关键词: 水稻, 育性, 生态学, 适应性, 光温敏核不育

Abstract: It has gradually become obvious that the fertility alteration of photo-sensitive genic male-sterile rice (PGMR) is simultaneously regulated by both photoperiod and temperature, and there exists a temperature range of photoperiod sensitivity, only within which is the pollen fertility alteration of PGMR regulated by photoperiod. And results suggested that the stage from secondary rachis-branch and spikelet primordia differentiation to pollen mother cell formation in the process of panicle development is the photoperiod sensitive stage of fertility alteration induced. During this stage, long-day conditions induce pollen sterility and short-day conditions induce its fertility under a certain temperature regime. The critical light length is 13.75-14.00 h/d and critical light intensity is 5-50 lux in Nongken 58S. The twilight can affect the inducement of fertility, too. The induction stage of thermo-sensitivity of fertility alteration are different between PGMR and thermosensitive male-sterile rice (TGMR). During this stage, lower temperature conditions cause pollen fertility and high temperaure conditions cause it sterility. The critical values vary as the gene transfered into different varieties. According to the results, the current sterile lines fall into 4 photo-thermo-types. The adaptabilities of them are different.

Key words: Ecological adaptability, Fertility alteration, Photo-thermo-reaction model, Photo-sensitive genic male sterile rice