【摘要】 干旱胁迫下蔗叶荧光参数Ｆｖ／Ｆｍ、 Ｆｖ／Ｆｏ、△ Ｆｖ／Ｆｔ、Ｔ１／２均明显降低，表明干旱胁迫使蔗叶光系统Ⅱ（ＰＳⅡ）原初光能转换效率、ＰＳⅡ潜在活性、潜在光合作用活力受到抑制；研究还表明干旱胁迫下蔗叶荣光淬灭（△Ｆｖ值）减慢，可变荧光淬灭速率（△Ｐｖ／Ｆｏ）和光合量子产额（Ｙｉｅｌｄ）降低，说明干旱胁迫直接影响了光合作用的电子传递和二氧化碳同化过程。更多还原

【Abstract】 The decrease of Fv/Fm (the ratio of the variable to maximal fluorescence), Fv /Fo(the ratio of the variable to minimal fluorescence), T1/2(the time in ms from the point Fo to the point on the rising curve corresponding to 1/2 Fv), △Fv/Ft suggested that the efficiency of primary light energy conversion of photosystem Ⅱ (PSⅡ ), the potential activities of PS Ⅱand the potential photosynthetic activities, ere decreased under drought stress. The decrease of variable fluorescence quenching (△Fv values ), variable fluorescence quenching rate (△Fv/Fo values) and quantum yield of photosynthesis (Yield=Fds/Fms) also implied the inhibition of photosynthetic electron transport and the carbon assimilation when the leaves exposed to drought stress.更多还原