Cenchrus biflorus called Karangiya in the Hausa language is an annual pastoral grass which is a valuable herbaceous fodder in dry land region in the context of climate change. However, little is known about the plant ...Cenchrus biflorus called Karangiya in the Hausa language is an annual pastoral grass which is a valuable herbaceous fodder in dry land region in the context of climate change. However, little is known about the plant water use under the effects of cut in West Africa Sahel like Niger where the plant is a multipurpose grass species. Therefore, this study investigated the impact of grazing (simulated by shoot cuts) on biomass production. Cenchrus biflorus Roxb was grown on field plots and in pots and subjected to shoot cuts at different levels (3 cm and 5 cm from soil surface). The effect of shoot cuts on drought tolerance was evaluated by assessing the response of transpiration to the diurnal variation of vapor pressure deficit (VPD). Results showed that the biomass production varied in response to shoot cuts depending on the culture system, and the level or frequency of cuts. The mean biomass production increased significantly especially in field plots for 5 cm cuts compared to those at 3 cm and the control treatment. In addition, transpiration was highly increased in response to the VPD increase. Shoot cuts significantly reduced transpiration, whatever the level, largely because they reduced leaf surface. We concluded that moderate grazing (cuts to 5cm) can improve biomass production and allow better adaptation to water deficit as they significantly reduced water loss through transpiration. The study recommends the cropping of the Cenchrus biflorus as climate solution as it performs better under water deficit for improving grazing resilience in Niger.展开更多
This project is to study chemical constituents of Rubus biflorus Buch(Chinese name“Fenzhimei”),isolated by silica gel chromatography and structure determined by spectroscopic.techniques.Two flavones were isolated fr...This project is to study chemical constituents of Rubus biflorus Buch(Chinese name“Fenzhimei”),isolated by silica gel chromatography and structure determined by spectroscopic.techniques.Two flavones were isolated from Rubus bflorus Buch and identified as 8-methyl6-(3"-methylbut-2"-enyl)-5,7-dihydroxy-5'-methoxy-3',4'-methylenedioxy flavone(A)and 8-methyl-5-methoxy 6,7-(2",2"-dimethylpyran)-3',4'-methylenedioxy-5'-(3"-methylbut-2"-enyl)flavone(B),named as fenzhimines A and B,respectively.Compounds A and B are two new flavonoids.展开更多
文摘Cenchrus biflorus called Karangiya in the Hausa language is an annual pastoral grass which is a valuable herbaceous fodder in dry land region in the context of climate change. However, little is known about the plant water use under the effects of cut in West Africa Sahel like Niger where the plant is a multipurpose grass species. Therefore, this study investigated the impact of grazing (simulated by shoot cuts) on biomass production. Cenchrus biflorus Roxb was grown on field plots and in pots and subjected to shoot cuts at different levels (3 cm and 5 cm from soil surface). The effect of shoot cuts on drought tolerance was evaluated by assessing the response of transpiration to the diurnal variation of vapor pressure deficit (VPD). Results showed that the biomass production varied in response to shoot cuts depending on the culture system, and the level or frequency of cuts. The mean biomass production increased significantly especially in field plots for 5 cm cuts compared to those at 3 cm and the control treatment. In addition, transpiration was highly increased in response to the VPD increase. Shoot cuts significantly reduced transpiration, whatever the level, largely because they reduced leaf surface. We concluded that moderate grazing (cuts to 5cm) can improve biomass production and allow better adaptation to water deficit as they significantly reduced water loss through transpiration. The study recommends the cropping of the Cenchrus biflorus as climate solution as it performs better under water deficit for improving grazing resilience in Niger.
文摘This project is to study chemical constituents of Rubus biflorus Buch(Chinese name“Fenzhimei”),isolated by silica gel chromatography and structure determined by spectroscopic.techniques.Two flavones were isolated from Rubus bflorus Buch and identified as 8-methyl6-(3"-methylbut-2"-enyl)-5,7-dihydroxy-5'-methoxy-3',4'-methylenedioxy flavone(A)and 8-methyl-5-methoxy 6,7-(2",2"-dimethylpyran)-3',4'-methylenedioxy-5'-(3"-methylbut-2"-enyl)flavone(B),named as fenzhimines A and B,respectively.Compounds A and B are two new flavonoids.
