To select the suitable plant species controlling Eupatorium adenophorum in hilly area, ecological adaptability, competitiveness and control efficacy of many replacement plants with economic value in Guizhou Province o...To select the suitable plant species controlling Eupatorium adenophorum in hilly area, ecological adaptability, competitiveness and control efficacy of many replacement plants with economic value in Guizhou Province of China were studied. The results showed that the coverage of paspalum wetsfeteini and Dolichos lablab were 100% and 93%, which increased by 3.70 and 3.44 times compared with Lolium perenne, respectively; their relative crowding coefficient with E. adenophorum were 7.09 and 22.78, which increased by 2.43 and 7.80 times compared with L perenroe, respectively. Using excavation method, the control efficacies of replacement plants were 99.3 % and 96.9%, respectively, while the control efficacy of replacement plants using mowing method was lower than 66.4%. The overwintering rate of P. wetsfeteini in the following year was 95% ; its coverage was still 100% and its control efficacy against E. adenophorum remained over 99%. D. lablab was difficult to survive the winter in the north region beyond 26.2°N, so it could only be applied as annual replacement plant. The coverage of Setaria anceps, Cajanus cajan and other test plants were less than 90%, with poor control efficacy against E. adenophorum.展开更多
Eupatorium Adenophorum Spreng leaves extract(EASLE)was prepared by heating reflux extraction method.The inhibition performance of EASLE on CRS in 0.10 M Cl2 CHCOOH solution was fully studied by weight-loss,electrochem...Eupatorium Adenophorum Spreng leaves extract(EASLE)was prepared by heating reflux extraction method.The inhibition performance of EASLE on CRS in 0.10 M Cl2 CHCOOH solution was fully studied by weight-loss,electrochemical techniques and surface characterizations.The main chemical components in EASLE were analyzed by liquid chromatography-mass spectrometry(LC-MS).The adsorption mecha-nism of these active components was theoretically studied by quantum chemical calculations and molec-ular dynamic(MD)simulations.The results show that EASLE can efficiently retard the corrosion of CRS in Cl_(2)CHCOOH media,and the maximum inhibition efficiency of 400 mg L^(−1)EASLE reaches as high as 91.4%at 40℃.The adsorption of EASLE on CRS surface conforms to Langmuir isotherm.From poten-tiodynamic polarization curves,EASLE is a mixed inhibitor through“geometric blocking effect”.Nyquist appears a capactive loop with one time constant,and the charge transfer resistance increases significantly after adding EASLE.The inhibition performance is inversely proportional to the surface tension,but pro-portional to the conductivity of the inhibited solutions.The microanalysis of CRS surface verifies that EASLE can efficiently adsorb onto CRS surface to form a protective film.EASLE exerts inhibition through its various components,in which the main corrosion inhibiting components are flavonoids and purines.The active adsorption sites of these compounds are concentrated on the benzene ring,C=O as well as N-heterocyclic ring.MD simulations indicate that quercetin,guanine,and their protonated molecules adsorb on Fe(001)surface in a nearly flat orientation.展开更多
A new sequiterpenoid compound 8aa-hydroxy-l-isopropyl-4,7-dimethyl-l,2,3,4,6,8a-hexahydro-naphthalene-2,6- dione （1）, together with seven known compounds anti-HH-dimer-coumarin （2）, （-）-5-exo-hydroxy-borneol （3...A new sequiterpenoid compound 8aa-hydroxy-l-isopropyl-4,7-dimethyl-l,2,3,4,6,8a-hexahydro-naphthalene-2,6- dione （1）, together with seven known compounds anti-HH-dimer-coumarin （2）, （-）-5-exo-hydroxy-borneol （3）, O-hydroxyl cinnamic acid （4）, 9β-hydroxy-ageraphorone （5）, 10Hα-9-oxo-ageraphorone （6）, 10Hβ-9-oxo- ageraphorone （7） and 9-oxo-10,11-dehydroageraphorone 8, was isolated from the leaves of Eupatorium adenopho- rum Spreng. The structures were elucidated by IR, ^1H and ^13C NMR, EIMS, HMBC and single-crystal X-ray spectral data.展开更多
基金Supported by Special Fund for Agro-scientific Research in the Public Interest"Research and Demonstration of Comprehensive Prevention Technology against Invasive Plants"(201103027)
文摘To select the suitable plant species controlling Eupatorium adenophorum in hilly area, ecological adaptability, competitiveness and control efficacy of many replacement plants with economic value in Guizhou Province of China were studied. The results showed that the coverage of paspalum wetsfeteini and Dolichos lablab were 100% and 93%, which increased by 3.70 and 3.44 times compared with Lolium perenne, respectively; their relative crowding coefficient with E. adenophorum were 7.09 and 22.78, which increased by 2.43 and 7.80 times compared with L perenroe, respectively. Using excavation method, the control efficacies of replacement plants were 99.3 % and 96.9%, respectively, while the control efficacy of replacement plants using mowing method was lower than 66.4%. The overwintering rate of P. wetsfeteini in the following year was 95% ; its coverage was still 100% and its control efficacy against E. adenophorum remained over 99%. D. lablab was difficult to survive the winter in the north region beyond 26.2°N, so it could only be applied as annual replacement plant. The coverage of Setaria anceps, Cajanus cajan and other test plants were less than 90%, with poor control efficacy against E. adenophorum.
