水稻光敏感雄性不育临界日长及其对环境因子反应的初步研究

A Preliminary Study on the Critical-Daylength Evoking the Photoperiodic Sensitive Male Sterility of Rice and Their Responses to Other Environmental Factors

水稻光敏感雄性不育的临界日长包括:可诱导显著雄性败育的最小的日照时数(简称“诱导临界日长”)和导致雄性近似于完全败育的日长(简称“败育临界日长”)。“诱导”与“败育”两个临界日长值间有约1小时的间隔。而且它们随栽培环境中除日长外的其它因子的波动而变化。经对在4种不同环境下测得的败育度—日照时数变异的统计分析,证明日长处理期间日最高(或最低)汽温的平均值差异可对光敏感雄性不育性表现程度产生显著影响;揭示出“日长×环境温度”的互作效应。作者认为,此两种效应的同时存在导致了光敏感雄性不育临界日长值的变异。

The study revealed that there were two different critical-daylength values evoking thephotoperiodic sensitive male sterility of rice.One of them was the minimum daylengthcausing evident abortion,while the other was that leading to nearly complete male sterility.There was a discrepancy of about 1 hour between the two.However,these values arenot static;They varied noticeably with the fluctuation of other environmental factors.Through the statistical analysis of the results of the sterility-daylength complexes obtained under 4 different environments,it was found that the expression of thephotoperiodic sensitive male sterility could be altered significantly by changes of the meandaily maximum(or minimum)temperature during the period of daylength treatment aswell as the interaction of daylength×temperature.It was considered that the effects ofboth of these were the main reasons leading to variation of the critical daylength of thephotoperiodic sensitive male sterility of rice.