摘要
干旱胁迫使冬小麦可变荧光与最大荧光比(F_v/F_m)、可变荧光与最小荧光比(F_v/F_o)、稳态荧光(F_t)、初始荧光到最大荧光1/2点的时间(T_(1/2))均明显降低,表明干旱胁迫使冬小麦叶片光系统Ⅱ(PSⅡ)质子醌库(PQ库)容量变小,光系统Ⅱ原初光能转换效率、光系统Ⅱ潜在活性受到抑制,干旱胁迫直接影响了光合作用的电子传递和CO_2同化过程。
Effects of drought stress on chlorophyll fluorescence of winter wheat show that T1/2 [ the time in ms from the point of variable fluorescence ( Fo) to the point on the rising curve corresponding to half maximal fluorescence (Fv) ], Fv/Fm (the ratio of the variable to maximal fluorescence), Fv/Fo(the ratio of the variable to minimal fluorescence), and Ft (steady fluorescence) under drought stress condition are evidently lower than those under non-water stress condition. The capacity of PQ store of photosystem II is condensed, and the efficiency of primary light energy conversion of photosystem II and the potential activities of PS II decrease under drought stress condition. This implies the inhibition of photosynthetic electron transportation and carbon assimilation under drought stress.
出处
《中国生态农业学报》
CAS
CSCD
2002年第4期13-15,共3页
Chinese Journal of Eco-Agriculture
基金
河北省院士节水项目
国家重大自然科学基金项目(49890330)
中国科学院石家庄农业现代化研究所所长择优基金
国家重点基础发展(973)规划项目(G2000077905)共同资助
关键词
干旱胁迫
冬小麦
叶绿素荧光
影响
Chlorophyll fluorescence, Winter wheat, Drought stress
