallocha L.led to the isolations of a new glucoside named l-（3,5-dimethoxy-4-hydroxybenzyl）-6-O-galloyl-l-O-β-D-glucopyranoside（1）,together with 10 kno...Chemical examination of a Chinese mangrove plant Excoecaria agallocha L.led to the isolations of a new glucoside named l-（3,5-dimethoxy-4-hydroxybenzyl）-6-O-galloyl-l-O-β-D-glucopyranoside（1）,together with 10 known glycosides including 3,5-dimethoxy-4-hydroxybenzyl-l-O-β-D-glucopyranoside（2）,hydrangeifolin I（3）,（2-methoxy-5-hydroxymethyl-phenyl） -l-O-β-D-（6-Ogalloyl） glucopyranoside（4）,（3,5-dimethoxy-4-hydroxyphenyl）-l-O-β-D-（6-O-galloyl） glucopyranoside （5）,3-methoxy-4-hydroxyphenyl l-O-β-D-（6-O-galloyl） glucopyranoside（6）,3,4,5-trimethoxyphenyl-（6-O-galloyl）-O-β-D-glucopyranoside （7）,koaburaside（8）,koaburaside monomethyl ether（9）,cuneatasides D（10）,and（？）-isosyringin（11）.Their structures were determined through the extensive spectroscopic analysis and comparison with the reported data in literature. Compounds 2-6,8-11 were isolated from the genus Excoecaria for the first time.展开更多
The current study aimed to investigate the chemical components of the Chinese mangrove plant Cerbera manghas L., collected in Hainan Island.Repeated column chromatography was performed for the isolation and purificati...The current study aimed to investigate the chemical components of the Chinese mangrove plant Cerbera manghas L., collected in Hainan Island.Repeated column chromatography was performed for the isolation and purification.Compounds were identified by the analysis of their 1D and 2D NMR data as well as IR and MS spectral data.A new linear monoterpene,named （2E,6S）-8-hydroxy-2-hydroxymethyl-6-rnethyl-2-octenoic acid（1）,together with cerbinal（2）,cerberidol（3）,2α,3β,24-trihydroxyolea- 12en-28oic acid（4）,4,4,9,7- tetrahydroxy-3,3 -dimethoxy-7,9-epoxylignan （5）, （-）-olovil （6）, （＋）-cycioolivil （7）, naringenin-7-glucoside （8）, aromadendrin （9）, naringenine （10）, and （＋）-dihydroquercetin （11） were isolated from the EtOH and CH2Cl2 extracts. Compounds 4, 5, 8-11 were isolated from this plant for the first time.展开更多
Two new harziane diterpenoids, named（9R,10R）-dihydro-harzianone（1） and harzianelactone（2）, were isolated from the endophytic fungus Trichoderma sp. Xy24 by using various column chromatography techniques. Their s...Two new harziane diterpenoids, named（9R,10R）-dihydro-harzianone（1） and harzianelactone（2）, were isolated from the endophytic fungus Trichoderma sp. Xy24 by using various column chromatography techniques. Their structures were determined on the basis of extensive spectroscopic（HR-ESI-MS, 1D NMR, 2D NMR and CD） analyses. Among them, 1 was the reductive product of harzianone and 2 was the Baeyer–Villiger monooxygenase catalyzed oxidation product of harzianone. Compound 1 exhibited cytotoxic activity against He La and MCF-7 cell lines with IC（50） values of 30.1 μmol/L and 30.7 μmol/L,respectively.展开更多
Objective:To isolate and evaluate the antimicrobial activity of the active principle(s)from the ethyl acetate(EtOAc)extract of endophytic fungus Colietotrichum gloeosporioides(C.gloeosporioides)isolated from Sonnerati...Objective:To isolate and evaluate the antimicrobial activity of the active principle(s)from the ethyl acetate(EtOAc)extract of endophytic fungus Colietotrichum gloeosporioides(C.gloeosporioides)isolated from Sonneratia apetala.Methods:Water agar technique was used to isolate the fungus,and both microscopic and molecular techniques were used for identification of the strain.Potato dextrose broth was used to grow the fungus in large-scale.Reversed-phase preparative HPLC analysis was performed to isolate the major active compound,kojic acid.The EtOAc extract and kojic acid were screened for their antimicrobial activity against two Grampositive and two Gram-negative bacteria as well as a fungal strain using the resazurin 96-well microtitre plate antimicrobial assay.Results:The fungus C.gloeosporioides was isolated from the leaves of Sonneratia apetala.Initial identification of the fugal isolate was carried out using spore characteristics observed under the microscope.Subsequently,the ITS1-5.8 S-ITS2 sequencing was employed for species-level identification of the fungus C.gloeosporioides.Five litres of liquid culture of the fungus produced approximately 610 mg of a mixture of secondary metabolites.Kojic acid(1)was isolated as the main secondary metabolite present in the fungal extract,and the structure was confirmed by 1 D,2 D NMR and mass spectrometry.The EtOAc extract and compound 1 exhibited considerable antimicrobial activity against all tested microorganisms.Whilst the minimum inhibitory concentration(MIC)values from the EtOAc extract ranged between 2.4×10^(-4)mg/mL and 2.5 mg/mL,those of kojic acid(1)were between 0.125 mg/mL and1 mg/mL.The EtOAc extract and kojic acid(1)were most active against Pseudomonas aeruginosa(MIC=2.4×10^(-4).mg/mL)and Micrococcus luteus(MIC=0.125 mg/mL),respectively.Conclusions:The results revealed that the endophytic fungus C.gloeosporioides could be a good source of commercially important kojic acid,which exhibited antimicrobial properties.展开更多
