青稞籽粒阿拉伯木聚糖含量的遗传分析

为了解青稞籽粒阿拉伯木聚糖的遗传特性,以喜马拉雅8号和藏青320及二者构建的F_1和F_2群体为材料,使用主基因+多基因模型,对青稞籽粒总阿拉伯木聚糖含量、水溶性阿拉伯木聚糖含量、不溶性阿拉伯木聚糖含量及不溶性阿拉伯木聚糖/水溶性阿拉伯木聚糖比值进行了遗传分析。结果表明,青稞籽粒总阿拉伯木聚糖含量与不溶性阿拉伯木聚糖含量显著相关,而与水溶性阿拉伯木聚糖含量相关不显著。籽粒总阿拉伯木聚糖符合1对显性-加性主基因+多基因遗传模式。不溶性与水溶性阿拉伯木聚糖及不溶性与水溶性阿拉伯木聚糖之比均受2对主基因+多基因调控,只是主基因的作用方式存在着差异。控制水溶性阿拉伯木聚糖和不溶性阿拉伯木聚糖含量的主基因加性效应均为负值,可能为负调控因子。除调控水溶性阿拉伯木聚糖含量的主基因加性效应较小外,其余性状的主基因加性效应均较大。各性状的主基因遗传率都较高,为62.5%~88.49%。

Genetic Analysis of Arabinoxylan Content in Grain of Hulless Barley

In order to understand the genetics model and genetics basis of arabinoxylan and the related traits of hulless barley,a set of F1 and F2 population derived from a cross between Himalaya 8 and Zangqing 320,along with their parents were employed to uncover the genetics basis of grain AX content by using the methodology called "mixed major gene plus multi-gene inheritance model".The result showed that significant correlation between water-unextractable arabinoxylan (WUAX) and total arabinoxylan (TAX) were detected,while WUAX was not significantly correlated with water-extractable arabinoxylan (WEAX).TAX was controlled by one major gene with dominant-additive effect but without polygenic affect.WEAX,WUAX and WUAX/WEAX were controlled by two major gene with polygenic effect,and the expression patterns of the major gene were different among three traits.The additive effect of the major genes controlling WEAX and WUAX were negative,which suggested as a negative regulatory factor.The additive effects of major genes controlling all the traits,except for WEAX,were strong.The major gene with high heritability,with a range from 62.5% to 88.49%,determined all the trait variation in this research.