Genetic Effects of Fruit, Seed and Seedling Traits of Alnus cremastogyne Burk in a 7×7 Complete Diallel Cross Design

doi:10.7525/j.issn.1673-5102.2018.03.007

Abstract

Abstract: The genetic parameters of parents were estimated by analyzing its hybrids descendant for fruit, seed and seedling traits to select optimum parents for crossbreeding of Alnus cremastogyne Burk. Seven parents of A. cremastogyne were crossed by a 7×7 diallel cross design and their hybrid fruits, seeds and seedlings were tested for fresh weight, thousand seed weight, phenotypic characters like fruit and seed length, seedling height, and caliper. The results showed that there were very significant differences in the characteristics of fruit fresh weight, thousand kernel weight, phenotype character of fruit and seed, seedling height, and caliper between 49 cross groups(P<0.001). In the general combining ability(GCA), specific combining ability(SCA) and reciprocal effects(REC) of fruit fresh weight, thousand kernel weight, and phenotype character of fruit and seed(P<0.001). There also were very significant differences of GCA, SCA, and REC for seedling height and caliper(P<0.001). The broad-sense heritability of seedling height and caliper were 37.06% and 38.04%, and the narrow-sense heritability of seedling height and caliper were 17.47% and 16.03%, respectively. That means higher environment effects existed in the stage of seedling growth. The additive variance of fruit and seed characters were from 1.34 to 11.79 times to non-additive variance, which mainly controlled by additive gene effect, followed by non-additive effect. Otherwise, the non-additive variance of seedling height and caliper were 1.12 and 1.37 times to additive variance, which mainly controlled by non-additive gene effect, followed by additive effect. JG6 and JT4 are superior parents according to the effects of GCA, SCA, and REC. Also, four groups(BZ6×JG6, BZ6×SW2, JT4×TT13 and BZ6×QJ1) are superior cross groups, which hybrids descendants get 20.47%-76.22% genetic gain on seedling height and 5.07%-43.18% genetic gain on the caliper, respectively.

Key words: Alnus cremastogyne Burk, complete diallel cross, GCA, SCA, genetic gain

CLC Number:

S792.14

GUO Hong-Ying, YANG Han-Bo, CHEN Zhi, WANG Ze-Liang, HUANG Zhen, LI Jia-Man, XIAO Xing-Cui, KANG Xiang-Yang. Genetic Effects of Fruit, Seed and Seedling Traits of Alnus cremastogyne Burk in a 7×7 Complete Diallel Cross Design[J]. Bulletin of Botanical Research, 2018, 38(3): 357-366.

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