The study comparatively examined the leaf photosynthetic capacities of different adzuki bean cultivars, high-yield 2000-75 and Jihong 9218, and low-yield Hongbao 1 and Wanxuan 1 from flowering to ripening. It showed t...The study comparatively examined the leaf photosynthetic capacities of different adzuki bean cultivars, high-yield 2000-75 and Jihong 9218, and low-yield Hongbao 1 and Wanxuan 1 from flowering to ripening. It showed that after flowering, the leaves of the cultivars gradually aged, the leaf chlorophyll （Chl.）, soluble protein （SP） contents, net photosynthetic rates （Pn）, transpiration rates （Tr） and stomatal conductance （G） of the cultivars tended to decline, but the leaf intercellular CO2 concentration （Ci） of the cultivars tended to rise. The leaf photosynthetic capacities of the cultivars decreased gradually from the lower to the upper nodes. The dry seed yields of the cultivars were positively correlated with their leaf Chl., SP, Pn, and Tr and Gs, and negatively associated with their leaf Ci. At the late growth stages, the high-yield cultivars maintained higher leaf Chl. contents, SP contents, Pn, Tr, and Gs than the low-yield cultivars, indicating that leaf photosynthetic capacity was one of important yield-affecting factors of adzuki bean. Therefore, it was important for a crop at the crucial stage of yield formation to maintain a high leaf chlorophyll content and a high leaf photosynthetic capacity and delay leaf aging.展开更多
Foxtail millet(Setaria italica L.)with high drought resistance,is grown widely in arid and semi-arid regions of the world,and it is a new model plant for genetic and molecular studies.To uncover the molecular mechanis...Foxtail millet(Setaria italica L.)with high drought resistance,is grown widely in arid and semi-arid regions of the world,and it is a new model plant for genetic and molecular studies.To uncover the molecular mechanisms of stress-tolerance in different genotypes of foxtail millet,physiological analyses combined with transcriptional profiling were conducted using a time-course analysis on two foxtail millet genotypes Damaomao(DM)and Hongnian(HN).The genotype DM performed better than HN under water deficiency,with more moderate relative water content(RWC)and chlorophyll decline.Further physiological and RNA-seq investigations revealed that the two genotypes possessed high conservatism in some vital biological pathways which respond to drought stress,involving hormone synthesis,proline,and soluble sugar synthesis,and reactive oxygen species(ROS)metabolism.However,some genes related to these pathways showed different expression profiles.Likewise,the lower malondialdehyde(MDA)content in HN than DM may be explained by the observation that HN contained more activated genes in the ascorbate-glutathione cycle using KEGG pathway analysis.Overall,abscisic acid(ABA)response genes,ROS scavengers which were probably involved in signaling responses,a set of enzymes involved in proline and soluble sugar synthesis,channel protein genes,and transcription factors,encompassed the early strategy of foxtail millet response to drought.These findings provide a comprehensive molecular view of how different foxtail millet genotypes respond to short-term osmotic stress.展开更多
基金Supported by National Natural Science Foundation of China （60721062） and National High Technology Research and Development Program of China （863 Program） （2006AA04Z182）
基金the Special Fund for Agro-Scientific Research in the Public Interest, China (200903007)the Cyrus Tang Specific Plant Genetics and Breeding Program of the Northwest A&F University, China (No. 50)
文摘The study comparatively examined the leaf photosynthetic capacities of different adzuki bean cultivars, high-yield 2000-75 and Jihong 9218, and low-yield Hongbao 1 and Wanxuan 1 from flowering to ripening. It showed that after flowering, the leaves of the cultivars gradually aged, the leaf chlorophyll （Chl.）, soluble protein （SP） contents, net photosynthetic rates （Pn）, transpiration rates （Tr） and stomatal conductance （G） of the cultivars tended to decline, but the leaf intercellular CO2 concentration （Ci） of the cultivars tended to rise. The leaf photosynthetic capacities of the cultivars decreased gradually from the lower to the upper nodes. The dry seed yields of the cultivars were positively correlated with their leaf Chl., SP, Pn, and Tr and Gs, and negatively associated with their leaf Ci. At the late growth stages, the high-yield cultivars maintained higher leaf Chl. contents, SP contents, Pn, Tr, and Gs than the low-yield cultivars, indicating that leaf photosynthetic capacity was one of important yield-affecting factors of adzuki bean. Therefore, it was important for a crop at the crucial stage of yield formation to maintain a high leaf chlorophyll content and a high leaf photosynthetic capacity and delay leaf aging.
基金Supported by National High Technology Research and Development Program of China（863 Program）（2009AA04Z139） National Natural Science Foundation of China（60904011）+1 种基金 Natural Science Foundation of Zhejiang Province（Y1090834） Science Foundation of Zhejiang Sci-Tech University（ZSTU0803817-Y）
基金supported by the earmarked fund for China Agriculture Research System (CARS-06-13.5-A26)the National Natural Science Foundation of China (31371529)the Minor Grain Crops Research and Development System of Shaanxi Province, China (2014–2017)
文摘Foxtail millet(Setaria italica L.)with high drought resistance,is grown widely in arid and semi-arid regions of the world,and it is a new model plant for genetic and molecular studies.To uncover the molecular mechanisms of stress-tolerance in different genotypes of foxtail millet,physiological analyses combined with transcriptional profiling were conducted using a time-course analysis on two foxtail millet genotypes Damaomao(DM)and Hongnian(HN).The genotype DM performed better than HN under water deficiency,with more moderate relative water content(RWC)and chlorophyll decline.Further physiological and RNA-seq investigations revealed that the two genotypes possessed high conservatism in some vital biological pathways which respond to drought stress,involving hormone synthesis,proline,and soluble sugar synthesis,and reactive oxygen species(ROS)metabolism.However,some genes related to these pathways showed different expression profiles.Likewise,the lower malondialdehyde(MDA)content in HN than DM may be explained by the observation that HN contained more activated genes in the ascorbate-glutathione cycle using KEGG pathway analysis.Overall,abscisic acid(ABA)response genes,ROS scavengers which were probably involved in signaling responses,a set of enzymes involved in proline and soluble sugar synthesis,channel protein genes,and transcription factors,encompassed the early strategy of foxtail millet response to drought.These findings provide a comprehensive molecular view of how different foxtail millet genotypes respond to short-term osmotic stress.
