水稻在一定的自然环境中,其幼穗原始体的形成、花芽的分化以及抽穗所需生育期的长短,依当时气温和光照时间而異。气温对抽穗期影响的大小,称为感温性的强弱。光照时间影响的大小,称为感光性的强弱。由此观点可引导出下列重要假说,即在一定地区的抽穗期,是由品种的感光性和感温性两个生育反应以及不受其影响的“基本营养生长性”等三个特性所决定的(柿崎,和田,松尾等)。因此,品种感光性和感温性愈强,则抽穗期受日照时间和气温的影响程度愈大,故而可以认为其抽穗期依地区的不同而有大的变黑。例如在低纬度地方栽培高纬度地方的品种时其成熟期有逆转的现象,而在高纬度地方利用高温短光照栽培可使抽穗期提前,这些事实可以证明上述观点是恰当的。 Rice in a certain natural environment, the formation of young spike primordia, flower bud differentiation and heading required growth period length, depending on the prevailing temperature and light time vary. The impact of temperature on the size of the heading, known as the temperature of the strength. Light size of the impact of time, known as the strength of light. From this point of view can lead to the following important hypothesis that the heading date in a certain area is determined by the three sensitivities and temperature sensitivity of the two reproductive responses and the “basic vegetative growth” that is unaffected by them (Kakizaki, Wada, Matsuo, etc.). Therefore, the stronger varieties of light sensitivity and temperature, the heading time by the sunshine time and the greater the extent of temperature, it can be considered that the heading date according to different regions have a large black. For example, the cultivation of cultivars at high latitudes in low latitudes reverses their maturation stage, whereas the use of high-temperature and short-light cultivation at high latitudes can lead to a higher heading date. This fact proves appropriate.