籼稻早熟突变类型及其性状相关性的研究

EARLY MATURING MUTANITS IN INDICA RICE AND THEIR TRAITS

对迟熟中籼ＩＲ１５２９６８３２的５０个早熟突变系进行分类，并应用相关和回归分析方法，研究了迟熟品种的早熟突变系的１１个农艺性状之间的相互关系和遗传参数，以及这些性状对熟期的影响。结果表明：１早熟突变系可分为早熟中稻和中熟中稻两种生态遗传类型。２早熟突变体的抽穗期与千粒重呈极显著负相关。３与早熟突变体抽穗期关系密切的性状，按直接作用大小顺序排为：千粒重＞株高＞不实率。４早熟突变体的株高、千粒重和生育期有较高的广义遗传力。

The correlation and genetic parameters of eleven agronomic characters of 50 early mature lines induced from late mature cultivar,IR 1529 68 3 2 were studied by morphological classification and correlation and regression analysis.The results showed that: 1 The early mutants could be divided into two ecotype:early mature type and medium mature type of mid maturity rice.2 The 1000 grain weight of early mutants negatively correlated with the length of growing period.3 According to direct path coefficients,the relation with heading period of early mutants was in order of 1000 grain weight >plant height >seed sterility.4 The higher heritability in broad sense were found in plant height,1000 grain weight and heading period of the early mutants.