This paper reviews and discusses the technical terms and definition of mangrove and mangal, as well as mangrove plant. The word mangrove has been used to refer either to the constituent plant of tropical and subtropic...This paper reviews and discusses the technical terms and definition of mangrove and mangal, as well as mangrove plant. The word mangrove has been used to refer either to the constituent plant of tropical and subtropical intertidal community or to the community itself, but this usage makes more confusion. Being leaved mangrove in the more limited sense for the constituent plant species, mangal was proposed by MacNae (1968) as a term for mangrove community, which has been universally applied to most previous studies and should be adopted now. Mangrove should be therefore defined as a tropical and subtropical tree restricted to intertidal zones, which possesses some morphological specializion and physiological mechanism adapted to its habitat, and mangal as a tropical and subtropical forest community restricted to marine intertidal zones and periodically inundeated by the tides. A new term "consortive plant" is proposed here for herb, liana, epiphyte or parasite, which is restricted in the strict mangrove habitat.展开更多
Objective:To investigate 33 organic extracts of mangrove plants for:antiparasitic,anticancer,and antibacterial activities,as well as their ability to inhibit the activity of theα-glucosidase enzyme.Methods:Leaves fro...Objective:To investigate 33 organic extracts of mangrove plants for:antiparasitic,anticancer,and antibacterial activities,as well as their ability to inhibit the activity of theα-glucosidase enzyme.Methods:Leaves from all different plant mangrove species located in five mangrove zones of the Pacific coast of Panama were collected according to standard procedures.Qualitative phytochemical analysis of the organic extracts was performed by thin layer chromatography.The antiparasitic activity against Plasmodium falciparum,Trypanosoma cruzi and Leishmania donovani,toxicity against Artemia salina,anticancer activity in MCF-7 cell line,and antibacterial activity against Staphylococcus aureus,Bacillus subtilis,Escherichia coli and Pseudomonas aeruginosa of all organic extract were investigated according protocols stablished in our institution.Finally,the ability to inhibit the enzymatic activity ofα-glucosidase was evaluated by monitoring the hydrolysis of p-nitrophenylα-Dglucopyranoside.Results:Thirty-three different samples belonging to nine different species of vascular plants with seeds of true mangroves were collected.Triterpenoids,phenolics,and tannins were the main groups of compounds found in the sampled mangroves.Saponins,quinones,and coumarins were found in less than 50%of the samples.Laguncularia racemosa showed moderate activity against Plasmodium falciparum.None of the extracts presented anticancer activity.Rhizophora mangle exhibited potent activity against Staphylococcus aureus and Bacillus subtilis[(90.41±7.33)%and(96.02±6.14)%of inhibition];Avicennia germinans and Conocarpus erectus had activity against Escherichia coli[(71.17±6.15)%and(60.60±5.13)%of inhibition,respectively].About 60%of the mangroves showedα-glucosidase inhibitory activity.In particular,extracts from Laguncularia racemosa,Pelliciera rhizophorae,Conocarpus erectus,Mora oleifera,and Tabebuia palustris species showedα-glucosidase inhibitory potential,with IC_(50)values of(29.45±0.29),(20.60±0.70),(730.06±3.74),(25.59±0.37),and(853.39±5.30)μg/mL,respectively.Conclusions:Panamanian mangroves are mainly a promising potential source of hypoglycemic compounds,specificallyα-glucosidase inhibitors.These results highlight the therapeutic virtues of extracts from American mangrove plants.展开更多
