籼稻米粒延伸性的遗传研究

采用包括遗传主效应和基因型与环境互作效应的三倍体遗传模型，分析了两环境下籼稻米粒延伸性的遗传基础。结果表明，米粒延伸性及其相关性状(米粒长和饭粒长)，主要受制于遗传主效应，但也受到基因型与环境互作效应的控制。在遗传主效应中又以种子基因加性效应为主，其次是母体植株的基因效应。米粒长和饭粒长的狭义遗传率都

Genetic Analysis of Cooked Rice Elongation in Indica Rice (Oryza sativa L.)

Genetic models including genetic effects and genotype by environment interaction effects for traits of triploid endosperms in cereal crops were used to analyze the cooked rice elongation (CRE) traits of indica rice at two environments. It was found that the milled rice length (MRL), cooked rice length (CRL) and CRE were mainly controlled by the main genetic effects as well as the genotype by environment interaction effects. As to the main genetic effects, the three traits were mainly controlled by the seed direct additive effects, but the maternal additive and dominance effects could not be neglected. MRL and CRL had a higher narrow sense heritabilities (65.9% and 61.7%, respectively) than CRE (43.9%), which suggested that early selection for MRL and CRL was effective while not effective for CRE. Prediction of the genetic effects of the parents showed that the Miyang 46 was better than the others for making a cross with improved cooked rice elongation, because it could increase both CRL and CRE.