多胚苗水稻APIV不同颖花的多卵和多胚苗频率研究

APIV的多卵和多胚苗频率与其颖花和种子的发育季节以及颖花的着生部位有一定关系。在夏季条件下抽穗开花，其多卵频率和多胚苗频率均比较低，而在秋季条件下抽穗开花则比较高。在同一稻穗中的多卵和多胚苗频率，强势颖花要明显地高于弱势颖花。在同—季节抽穗开花的主穗和分蘖穗之间，其颖花内的多卵频率不存在明显差异，多胚苗频率的差异也不明显。

Study on Frequencies of Polyeggs and Polyembryo-seedlings in the Different Caryopsis of Apiv Rice

The frequency of polyeggs and polyembryo-seedlings of APIV are to certain extent related to both the developmental season and the site of the spikelet in a panicle. The frequency in summer was higher than that in autumn. In a panicle, the frequencies in the stronger spikelet were higher, but in the weaker ones lower. However, there was no difference in the frequency between the mainpanicles and the tilling-panicles of heading at the same season.