Normal-phase and reversed-phase silica gel column chromatography and semi-preparative high performance liquid chromatography were applied to study the chemical constituents of the stems and twigs of the Hainan mangrov...Normal-phase and reversed-phase silica gel column chromatography and semi-preparative high performance liquid chromatography were applied to study the chemical constituents of the stems and twigs of the Hainan mangrove plant,Excoecaria agallocha L.A new 3,4-seco-ent-kaurane diterpenoid,named agallochanin acid A(1),and a rare ent-tetranorlabdane diterpenoid,named agallochanin acid B(2),along with four known diterpenoids were isolated.Their structures including absolute configurations were characterized via HR-ESI-MS,extensive 1D and 2D NMR investigations and calculated and experimental electronic circular dichroism(ECD)data.All isolates were tested for their inhibitory effects on NO production in lipopolysaccharide(LPS)-activated BV-2 cells.ent-3,4-Seco-17-oxo-kaur-4(19),15(16)-dien-3-oic acid(3)and ent-15-hydroxy-labda-8(17),13E-dien-3-one(5)exhibited considerable anti-neuroinflammatory activities with IC50 values of(14.32±1.99)and(4.24±0.37)μmol/L.展开更多
Mangroves are salt-tolerant forest ecosystem that extends between tropical and subtropicalintertidal regions of the world. Mangroves are biochemically unique vegetation that produce wide array of naturalproducts with ...Mangroves are salt-tolerant forest ecosystem that extends between tropical and subtropicalintertidal regions of the world. Mangroves are biochemically unique vegetation that produce wide array of naturalproducts with immense medicinal potential. These plants are the most valuable resources and provide economicand ecological benefits to the coastal people. Natural products from these plants are of great interest as theyprovide innumerable direct and indirect benefits to human beings for the discovery of novel antimicrobial andother bioactive compounds. They possess active metabolites with some novel chemical structures that belong todiverse chemical classes such as alkaloids, phenol, steroids, terpenoids and tannins. Several mangrove specieshave been used in traditional medicine or have few applications as insecticide and pesticide. To date, severalmangroves, and their associated species and solvent extracts are screened for antimicrobial activity along withthe presence of potent bioactive compounds. The present article emphasizes and creates awareness aboutthe potential mangrove plants and their associates as a source of biologically active compounds with potentantimicrobial properties. This paper also elaborates the mechanisms of action and various methods for screeningof antimicrobial compounds.展开更多
This study is proposed by Kien Giang University to the Ministry of Education and Training with the aim investigate species abundant in the Mekong Delta to develop land in Vietnam.Western Mekong Delta(WMD)alluvium sedi...This study is proposed by Kien Giang University to the Ministry of Education and Training with the aim investigate species abundant in the Mekong Delta to develop land in Vietnam.Western Mekong Delta(WMD)alluvium sediments flows from upstream China to Vietnam.This sediments accumulated gradually elevation the new land.The coastal where mangrove forests with a rich ecosystem of plants and animals.Over time,these forests change,with different plant species succeeding each other.Biodiversity of tree species,and abundance communities,measured growth of the forest in this region.In 2023,a comprehensive survey was conducted.Investigate the situation of woody plant species in mangrove forests in sub-regions.The methods investigate is indentified the number of survey plots have done depend on the density of the forest,Base on the width of the forest range,the number of survey plots in sub region set up from 10 to 15 plots.In total,68 plots have done established,plot is 100 square meters.Found the number of species in each ecological region and growth situation.The results of study are provided scientifically based information of the tree species composition,distribution,and community structures;this result had 16 species from 11 plant families is determined.Among these species have 6 dominant species.Main discovery is found two species grow on the best on new land were Avicennia officinalis and Avicennia alba can develope on the original new land.These adapted species can exploit food and medicinal herbs in biodiversity distribution abundance of these species.It can help Vietnam by mearsures using the species Aviecennia be discovered will promote sea reclamation faster instead of letting the natural law of sea reclamation follow.Conclusion there are 7 species in high land,11 species medium land,8 species low land 6 species lowest land,of which 2 species found that can planting in this area in target for land reclamation in this area.展开更多
