The effects of different application levels and species of phosphatic fertilizer on Eleocharis dulcis were studied. The results showed that the growth stage of Eleocharis dulcis was not significantly influenced by dif...The effects of different application levels and species of phosphatic fertilizer on Eleocharis dulcis were studied. The results showed that the growth stage of Eleocharis dulcis was not significantly influenced by different levels of phosphatic fertilizer application, with phosphorus level in 195-375 kg/hm^2. With increasing of the phosphorus level, starch and total soluble sugar accumulated, but the yield was not improved significantly. The analysis on the economic benefits showed that the best phosphorus level was 195 kg/hm^2. The growth stage and yield of Eleocharis dulcis were not considerably influenced by different proportions of calcium-magnesia phosphate fertilizer and ammonium dihydrogen phosphate. With increasing of ammonium dihydrogen phosphate, big-fruit rate of Eleocharis dulcis kept growing, but the accumulations of starch and total soluble sugar were decreasing.展开更多
The recently published study by Liu et al.(2024)on a high-quality,chromosome-level genome of Eleocharis vivipara provides new insight into the multiple evolution of C_(4)photosynthesis in Cyperaceae and in particular ...The recently published study by Liu et al.(2024)on a high-quality,chromosome-level genome of Eleocharis vivipara provides new insight into the multiple evolution of C_(4)photosynthesis in Cyperaceae and in particular in Eleocharis.The species studied has the rare feature of alternately using C_(3)photosynthesis underwater and C_(4)photosynthesis on land(Ueno et al.,1988),making it an exciting model to better understand the genetic control and evolution of the C_(4)trait and,in particular,the evolutionary challenge to switch from C_(3)to C_(4)photosynthesis from the aquatic to the terrestrial environment.展开更多
Eleocharis vivipara,an amphibious sedge in the Cyperaceae family,has several remarkable properties,most notably its alternate use of C_(3)photosynthesis underwater and C_(4)photosynthesis on land.However,the absence o...Eleocharis vivipara,an amphibious sedge in the Cyperaceae family,has several remarkable properties,most notably its alternate use of C_(3)photosynthesis underwater and C_(4)photosynthesis on land.However,the absence of genomic data has hindered its utility for evolutionary and genetic research.Here,we present a high-quality genome for E.vivipara,representing the first chromosome-level genome for the Eleocharis genus,with an approximate size of 965.22 Mb mainly distributed across 10 chromosomes.Its Hi–C pattern,chromosome clustering results,and one-to-one genome synteny across two subgroups indicates a tetraploid structure with chromosome count 2n=4x=20.Phylogenetic analysis suggests that E.vivipara diverged from Cyperus esculentus approximately 32.96million years ago(Mya),and underwent a wholegenome duplication(WGD)about 3.5 Mya.Numerous fusion and fission events were identified between the chromosomes of E.vivipara and its close relatives.We demonstrate that E.vivipara has holocentromeres,a chromosomal feature which can maintain the stability of such chromosomal rearrangements.Experimental transplantation and cross-section studies showed its terrestrial culms developed C_(4)Kranz anatomy with increased number of chloroplasts in the bundle sheath(BS)cells.Gene expression and weighted gene co-expression network analysis(WGCNA)showed overall elevated expression of core genes associated with the C_(4)pathway,and significant enrichment of genes related to modified culm anatomy and photosynthesis efficiency.We found evidence of mixed nicotinamide adenine dinucleotide-malic enzyme and phosphoenolpyruvate carboxykinase type C_(4)photosynthesis in E.vivipara,and hypothesize that the evolution of C_(4)photosynthesis predates the WGD event.The mixed type is dominated by subgenome A and supplemented by subgenome B.Collectively,our findings not only shed light on the evolution of E.vivipara and karyotype within the Cyperaceae family,but also provide valuable insights into the transition between C_(3)and C_(4)photosynthesis,offering promising avenues for crop improvement and breeding.展开更多
