双季早稻淦鑫203乳熟初期高温处理后叶片某些生理特性的动态变化

Effects of High Temperature on the Dynamic Changes in Some Physiological Characteristics of the Leaves in Early Season Rice Ganxin 203 at the Early Milk Stage

以双季早稻超级稻淦鑫203为材料,设置34,36,38℃3个高温胁迫强度,1～5 d胁迫持续时间,于乳熟初期放入人工气候箱中进行高温处理,以同期田间自然温度为对照,研究了稻株倒二叶叶绿素含量、剑叶可溶性糖及可溶性蛋白质含量的变化。结果表明,淦鑫203在乳熟初期高温处理后,倒二叶叶绿素含量呈现先迅速升高后缓慢降低的特点,处理温度越高,天数越多,处理与对照间差异幅度越大;高温处理4 d后叶绿素含量恢复到对照水平。36℃和38℃高温1～2 d处理9 d后叶绿素含量较对照大幅降低,3～4 d处理6 d后叶绿素含量大幅降低。与对照相比,淦鑫203高温处理后剑叶中可溶性糖及可溶性蛋白质含量呈下降趋势,但可溶性糖及可溶性蛋白质含量胁迫指数均呈上升趋势。

The effects of high temperature stress on chlorophyll content in the second upper leaves and soluble sugar, protein content in the flag leaves of early season super-rice Ganxin 203 at the early milk stage were studied. The experiment was designed with three high temperature gradients （34 ℃ ,36 ℃ and 38 ℃ ） and 1 to 5 running days in the plant growth cabinet. The natural temperature was taken as the control. The results showed that the chlorophyll content in the second upper leaves under high temperature stress increased rapidly, then it decreased slowly. The amplitude of variation of chlorophyll contents between treatment and CK got larger gradually along with bulid-up of the stress temperature and prolongation of stress time. The chlorophyllcontent recovered to the control level after high temperature treatment 4 d. The chlorophyll content of 36℃ and 38 ℃ high temperature treatment 1 -2 d after 9 d decreased significantly compared with CK, while high temperature treatment 3 ～ 4 d was 6 d. Compared with CK, the soluble sugar and protein content in the flag leaves of Ganxin 203 showed a down was trend after high temperature treatment, but the stress index of soluble sugar and protein content was on the rise.