不同类型籼粳杂种F1比较研究

A Comparative Study of Different Categories of F_1 Hybrids between Indica and Japonica

按亲本生态型的不同组合方式，配制了６类籼粳杂种，比较了这些杂种的抽穗日数、秆高、单株粒数及其离中优势上的差异，并讨论了在生产上的利用价值。结果表明，中×中杂种生育期最短，茎秆最矮，单株粒数较多，生产利用价值大；早×早和早×中，尤其是早×中杂种单株粒数优势突出；早×晚、中×晚和晚×晚杂种，茎秆高，生育期长，优势不明显。

The study deals with six categories of indica-japonica hybrids which were combined with different parental ecotypes. Among the six categories of hybrids,the medium × medium had the shortest heading duration and shortest culms and bore more grains per plant.The early × early and early × medium. especially the latter, had an outstanding heterosis and bore a good number of grains per plant.But all the eariy×late, medium×late and late×late had longer heading duration and taller culms and showed no heterosis.