The removal efficiency of Cu and Zn from swine wastewater was evaluated as effected by three variables: the hydraulic retention time (HRT) (24, 48, 72 and 96 hours), two different plant species (Typha domingensis Pers...The removal efficiency of Cu and Zn from swine wastewater was evaluated as effected by three variables: the hydraulic retention time (HRT) (24, 48, 72 and 96 hours), two different plant species (Typha domingensis Pers. and Eleocharis cellulosa) and two different sizes of filter media (5 and 15 mm) using a horizontal sub-surface flow constructed wetland. From the results, a significant difference was observed in the removal efficiency of Cu and Zn with respect to different hydraulic retention times. The best results were obtained in the HRT of 96 hours for Zn where 96% removal of Zn with Typha domingensis Pers. specie with gravel of 15 mm (experimental unit 6) was achieved. For Cu, at 72 hours of HRT, the efficiency was nearly 100% in five of the six study units (1, 2, 3, 5 and 6). In contrast, in experimental unit 4 with gravel of 15 mm and without plants, only 86% Cu removal was achieved.展开更多
Water chestnut(Eleocharis dulcis)is widely cultivated in many countries for its edible and starchy corms.In this study,starches were separated from Guangxi biqi,Hubei biqi and Anhui biqi,and the morphological and phys...Water chestnut(Eleocharis dulcis)is widely cultivated in many countries for its edible and starchy corms.In this study,starches were separated from Guangxi biqi,Hubei biqi and Anhui biqi,and the morphological and physicochemical characteristics of the starches were systematically investigated.There were significant differences in granule size,total starch and amylose contents among starches from the three water chestnuts which present similar X-ray diffraction patterns and Fourier transform infrared spectroscopy.The starch of Guangxi biqi exhibited higher swelling power and solubility than that of Hubei biqi and Anhui biqi.Thermal and pasting properties of starch were different among the three water chestnuts.When hydrolyzed by porcine pancreaticα-amylase(PPA),starches from Hubei biqi and Anhui biqi had higher hydrolysis degree.The starches from the three water chestnut varieties differed significantly in morphological and physicochemical properties,and these studies may provide useful information for future exploitation and application of water chestnut starch in food and non-food industries.展开更多
基金Supported by Key Projects in Hubei Science&Technology Pillar Program in 2015(2015BBA199)Guangxi Agricultural Department Science Research ProgramHubei Agricultural S&T Innovation(2016-620-007-001)
文摘The effects of different application levels and species of phosphatic fertilizer on Eleocharis dulcis were studied. The results showed that the growth stage of Eleocharis dulcis was not significantly influenced by different levels of phosphatic fertilizer application, with phosphorus level in 195-375 kg/hm^2. With increasing of the phosphorus level, starch and total soluble sugar accumulated, but the yield was not improved significantly. The analysis on the economic benefits showed that the best phosphorus level was 195 kg/hm^2. The growth stage and yield of Eleocharis dulcis were not considerably influenced by different proportions of calcium-magnesia phosphate fertilizer and ammonium dihydrogen phosphate. With increasing of ammonium dihydrogen phosphate, big-fruit rate of Eleocharis dulcis kept growing, but the accumulations of starch and total soluble sugar were decreasing.
基金supported by LabEx TULIP (ANR-10-LABX-0041) and CEBA (ANR-10-LABX-25-01) both managed by the French Agence nationale de la recherche.
文摘The recently published study by Liu et al.(2024)on a high-quality,chromosome-level genome of Eleocharis vivipara provides new insight into the multiple evolution of C_(4)photosynthesis in Cyperaceae and in particular in Eleocharis.The species studied has the rare feature of alternately using C_(3)photosynthesis underwater and C_(4)photosynthesis on land(Ueno et al.,1988),making it an exciting model to better understand the genetic control and evolution of the C_(4)trait and,in particular,the evolutionary challenge to switch from C_(3)to C_(4)photosynthesis from the aquatic to the terrestrial environment.
