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稻作冷害是一个国际性的问题 ,尤其是日本、韩国、中国和美国 ;云南省常年受害面积约全省稻作面积的二分之一。云南稻种孕穗开花期耐冷性种质居全国之首 ,而且普遍强于日本品种 [1 ]。水稻耐冷性是多基因控制的数量性状 ;Yano等 (1 997)认为核代换群体和近等基因系群体 (NIL)是
Rice chilling injury is an international problem, especially in Japan, South Korea, China and the United States. The perennial area of damage in Yunnan Province is about one half of that of the province. Cold-resistant germplasm at the booting and flowering stage of Yunnan rice varieties ranks first in the country and is generally stronger than Japanese varieties [1]. Cold tolerance in rice is a quantitative trait controlled by multiple genes. Yano et al. (1997) found that the nuclear substitution population and near-isogenic population (NIL)