育性敏感期低温对水稻光温敏不育系生理指标的影响

摘要

利用生产上常用的5个水稻光温敏不育系材料，在育性敏感期置于人工气候室内进行低温处理，分析低温对供试材料生理指标的影响以及耐冷性差异与生理指标变化之间的联系。低温设置为17．5℃、10 d，对照为21℃、10 d的可育温度，考察处理5，10 d以及返回大田生长5 d时的生理变化指标。结果表明，相比不耐冷的不育系，耐冷型不育系在低温处理前期SPAD值与对照相比变化不显著，SOD、POD活性略有增强，MDA含量、相对电导率有所增加；随着处理时间的延长，SPAD值、Pn值、Tr值、SOD、POD活性均开始下降，但下降幅度较不耐冷的小，MDA含量、相对电导率的持续增加也要慢于不耐冷不育系。%Using five photo thermo sensitive genic male sterile ( PTGMS) lines widely used in the production as experimental materials ,a growth chamber experiment was conducted to analysis physiological characteristics of these lines and ascertain the intrinsic physiological index of the cold-tolerant lines under the effects of low temperature stress of different duration .The 17.5℃,10 d treated plants as cold treated materials ,the 21℃,10 d fertile treated plants as control materials ,the physiological indexes were investigated in the stage of the fifth ,the tenth day of treat-ment and the fifth day of transplanting to field ,respectively .The results showed that in the early days of cold treated stage,comparing the cold-sensitive sterile lines ,the SPAD values of cold-tolerant lines had no significant chang , SOD,POD activity had slight enhancement ,MDA and relative conductivity values increased slightly .But after a long time of cold treatment,SPAD,Pn,Tr,SOD,POD values of cold-tolerant lines decreased gradually,MDA and relative conductivity values increased gradually ,but these changes were lower than those of cold-sensitive lines .