两系杂交早稻杂种优势的初步研究

对安农Ｓ－１配制的１１７个杂交早稻组合的杂种优势分析，阐述了两系杂交稻在产量、生育期和经济性状上的优势表现；论述了杂种与父本、杂种产量与产量性状及各产量性状之间的相互关系，提出了在选育两系杂交早稻组合时应注意的一些问题。

Studies on the Heterosis of Two-line Early Hybrid Rice

The heterosis of two-line early hybrid rice was evaluated with 117 crosses of Annong S-1,a thermo-sensitive genic male sterile (TGMS)line ,and indica rice varieties (or lines). The results showed that two - line early hybrid rice combinations expressed yield heterosis and heterobeltiosis on average, some of them expressed standard heterosis; Significant minus heterosis, heterobeltiosis and standard heterosis of growth duration were found; Among the economic characters,panicles per plant and 1000-grain weight pos- sessed most obvious minus standard heterosis; Signifcant positive correlation was found between male parents and F1 hybrid for the main economic traits and between hybrid yield and each yield characters one another.