高温对水稻剑叶生长和气孔导度影响

为探讨高温对剑叶生长及气孔导度的影响,采用人工气候箱模拟抽穗期高温,对不同的早稻品种采用不同温度处理。结果表明:(1)在一定温度范围内,温度越高,叶片伸长越长,胜泰1号叶片伸长量最大,籼小占叶片伸长量最小;(2)大气温度升高,叶片温度明显升高,4个品种处理间变化趋势一致,且无显著性差异,叶片温度变化与气温变化一致,叶片温度略低于气温;(3)温度升高,气孔导度明显增加,SPAD值增大,特别是气温从36℃升到38℃时,气孔导度几乎成直线增长,蒸腾作用增强;(4)4个品种中粤香占对高温敏感性较小,耐高温性较强。

Effect of High Temperature Stress on Leaf Growth and Stomatal Conductance in Rice

In this study,different early rice varieties were studied in different temperature treatments,and the effect of high temperature stress on leaf growth and stomatal conductance in rice were probed.The results showed that:(1) in a certain temperature range,the higher the temperature,the longer the leaf elongation.The value of leaf elongation of Shengtai No.1 was the maximum,and that of Xianxiaozhan was the minimum.(2) Leaf temperature increased significantly.The changing trend of four varieties was the same,and leaf temperature was slightly lower than the air temperature.(3) The stomatal conductance and the value of SPAD were increasing,especially when the temperature rose from 36 ℃ to 38 ℃,the stomatal conductance almost grew sharply,and the transpiration strengthened.(4) Yuexiangzhan was less sensitive to high temperature and its heat resistance was stronger.