【摘要】 <正> 稻穗分化形成期是决定每穗粒数的关键时期之一。准确鉴定稻穗分化过程,对正确掌握稻田中期的肥水管理,调节杂交制种的花期相遇以及确定化学杀雄的适宜喷药时间等,都具有十分重要的意义。探索简捷准确的稻穗分化过程的鉴定方法,一直是引人注意的问题。 松岛省三首先系统而详细地研究了稻穗分化的全部过程,将稻穗分化过程划更多还原

【Abstract】 The relation between the stages of panicle-differentiation and "leaf index" as well as "leaf remainder" in" rice plant were studied in 17 varieties of O. sativa L. subsp, hsien Ting (Indica Kate) and 8 varieties of O. sativa L. subsp. keng Ting (Sinica Chang or Japonica Kate) at Yangzhou in China and Bordo Agricultural Research Center of Guinea in 1972—1979. By the observation of 10, 000 rice plants showed that the panicle—differentiation in rice pIant began when the fourth leaf from the uppermost (boot leaf)was sprouting out, regardless of variety, time and place of cultivation and planting season. There was a synchronous relation between the different stages of the panicle-differentiation and the sprouting of the last three and a half leaves from the uppermost. The "leaf remainder" as a unified criterion used in determining the stages of panicle-differentiation in rice plant is rather superior than that of "leaf index" as it was suited to all the varieties despite the number of their leaves, and also simple and correct in use. The problem on the dividing of the stages of the entire process of panicle-differentiation was also discussed, according to their effects on the formation of the panicle character and the morphological character of the plant.更多还原