摘要
持续常温弱光(25℃/18℃,100μmol m-2s-1)、低温弱光(12℃/12℃,100μmol m-2 s-1和7℃/7℃,100μmolm-2s-1)均导致黄瓜生长减慢或停滞、叶绿素含量、气孔导度和净光合速率、光合电子传递速率下降以及胞间CO2浓度上升。常温弱光和12℃弱光处理对光系统Ⅱ的最大光化学效率Fv/Rm无显著影响,而7℃弱光处理导致Fv/Fm的可逆性下降。常温弱光和7℃、12℃弱光处理均导致了光化学反应速率的降低以及天线热耗散和反应中心过剩能量的增加。在胁迫后,12℃弱光0比7℃弱光更有利于植株光合功能的恢复。
Exposure of cucumber plants to low light (25°C/18°C,100 μmol m-2s-1) and low temperature (12°C/12°C,100 μmol m-2s-1;7°C/7°C, 100 μmol m-2s-1) resulted in a retardation or complete inhibition of plant growth (Fig.1), decreases in chlorophyll content (Table 1), net pho-tosynthetic rate, stomatal conductance and pho-tosynthetic electron transport rate, but an increase in intracellular CO2 concentration (Figs. 2, 5). Significant reversible reduction in Fv/Fm was found in plants after chilling at 7°C, but not in those after chilling at 12°C (Fig.4 ). Chilling and low light treatment resulted in a decrease in chlorophyll content, followed by a decreased al- location of photons absorbed by PSII antenna to the photosynthetic electron transport and an increased allocation of thermal dissipation and excessive energy (Tables 1,2). Plant chilled at 12°C showed higher recovery capacity than those chilled at 7°C upon returning to normal conditions.
出处
《植物生理与分子生物学学报》
CAS
CSCD
2004年第2期153-160,共8页
Journal Of Plant Physiology and Molecular Biology
基金
国家自然科学基金重点和面上项目(30230250
30070522)
863项目(2001AA247031)
教育部优秀青年教学科研奖励计划基金
浙江省青年人才培养专项基金项目资助
关键词
低温
弱光
光合作用
叶绿素荧光猝灭
吸收光能分配
chilling
low light
photosynthesis
chlorophyll fluorescence quenching
absorbed light allocation
