水稻生育期 (从播种到抽穗的天数 )是影响水稻生长和品种布局的一个重要因素 ,它既受品种的遗传特性控制又受光、温、水、肥等生长条件的影响。为选育适用于一定生态环境和耕作制度的水稻品种 ,生育期是一个需要经常改良的性状。已报道的影响水稻生育期的基因达十多个 ,其中 4? Rice growth period (from sowing to heading) is an important factor affecting the rice growth and variety distribution. It is affected by the genetic characteristics of varieties and the growth conditions such as light, temperature, water and fertilizer. To breed rice varieties suitable for certain ecological environment and tillage system, the growth period is a trait that needs to be improved frequently. Already reported more than a dozen genes that affect rice growth, of which 4?