Interactions among roots and leaves are fundamental for plant growth and survival, yet there remains a knowledge gap in mangrove plants that experience saline stress distinct from most other vascular plants hereafter ...Interactions among roots and leaves are fundamental for plant growth and survival, yet there remains a knowledge gap in mangrove plants that experience saline stress distinct from most other vascular plants hereafter the non-mangroves. Here, we explored the coordination of above- and below-ground trait relationships among mangrove species in tropical China and compared it with those of non-mangroves. Our results show that root stele, the water-conducting tissue, was coupled with leaf water use traits and tissues outside the stele (ToS), the carbon-consuming tissues in roots, were independent of leaf economics traits in non-mangroves. However, in mangroves, root stele is independent of leaf water use traits and root ToS is coupled with leaf economics traits. The contrasting root–leaf coordination between mangroves and non-mangroves potentially arises from the existence of leaf water storage tissues in mangroves and the universal allometric relationship between root stele and ToS in both plant groups. Our findings pave a new way for understanding the ecology and vegetation dynamics of mangrove and non-mangrove plants under global environmental change.展开更多
基金Supported by Special Innovation Projects for Regular Institutions of Higher Education in Guangdong Province(2023KTSCX071)Zhanjiang Science and Technology Bureau Project(2023A01018)Colonel-level Project(LY2207).
文摘This study,integrating both domestic and international literatures as well as field research findings,presents a comprehensive review of the geographical distribution,ecological and physiological characteristics of Acanthus ebracteatus.It further delves into the factors leading to its endangered status and proposes corresponding protection strategies.The mian reasons for the endangered of A.ebracteatus are as follows:illegal harvesting of whole plants,habitat destruction,reproductive obstacles,and competition or interference from invasive or noxious plant species.To address these threats,a series of conservation strategies are proposed.Firstly,in-depth research on the artificial propagation techniques of A.ebracteatus should be conducted to surmount reproductive barriers.Secondly,habitat restoration initiatives need to be carried out to create a suitable ecological setting.Thirdly,in-situ protections should be enhanced while the implementing ex-situ conservation measures.Meanwhile,continuous monitoring of A.ebracteatus seedlings should be conducted to strengthen subsequent management and conservation efforts.Finally,it is recommended to rationally explore and utilize the medicinal properties of A.ebracteatus.
文摘An unusual diterpenoid excoagallochaol A （1）, together with epi-β-amyrin （2）, epitaraxerol （3）, epi-a-amyrin （4）, epilupeol （5）, betulin （6）, betulinic acid （7）, lupenone （8）, betulone （9）, betulonic acid （10）, （9Z,12Z,15Z）-2,3-dihydroxypropyl octadecatrienoate （11）, and （9Z,12Z）-2,3-dihydroxypropyl octadecadienoate （12）were isolated from the stems of Excoecaria agallocha L. Their structures were elucidated by spectroscopic analyses, and the absolute stereochemistry of 1 was assigned using Mosher method. Compounds 4, 8, 10-12 were isolated from the genus Excoecaria for the first time.
文摘Chemical examination of a Chinese mangrove plant Excoecaria agallocha L.led to the isolations of a new glucoside named l-（3,5-dimethoxy-4-hydroxybenzyl）-6-O-galloyl-l-O-β-D-glucopyranoside（1）,together with 10 known glycosides including 3,5-dimethoxy-4-hydroxybenzyl-l-O-β-D-glucopyranoside（2）,hydrangeifolin I（3）,（2-methoxy-5-hydroxymethyl-phenyl） -l-O-β-D-（6-Ogalloyl） glucopyranoside（4）,（3,5-dimethoxy-4-hydroxyphenyl）-l-O-β-D-（6-O-galloyl） glucopyranoside （5）,3-methoxy-4-hydroxyphenyl l-O-β-D-（6-O-galloyl） glucopyranoside（6）,3,4,5-trimethoxyphenyl-（6-O-galloyl）-O-β-D-glucopyranoside （7）,koaburaside（8）,koaburaside monomethyl ether（9）,cuneatasides D（10）,and（？）-isosyringin（11）.Their structures were determined through the extensive spectroscopic analysis and comparison with the reported data in literature. Compounds 2-6,8-11 were isolated from the genus Excoecaria for the first time.
