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Tracking the expression of photosensitive genic male sterility genes in rice

机译：跟踪水稻光敏性雄性不育基因的表达

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Photoperiod sensitive genic male sterile rice lines contain genes that induce complete sterility in high temperature and long day light length period, and revert to fertility in optimum low temperature and short day light length period. These lines are good candidates for hybrid rice seed production. The main challenge limiting their use in production of hybrid rice seeds is that of determining the exact time of their growth period when sterility gene(s) is expressed. The objective of this study was to determine the time in the rice growth period when the sterility gene(s) are expressed. Rice line ZAU11S106, a photoperiod sensitive genic male sterile line was used to test the hypothesis: it is possible to estimate time within ±2 days when photosensitive genic male sterility (PGMS) gene is expressed. Sowing was done in 9 rows in Hangzhou, China in the month of May and matured in August when day light length was over 14 h and day temperatures were over 30°C. ?At 57 days, old plants in row 1 were given short day length treatment and after every four days, the next row was included in the treatment. This was done until plants in row 1 flowered when the treatment was stopped. Plants given short day length treatment at 73 and 77 days old realized 6 and 0% seed set, respectively.? At 73 and 77 days old, plants were at dyad and tetrad stages of pollen development, respectively. The conclusion was that, the sterility gene was expressed between the dyad and tetrad stage of pollen development.
机译：光周期敏感的基因型雄性不育水稻系包含的基因可在高温和长日照长周期内诱导完全不育，并在最佳的低温和短日照长周期内恢复育性。这些系是杂交水稻种子生产的良好候选者。限制其在杂交水稻种子生产中使用的主要挑战是确定表达不育基因时其生育期的确切时间。这项研究的目的是确定水稻中不育基因表达的时间。水稻系ZAU11S106（一种对光周期敏感的雄性不育系）用于检验这一假设：当表达感光性雄性不育（PGMS）基因时，可以估计在±2天内的时间。 5月在中国杭州分9行播种，8月成熟，白天日照时间超过14小时，日间温度超过30°C。 ？在第57天，对第1行中的老植株进行短日照处理，每四天后，将下一行纳入处理。这样做直到停止处理时第一行的植物开花。在73日和77日龄下接受短日照处理的植物分别获得了6％和0％的结实率。在第73天和第77天时，植物分别处于花粉发育的二倍体和四倍体阶段。结论是，在花粉发育的二倍体和四倍体之间表达了不育基因。

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