四个籼型水稻雄性不育系春季在海南岛开花动态的研究

HA Study on Flowering Characteristics of FourCMS Lines in Indica Rice in Spring in Hainan Island

1996年3月在海南岛研究了4个籼型水稻雄性不育系各5个主茎穗和其5个单株全部穗子逐日开花动态及1天中各时段开花动态。研究表明：四个籼型不育系主茎穗始花1～2天后进入盛花，盛花持续2～3天，单株全部穗子开花2～3天后进入当日开花率达10％以上的时期，该时期持续4～5天；在每天开花中，无论主茎穗还是单株全部穗子，四个籼型不育系午后花率占多数，始花到终花历时6～8小时，每日盛花高峰在12：00～14：00时，盛花时段即盛花开始到盛花结束为11：00～16：00时。

Four cytoplasmic male sterility(CMS) lines in indica rice (Oryza sativa subsp. hsien Ting)were used to studythe flowering characterstics of 5 main panicles and all panicles of the 5 plants respectively in Hainan Island in March1996. The results were as follow: one or two days after beginning flowering, the main panicles of all the 4 CMSlines got into their flowering peak, and lasted 2 or 3 days. Two or three days after beginning flowering, all panic1esof each plant flowered at a rate of more than 10% everyday for 4 or 5 days. Both in main panicles and in all paniclesof the 4 CMS lines, most spike1et opened afternoons. With in a day, from beginning to end of flowering, the 4CMS lines lasted 6 to 8hours with a peak time of spikelet opening at 12: 00 to 14: 00. From beginning to end offlowering peak, the 4 CMS lines were at 11: 00 to 16: 00.