基金NSFC(Grant No.30672607)the National 863HiTech Projects(Grant No.2006AA09Z446,2006DFA31100)China Uni-PhD Base Project(Grant No.20060001149).
文摘The current study aimed to investigate the chemical components of the Chinese mangrove plant Cerbera manghas L., collected in Hainan Island.Repeated column chromatography was performed for the isolation and purification.Compounds were identified by the analysis of their 1D and 2D NMR data as well as IR and MS spectral data.A new linear monoterpene,named （2E,6S）-8-hydroxy-2-hydroxymethyl-6-rnethyl-2-octenoic acid（1）,together with cerbinal（2）,cerberidol（3）,2α,3β,24-trihydroxyolea- 12en-28oic acid（4）,4,4,9,7- tetrahydroxy-3,3 -dimethoxy-7,9-epoxylignan （5）, （-）-olovil （6）, （＋）-cycioolivil （7）, naringenin-7-glucoside （8）, aromadendrin （9）, naringenine （10）, and （＋）-dihydroquercetin （11） were isolated from the EtOH and CH2Cl2 extracts. Compounds 4, 5, 8-11 were isolated from this plant for the first time.
基金supported by the Science & Technology Project of Guangdong Province (No. 2011A080403020)
文摘Two new harziane diterpenoids, named（9R,10R）-dihydro-harzianone（1） and harzianelactone（2）, were isolated from the endophytic fungus Trichoderma sp. Xy24 by using various column chromatography techniques. Their structures were determined on the basis of extensive spectroscopic（HR-ESI-MS, 1D NMR, 2D NMR and CD） analyses. Among them, 1 was the reductive product of harzianone and 2 was the Baeyer–Villiger monooxygenase catalyzed oxidation product of harzianone. Compound 1 exhibited cytotoxic activity against He La and MCF-7 cell lines with IC（50） values of 30.1 μmol/L and 30.7 μmol/L,respectively.
基金financially supported by the Robert S McNamara Fellowship Programme from the World Bank offered to Tauhidur Rahman Nurunnabi
文摘Objective:To isolate and evaluate the antimicrobial activity of the active principle(s)from the ethyl acetate(EtOAc)extract of endophytic fungus Colietotrichum gloeosporioides(C.gloeosporioides)isolated from Sonneratia apetala.Methods:Water agar technique was used to isolate the fungus,and both microscopic and molecular techniques were used for identification of the strain.Potato dextrose broth was used to grow the fungus in large-scale.Reversed-phase preparative HPLC analysis was performed to isolate the major active compound,kojic acid.The EtOAc extract and kojic acid were screened for their antimicrobial activity against two Grampositive and two Gram-negative bacteria as well as a fungal strain using the resazurin 96-well microtitre plate antimicrobial assay.Results:The fungus C.gloeosporioides was isolated from the leaves of Sonneratia apetala.Initial identification of the fugal isolate was carried out using spore characteristics observed under the microscope.Subsequently,the ITS1-5.8 S-ITS2 sequencing was employed for species-level identification of the fungus C.gloeosporioides.Five litres of liquid culture of the fungus produced approximately 610 mg of a mixture of secondary metabolites.Kojic acid(1)was isolated as the main secondary metabolite present in the fungal extract,and the structure was confirmed by 1 D,2 D NMR and mass spectrometry.The EtOAc extract and compound 1 exhibited considerable antimicrobial activity against all tested microorganisms.Whilst the minimum inhibitory concentration(MIC)values from the EtOAc extract ranged between 2.4×10^(-4)mg/mL and 2.5 mg/mL,those of kojic acid(1)were between 0.125 mg/mL and1 mg/mL.The EtOAc extract and kojic acid(1)were most active against Pseudomonas aeruginosa(MIC=2.4×10^(-4).mg/mL)and Micrococcus luteus(MIC=0.125 mg/mL),respectively.Conclusions:The results revealed that the endophytic fungus C.gloeosporioides could be a good source of commercially important kojic acid,which exhibited antimicrobial properties.
