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GENETIC SEGREGATION ANALYSIS OF A RAPESEED DWARF MUTANT

文献类型： 外文期刊

作者： Xiang, Yang 1 ; Tong, Chaobo 2 ; Yu, Shizhou 1 ; Zhang, Tao 1 ; Zhao, Jixian 1 ; Lei, Shaolin 1 ; Di, Caifu 1 ; Liu, Shen 1 ;

作者机构： 1.Guizhou Acad Agr Sci, Guizhou Rapeseed Inst, Guiyang 550008, Peoples R China

2.Chinese Acad Agr Sci, Key Lab Biol & Genet Improvement Oil Crops, Minist Agr, Oil Crops Res Inst, Wuhan 430062, Peoples R China

关键词： Brassica napus;dwarf mutant;genetic analysis

期刊名称：PAKISTAN JOURNAL OF BOTANY （ 影响因子：0.972； 五年影响因子：0.988 ）

ISSN： 0556-3321

年卷期： 2016 年 48 卷 4 期

页码：

收录情况： SCI

摘要： Dwarf resources in Brassica napus are very important for developing high-yield cultivars through dwarf-type and lodging-resistant breeding. However, few dwarf varieties have been available for this species. Here, we reported a new rapeseed dwarf mutant GRCI 157, which exhibits obvious phenotypic variations on dwarf. Six generations (P-1, P-2, F-1, F-2, B-1, and B-2) were produced from a cross between dwarf mutant GRC1157 and an elite tall-type line XR16 to analyze genetic inheritances of plant height (PH), numbers of the 1st valid branch (VBN), main inflorescence length (MIL), pod numbers per main inflorescence (MPN), pod length (PL) and seed numbers per pod (PSN) using the mixed major gene plus polygene inheritance model. The genetic analysis shows different traits were controlled by different inheritance models: PH and PL by two pairs of additive-dominant-epistatic major genes plus additive-dominant-epistatic polygenes, MPN and PSN by two-pair additive-dominant-epistatic major genes plus additive-dominant polygenes, MIL by two-pair additive-dominant-epistatic major genes and VBN by one-pair additive-dominant major genes plus additive-dominantepistatic polygenes. Furthermore, positive correlations between PH and some other traits were observed, suggesting that some traits may be co-regulated by several linkage or same loci/genes. In addition, high heritability (40.35-93.7%) were found for five traits (except VBN) in different segregating generations, indicating these traits were mainly affected by hereditary factors and suitable for early artificial selection. In sum, the dwarf mutant GRC1157 can serve as a valuable resource for rapeseed dwarf breeding and the genetic analysis in this study provided a foundation for further mapping and cloning dwarf genes in mutant GRC1157.

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