基金financially by Fundamental Research Project for Distinguished Young Scholars in Yunnan Province(No.202001AV070008)National Natural Science Foundation of China(No.52161016)+3 种基金Yunnan Provincial Academician Workstation(No.202305AF150009)Joint Key Project of Agricultural Fundamental Research in Yunnan Province(No.202101BD070001-017)Special Project of"Top Young Talents"of Yunnan Ten Thousand Talents Plan(No.51900109)Special Project of"Leading Talents of Industrial Technology"of Yunnan Ten Thousand Talents Plan(No.80201408)are acknowledged.
文摘Eupatorium Adenophorum Spreng leaves extract(EASLE)was prepared by heating reflux extraction method.The inhibition performance of EASLE on CRS in 0.10 M Cl2 CHCOOH solution was fully studied by weight-loss,electrochemical techniques and surface characterizations.The main chemical components in EASLE were analyzed by liquid chromatography-mass spectrometry(LC-MS).The adsorption mecha-nism of these active components was theoretically studied by quantum chemical calculations and molec-ular dynamic(MD)simulations.The results show that EASLE can efficiently retard the corrosion of CRS in Cl_(2)CHCOOH media,and the maximum inhibition efficiency of 400 mg L^(−1)EASLE reaches as high as 91.4%at 40℃.The adsorption of EASLE on CRS surface conforms to Langmuir isotherm.From poten-tiodynamic polarization curves,EASLE is a mixed inhibitor through“geometric blocking effect”.Nyquist appears a capactive loop with one time constant,and the charge transfer resistance increases significantly after adding EASLE.The inhibition performance is inversely proportional to the surface tension,but pro-portional to the conductivity of the inhibited solutions.The microanalysis of CRS surface verifies that EASLE can efficiently adsorb onto CRS surface to form a protective film.EASLE exerts inhibition through its various components,in which the main corrosion inhibiting components are flavonoids and purines.The active adsorption sites of these compounds are concentrated on the benzene ring,C=O as well as N-heterocyclic ring.MD simulations indicate that quercetin,guanine,and their protonated molecules adsorb on Fe(001)surface in a nearly flat orientation.
基金Project supported by National Natural Science Foundation of China （No. 20372010）, Trans-Century Training Program Foundation for the Talents, Ministry of Education of China and Important technical research in agricultural structure regulation of agricultural department （No. 2003-11-04A）.
文摘A new sequiterpenoid compound 8aa-hydroxy-l-isopropyl-4,7-dimethyl-l,2,3,4,6,8a-hexahydro-naphthalene-2,6- dione （1）, together with seven known compounds anti-HH-dimer-coumarin （2）, （-）-5-exo-hydroxy-borneol （3）, O-hydroxyl cinnamic acid （4）, 9β-hydroxy-ageraphorone （5）, 10Hα-9-oxo-ageraphorone （6）, 10Hβ-9-oxo- ageraphorone （7） and 9-oxo-10,11-dehydroageraphorone 8, was isolated from the leaves of Eupatorium adenopho- rum Spreng. The structures were elucidated by IR, ^1H and ^13C NMR, EIMS, HMBC and single-crystal X-ray spectral data.