基金This study is supported by the Key Program of National Natural Science Foundation of China (39830310).
文摘This paper reviews and discusses the technical terms and definition of mangrove and mangal, as well as mangrove plant. The word mangrove has been used to refer either to the constituent plant of tropical and subtropical intertidal community or to the community itself, but this usage makes more confusion. Being leaved mangrove in the more limited sense for the constituent plant species, mangal was proposed by MacNae (1968) as a term for mangrove community, which has been universally applied to most previous studies and should be adopted now. Mangrove should be therefore defined as a tropical and subtropical tree restricted to intertidal zones, which possesses some morphological specializion and physiological mechanism adapted to its habitat, and mangal as a tropical and subtropical forest community restricted to marine intertidal zones and periodically inundeated by the tides. A new term "consortive plant" is proposed here for herb, liana, epiphyte or parasite, which is restricted in the strict mangrove habitat.
基金partially supported by the National Secretariat for Science and Technology of Panama(SENACYT)[grant number FID14-063]supported by funds from the National Secretariat of Science,Technology and Innovation(SENACYT)doctoral[grant number 270-2011-154]supported by funds from the National Research System of SENACYT[SNI1472016 and SNI1452016,respectively]
文摘Objective:To investigate 33 organic extracts of mangrove plants for:antiparasitic,anticancer,and antibacterial activities,as well as their ability to inhibit the activity of theα-glucosidase enzyme.Methods:Leaves from all different plant mangrove species located in five mangrove zones of the Pacific coast of Panama were collected according to standard procedures.Qualitative phytochemical analysis of the organic extracts was performed by thin layer chromatography.The antiparasitic activity against Plasmodium falciparum,Trypanosoma cruzi and Leishmania donovani,toxicity against Artemia salina,anticancer activity in MCF-7 cell line,and antibacterial activity against Staphylococcus aureus,Bacillus subtilis,Escherichia coli and Pseudomonas aeruginosa of all organic extract were investigated according protocols stablished in our institution.Finally,the ability to inhibit the enzymatic activity ofα-glucosidase was evaluated by monitoring the hydrolysis of p-nitrophenylα-Dglucopyranoside.Results:Thirty-three different samples belonging to nine different species of vascular plants with seeds of true mangroves were collected.Triterpenoids,phenolics,and tannins were the main groups of compounds found in the sampled mangroves.Saponins,quinones,and coumarins were found in less than 50%of the samples.Laguncularia racemosa showed moderate activity against Plasmodium falciparum.None of the extracts presented anticancer activity.Rhizophora mangle exhibited potent activity against Staphylococcus aureus and Bacillus subtilis[(90.41±7.33)%and(96.02±6.14)%of inhibition];Avicennia germinans and Conocarpus erectus had activity against Escherichia coli[(71.17±6.15)%and(60.60±5.13)%of inhibition,respectively].About 60%of the mangroves showedα-glucosidase inhibitory activity.In particular,extracts from Laguncularia racemosa,Pelliciera rhizophorae,Conocarpus erectus,Mora oleifera,and Tabebuia palustris species showedα-glucosidase inhibitory potential,with IC_(50)values of(29.45±0.29),(20.60±0.70),(730.06±3.74),(25.59±0.37),and(853.39±5.30)μg/mL,respectively.Conclusions:Panamanian mangroves are mainly a promising potential source of hypoglycemic compounds,specificallyα-glucosidase inhibitors.These results highlight the therapeutic virtues of extracts from American mangrove plants.
文摘Normal-phase and reversed-phase silica gel column chromatography and semi-preparative high performance liquid chromatography were applied to study the chemical constituents of the stems and twigs of the Hainan mangrove plant,Excoecaria agallocha L.A new 3,4-seco-ent-kaurane diterpenoid,named agallochanin acid A(1),and a rare ent-tetranorlabdane diterpenoid,named agallochanin acid B(2),along with four known diterpenoids were isolated.Their structures including absolute configurations were characterized via HR-ESI-MS,extensive 1D and 2D NMR investigations and calculated and experimental electronic circular dichroism(ECD)data.All isolates were tested for their inhibitory effects on NO production in lipopolysaccharide(LPS)-activated BV-2 cells.ent-3,4-Seco-17-oxo-kaur-4(19),15(16)-dien-3-oic acid(3)and ent-15-hydroxy-labda-8(17),13E-dien-3-one(5)exhibited considerable anti-neuroinflammatory activities with IC50 values of(14.32±1.99)and(4.24±0.37)μmol/L.
