应用生态学报2011，Vol.22Issue(5)：1195-1200,6.
外源钙对干旱胁迫下烤烟幼苗光系统Ⅱ功能的影响
Effects of exogenous CaCl2 on the functions of flue-cured tobacco seedlings leaf photosystem Ⅱ under drought stress
摘要
Abstract
Taking chlorophyll a fluorescence transient OJIP as the probe, this paper studied the effects of foliar spraying 10 mmol • L-1 of CaCl2 on the functions of photosystem Ⅱ (PS Ⅱ ) in tobacco seedling leaves under drought stress. Drought stress decreased the conversion efficiency of PS Ⅱ primary light energy ( Fv/Fm ) and electron transport rate ( ETR) , and inhibited the primal process of photosynthesis, resulting in an obvious photoinhibition. After the spraying of CaCl2, the decrement of quantum yield for electron transport (φE0) under drought stress was obviously lower, and the increment of electron transport efficiency of per reaction center (ET0/RC) was obviously higher, compared with those after the spraying of water. Foliar spraying CaCl2 increased the amount of PS Ⅱ -captured light energy used for photosynthesis electron transport, the efficiency of surplus active reaction center, as well as the energy transport in electron transport chain, making the PS Ⅱ remain relatively high activity under drought stress, and accordingly, the drought resistance of the tobacco seedlings was improved.关键词
烤烟/外源钙/干旱胁迫/PSⅡ/光抑制分类
农业科技引用本文复制引用
张会慧,张秀丽,许楠,贺国强,金微微,岳冰冰,李鑫,孙广玉..外源钙对干旱胁迫下烤烟幼苗光系统Ⅱ功能的影响[J].应用生态学报,2011,22(5):1195-1200,6.基金项目
国家自然科学基金项目(30771746,31070307)和黑龙江省烟草专卖局项目(2007,2009)资助. （30771746,31070307）
