【摘要】 从国际水稻研究所种质库取得50个水稻品种,其中包括粳型品种12个,釉稻18个,爪哇型品种10个,釉×粳杂种3个,以及野生稻7个。在芽期、苗期、移栽期、孕穗期、开花期,进行了耐冷性的测定。结果指出,在不同的水稻类型中,其耐冷性的次序为:粳稻>爪哇型>秈稻>野生稻。从本实验所采用的有限量的品种来看,在苗期粳型品种的耐冷性比其它类型好;在开花期某些爪哇型品种比粳型品种好;在芽期和苗期之间,以及在芽期和开花期之间,其耐冷性有明显的正相关。在其它时期之间未找到这种相关性。这指出,在特殊地区的低温发生时期的一定生育阶段中,进行筛选是必要的。更多还原

【Abstract】 Cold injury which influence riee production in different rice growing countries oc- curs at various growth stages.The degree of cold injury depends on the air or water temperature,the cropping pattern,the growth stage of the rice and other factors.It is generally aeeepted that cold tolerance of rice at one stage is different from another stage.However,Okabe and Toriyama reported that varieties seem to respond simi- larly to cold temperature at different growth stages.Some varieties have been found to be tolerant at different growth stages. The purpose of this experiment is to find whether cold tolerance scores at different growth stages of different kinds of riee are correlated or not.更多还原