苗期夜间低温对番茄叶片气孔开张度日变化及叶片超微结构的影响

以15℃夜温为对照,研究了6℃夜间低温对番茄叶片气孔开张度日变化及叶片结构的影响。结果表明:处理7d时,处理植株叶片气孔器大小和叶面积显著小于对照,气孔密度显著大于对照。表皮厚度极显著大于对照。叶片厚度大于对照,但与对照差异不显著。处理植株番茄叶片气孔张开程度一天中皆小于对照,气孔张开率上午与对照差异不显著,14:00显著小于对照。16:00极显著小于对照;恢复7d时,夜低温处理番茄叶片气孔器显著大于对照。气孔密度、每叶气孔数及单叶叶面积、气孔张开率皆小于对照,叶片气孔开口程度、叶片表皮厚度及厚度大于对照,但差异都不显著;夜间低温处理后叶片栅栏组织显得更紧密,恢复7d后无显著差异。

Effects of Low Night rRmperature on the Diurnal Changes of Stomatal Qpening Extent and Ultrastructure of Tomato Leaves

Effects of low night temperature at 6℃(15℃as control)on the diurnal changes of stomatal opening extent and the structures of tomato leaves were investigated.The results showed that on the 7th day of the treatment,the stomatal size and leaf area were significantly lower than control,while the stomatal density and leaf epidermal height were obviously higher than control.Leaf thickness was not significantly affected.During the whole day,the stomatal opening extent in low night temperature treatment was lower than control.The stomatal opening ratio was similar to the control in the morning,while it was lower than control at 14:00 and significantly lower at 16:00.After recovery for 7 days,the stomata size in the low temperature treatment was much bigger than control.The stomatal density,stomatal opening rate,leaf area were lower than control,and the stomatal opening extent,leaf epidermal height and leaf thickness were higher than control.However,these changes were not significant.In the low temperature treatment,the palisade tissue became closer,while no obvious difference was observed after recovered for 7 days.