基金funded by the National Natural Science Foundation of China(32300217)the National Key R&D Program of China(2023YFA0914600)+2 种基金the Guangdong Basic and Applied Basic Research Foundation(2022A1515110358)the Guangdong Science and Technology Foundation,“Zhu Jiang Talent Innovation”project(2019ZT08N628)the Special Funds for Science Technology Innovation and Industrial Development of Shenzhen Dapeng New District(PT202101-01)。
文摘Eleocharis vivipara,an amphibious sedge in the Cyperaceae family,has several remarkable properties,most notably its alternate use of C_(3)photosynthesis underwater and C_(4)photosynthesis on land.However,the absence of genomic data has hindered its utility for evolutionary and genetic research.Here,we present a high-quality genome for E.vivipara,representing the first chromosome-level genome for the Eleocharis genus,with an approximate size of 965.22 Mb mainly distributed across 10 chromosomes.Its Hi–C pattern,chromosome clustering results,and one-to-one genome synteny across two subgroups indicates a tetraploid structure with chromosome count 2n=4x=20.Phylogenetic analysis suggests that E.vivipara diverged from Cyperus esculentus approximately 32.96million years ago(Mya),and underwent a wholegenome duplication(WGD)about 3.5 Mya.Numerous fusion and fission events were identified between the chromosomes of E.vivipara and its close relatives.We demonstrate that E.vivipara has holocentromeres,a chromosomal feature which can maintain the stability of such chromosomal rearrangements.Experimental transplantation and cross-section studies showed its terrestrial culms developed C_(4)Kranz anatomy with increased number of chloroplasts in the bundle sheath(BS)cells.Gene expression and weighted gene co-expression network analysis(WGCNA)showed overall elevated expression of core genes associated with the C_(4)pathway,and significant enrichment of genes related to modified culm anatomy and photosynthesis efficiency.We found evidence of mixed nicotinamide adenine dinucleotide-malic enzyme and phosphoenolpyruvate carboxykinase type C_(4)photosynthesis in E.vivipara,and hypothesize that the evolution of C_(4)photosynthesis predates the WGD event.The mixed type is dominated by subgenome A and supplemented by subgenome B.Collectively,our findings not only shed light on the evolution of E.vivipara and karyotype within the Cyperaceae family,but also provide valuable insights into the transition between C_(3)and C_(4)photosynthesis,offering promising avenues for crop improvement and breeding.
文摘The removal efficiency of Cu and Zn from swine wastewater was evaluated as effected by three variables: the hydraulic retention time (HRT) (24, 48, 72 and 96 hours), two different plant species (Typha domingensis Pers. and Eleocharis cellulosa) and two different sizes of filter media (5 and 15 mm) using a horizontal sub-surface flow constructed wetland. From the results, a significant difference was observed in the removal efficiency of Cu and Zn with respect to different hydraulic retention times. The best results were obtained in the HRT of 96 hours for Zn where 96% removal of Zn with Typha domingensis Pers. specie with gravel of 15 mm (experimental unit 6) was achieved. For Cu, at 72 hours of HRT, the efficiency was nearly 100% in five of the six study units (1, 2, 3, 5 and 6). In contrast, in experimental unit 4 with gravel of 15 mm and without plants, only 86% Cu removal was achieved.
基金supported by the Modern Agricultural Industry Technology System of Jiangsu(JATS[2018]156)
文摘Water chestnut(Eleocharis dulcis)is widely cultivated in many countries for its edible and starchy corms.In this study,starches were separated from Guangxi biqi,Hubei biqi and Anhui biqi,and the morphological and physicochemical characteristics of the starches were systematically investigated.There were significant differences in granule size,total starch and amylose contents among starches from the three water chestnuts which present similar X-ray diffraction patterns and Fourier transform infrared spectroscopy.The starch of Guangxi biqi exhibited higher swelling power and solubility than that of Hubei biqi and Anhui biqi.Thermal and pasting properties of starch were different among the three water chestnuts.When hydrolyzed by porcine pancreaticα-amylase(PPA),starches from Hubei biqi and Anhui biqi had higher hydrolysis degree.The starches from the three water chestnut varieties differed significantly in morphological and physicochemical properties,and these studies may provide useful information for future exploitation and application of water chestnut starch in food and non-food industries.
