东乡野生稻苗期和穗期的耐寒性研究

东乡野生稻苗期和抽穗开花期的耐寒性表现：比粳稻耐寒性强，尤其苗期耐寒性特强，耐寒性高１个等级。抽穗开花期在连续３ｄ自然低温（１６．９℃、１４．９℃、１６℃的日平均温度），结实率达７０％以上。抽穗结实时间直至１０月３１日，平均结实率２．５％。比籼粳稻耐寒品种结实期长６ｄ左右，但抽穗能结实正常时期与籼粳稻耐寒品种相似。

Study on the Cold Tolerance of Dongxiang Wild Rice at Stage of Seedling and Heading

This study showed that the cold tolerance of Dongxiang Wild Rice at seedlingstage was one scale more than that of Japonica rice. Within successive three days of mean temper-ature as low as l6. 9℃ and l6℃ during the period of heading,the seed-setting rate remainedover 70%. It could flower and head until the end of October,with a mean setting rate of2.5%。The results revealed that the period of heading and setting for Dongxiang Wild Rice was about 6days longer,respectively,than some cold- tolerant Indica and Japonica varieties,while their nor-mal heading and setting stages approximated.