强光对番茄低温弱光胁迫后不同叶片恢复的影响

Effect of high light on recovery after chilling underlow light in different tomato leaves

5℃低温弱光(60μmol·m-2·s-1)处理3d导致番茄叶片Pn、Fv/Fm、ΦPSⅡ的下降,但F0并没有变化;强光(800μmol·m-2·s-1),25℃条件恢复5h,番茄成熟叶片Pn、Fv/Fm基本能得到恢复,ΦPSⅡ则略有下降;而成长叶片Fv/Fm以及ΦPSⅡ却显著下降,F0也明显增加.恢复3d后成熟叶光合作用、叶绿素荧光参数完全得到恢复,而成长叶虽稍有恢复但仍保持较低水平.

Exposure of tomato plants to chilling 5℃ under low light (60μmol·m-2·s-1)decreased Pn,Fv/Fm,ΦPSⅡ,but not affect F0.Recovered 5h under high light 800μmol·m-2·s-1 and 25℃,Pn and Fv/Fm of developed leaves recovered in great degree,but slightly decreased ΦPSⅡ. However,Fv/Fm and ΦPSⅡ of developing leaves decreased rapidly.Recovered 3d,Pn,Fv/Fm,ΦPSⅡ of developed leaves arose to a value similar to control,but recovered slowly for developing leaves.