棉花学报2011，Vol.23Issue(2)：106-112,7.
三个不同耐高温棉花品系的光合特性及对盛花期高温胁迫的响应
Leaf Photosynthetic Characteristics and Response to High Temperature Stress at Peak Flowering Stage among Three Cotton Lines with Different Tolerance to High Temperature
摘要
Abstract
The leaf photosynthetic characteristics and their response to high temperature stress at peak flowering stage were analyzed comparatively among three cotton lines with different high-temperature tolerance in the paper.The results showed that the tolerant line HLY had significant higher net photosynthetic rate(Pn), water use efficiency(WUE), maximum net photosynthetic rate(Pmax), and apparent quantum yield, also had lower light compensation point(LCP) and larger light saturation point(LSP) as compared with those of the sensitive lines XYM 68 and TS 18 from peak squaring to boll-setting stage, but the stomatal conductance(Gs), intercellular CO2 concentration(Ci), transpiration rate(Tr), and stomatal limitation(Ls) did not differ significantly among the three cotton lines.High temperature stress at peak flowering stage caused a decline in Pn, Gs and WUE, and an increase in Tr and Ls, but did not affect Ci The Pn in XYM 68 and TS 18, but not in HLY, reduced significantly after being stressed.The decrease of Gs was higher, whereas the increase of Tr was lower in XYM 68 and TS 18 than those in HLY.The maximum photochemical efficiency of photosystem Ⅱ(Fv/Fm), the quantum yield of electron transport(Φps Ⅱ), and the photochemical quenching co-efficient(qP) reduced, and accompanied by an increase in the non-photochemical quenching co-efficient(NPQ) under high temperature stress at peak flowering stage.Among the three cotton lines, the Fv/Fm in TS 18 declined dramatically, the reduction of ΦpsⅡ and qP was higher, and the increase of NPQ was significantly lower in XYM 68 and TS 18 than those in HLY.关键词
棉花/高温耐性/光合特性/叶绿素荧光Key words
cotton/ high temperature tolerance/ photosynthetic characteristics/ chlorophyll fluorescence分类
农业科技引用本文复制引用
熊格生,袁小玲,贺彭毅,田东洋,葛瑞华,刘志..三个不同耐高温棉花品系的光合特性及对盛花期高温胁迫的响应[J].棉花学报,2011,23(2):106-112,7.基金项目
国家自然科学基金项目(30900909) （30900909）
湖南省教育厅优秀青年科研项目(08B033) （08B033）
湖南省科技计划项目(2009NK3101) （2009NK3101）
