草业科学2017，Vol.34Issue(9)：1880-1888,9.DOI:10.11829/j.issn.1001-0629.2016-0588
干旱胁迫对4种决明属植物光合作用和叶绿素荧光特性的影响
Effect of drought stress on characteristics of photosynthesis and chlorophyll fluorescence of four species of Cassia
摘要
Abstract
The effects of drought stress on the characteristics of photosynthesis and chlorophyll fluorescence of four species of Cassia were studied by conducting a water control experiment (mild drought,severe drought,and normal irrigation) using four Cassia species (C.obtusi folia,C.occidentalis,C.corymbosa,C.bicapsularis).The results showed that 1) drought stress resulted in a decline in the chlorophyll content in all four species of Cassia,and the stress degree of C.occidentalis was the lowest,meaning that C.occidentalis maintains the highest photosynthetic capacity under low moisture conditions.The chlorophyll content of C.corymbosa was the highest in all three treatments,indicating that the light energy absorption and transformation capacity of C.corymbosa are stronger than those of the other three species.2) Drought stress resulted in all four species of Cassia displaying reduced stomatal conductance (Gs),while the stomatal limitation (Ls) value increased,which was accompanied by a decrease in intercellular CO2 concentration (Ci) and a decline in the rate of photosynthesis (Pn),indicating that drought stress affects stomatal factors.The exception to this was C.obtusifolia,which showed an increase in Ci and decrease in Ls,indicating that the results are because of non-stomatal factors.Under drought stress,C.occidentalis showed a higher photosynthetic rate,and C.corymbosa showed a relatively high degree of stomatal opening.3) Drought stress led to a decrease in Fm and Fv/Fm,and an increase in Fo among the four species of Cassia,indicating that damage to photosystem Ⅱ (PSⅡ) or heat dissipation.The qP and ETR values decreased,while the NPQ value increased,indicating damage to PS Ⅱ by drought stress,but effectively avoiding or reducing photoinhibition and light oxidation,which is caused by PS Ⅱ absorbing excess light energy.C.occidentalis showed the most stable performance,which means that C.occidentalis has a higher drought resistance关键词
决明属/干旱胁迫/叶绿素/光合特性/叶绿素荧光Key words
Cassia/drought stress/chlorophyll/photosynthetic characteristics/chlorophyll fluorescence分类
生物科学引用本文复制引用
姚春娟,郭圣茂,马英超,赖晓莲,杨肖华..干旱胁迫对4种决明属植物光合作用和叶绿素荧光特性的影响[J].草业科学,2017,34(9):1880-1888,9.基金项目
中央财政林业科技推广示范资金项目——湿加松良种试验推广及植被恢复技术示范(JXTG[2013]11号) （JXTG[2013]11号）
江西省科技支撑计划项目——赣南稀土矿废弃地生态经济植被恢复模式研究(20133BBF60012) （20133BBF60012）
江西省教育厅科技项目——赣南废弃稀土矿区生态恢复关键技术研究(GJJ13279) （GJJ13279）