文摘Mangroves are salt-tolerant forest ecosystem that extends between tropical and subtropicalintertidal regions of the world. Mangroves are biochemically unique vegetation that produce wide array of naturalproducts with immense medicinal potential. These plants are the most valuable resources and provide economicand ecological benefits to the coastal people. Natural products from these plants are of great interest as theyprovide innumerable direct and indirect benefits to human beings for the discovery of novel antimicrobial andother bioactive compounds. They possess active metabolites with some novel chemical structures that belong todiverse chemical classes such as alkaloids, phenol, steroids, terpenoids and tannins. Several mangrove specieshave been used in traditional medicine or have few applications as insecticide and pesticide. To date, severalmangroves, and their associated species and solvent extracts are screened for antimicrobial activity along withthe presence of potent bioactive compounds. The present article emphasizes and creates awareness aboutthe potential mangrove plants and their associates as a source of biologically active compounds with potentantimicrobial properties. This paper also elaborates the mechanisms of action and various methods for screeningof antimicrobial compounds.
文摘This study is proposed by Kien Giang University to the Ministry of Education and Training with the aim investigate species abundant in the Mekong Delta to develop land in Vietnam.Western Mekong Delta(WMD)alluvium sediments flows from upstream China to Vietnam.This sediments accumulated gradually elevation the new land.The coastal where mangrove forests with a rich ecosystem of plants and animals.Over time,these forests change,with different plant species succeeding each other.Biodiversity of tree species,and abundance communities,measured growth of the forest in this region.In 2023,a comprehensive survey was conducted.Investigate the situation of woody plant species in mangrove forests in sub-regions.The methods investigate is indentified the number of survey plots have done depend on the density of the forest,Base on the width of the forest range,the number of survey plots in sub region set up from 10 to 15 plots.In total,68 plots have done established,plot is 100 square meters.Found the number of species in each ecological region and growth situation.The results of study are provided scientifically based information of the tree species composition,distribution,and community structures;this result had 16 species from 11 plant families is determined.Among these species have 6 dominant species.Main discovery is found two species grow on the best on new land were Avicennia officinalis and Avicennia alba can develope on the original new land.These adapted species can exploit food and medicinal herbs in biodiversity distribution abundance of these species.It can help Vietnam by mearsures using the species Aviecennia be discovered will promote sea reclamation faster instead of letting the natural law of sea reclamation follow.Conclusion there are 7 species in high land,11 species medium land,8 species low land 6 species lowest land,of which 2 species found that can planting in this area in target for land reclamation in this area.
基金funded by the National Natural Science Foundation of China (32471824,32171746,31870522,31670550,42077450)the leading talents of basic research in Henan Province+3 种基金Excellent Youth Creative Research Group Project in Henan ProvinceForeign Scientists Studio in Henan province(GZS2025011)the Funding for Characteristic and Backbone Forestry Discipline Group of Henan Provincethe Scientific Research Foundation of Henan Agricultural University (30500854)。
文摘Interactions among roots and leaves are fundamental for plant growth and survival, yet there remains a knowledge gap in mangrove plants that experience saline stress distinct from most other vascular plants hereafter the non-mangroves. Here, we explored the coordination of above- and below-ground trait relationships among mangrove species in tropical China and compared it with those of non-mangroves. Our results show that root stele, the water-conducting tissue, was coupled with leaf water use traits and tissues outside the stele (ToS), the carbon-consuming tissues in roots, were independent of leaf economics traits in non-mangroves. However, in mangroves, root stele is independent of leaf water use traits and root ToS is coupled with leaf economics traits. The contrasting root–leaf coordination between mangroves and non-mangroves potentially arises from the existence of leaf water storage tissues in mangroves and the universal allometric relationship between root stele and ToS in both plant groups. Our findings pave a new way for understanding the ecology and vegetation dynamics of mangrove and non-mangrove plants under global environmental change.
