两系杂交水稻杂种优势研究 Ⅰ.主要经济性状表现

STUDIES ON THE HETEROSIS OF TWO-LINE HYBRID RICE I. PERFORMANCE OF MAIN AGRONOMIC CHARACTERS

摘要:

本研究观察了18个两系杂交水稻组合在华南地区种植时杂种优势表现。结果表明：三种类型两系杂交组合主要农艺性状优势强弱呈现出籼粳交＞籼爪交＞籼籼交＞三系杂交组合（对照）；同一杂交组合早晚季种植表现差异较大；亚种间杂种优势利用的主要问题是结实率和谷草比比较低。

关键词:两系杂交水稻;杂种优势;农艺性状

Abstract:

Comparative study of agronomic characters in 18 combinations of two-line hybrid rice indicated that the heterosis was shown to be in the order: Indica/Japonica>Indica/ Javanica>Indica/Indica>there-line hybrid rice" Weiyu 64". The same two-line hybrids showed different heterosis performance between early and late season rices. Low seed setting and low grain-straw ratio were the main problems for utilization of indica-Japonica hybrid.

Key words:Two-line hybrid rice;Heterosis;Agronomic character