GA-20 oxidase as a candidate for the semidwarf gene sdw1/denso in barley

文献类型： 外文期刊

第一作者： Jia, Qiaojun

作者： Jia, Qiaojun;Jia, Qiaojun;Westcott, Sharon;Lance, Reg;Li, Chengdao;Zhang, Jingjuan;Westcott, Sharon;Zhang, Xiao-Qi;Li, Chengdao;Bellgard, Mathew

作者机构：

关键词： Semidwarf;Comparative mapping;Candidate gene;Gibberellic acid;SNP;Plant height;sdw1/denso

期刊名称：FUNCTIONAL & INTEGRATIVE GENOMICS （ 影响因子：3.41； 五年影响因子：3.616 ）

ISSN： 1438-793X

年卷期： 2009 年 9 卷 2 期

页码：

收录情况： SCI

摘要： The barley sdw1/denso gene not only controls plant height but also yield and quality. The sdw1/denso gene was mapped to the long arm of chromosome 3H. Comparative genomic analysis revealed that the sdw1/denso gene was located in the syntenic region of the rice semidwarf gene sd1 on chromosome 1. The sd1 gene encodes a gibberellic acid (GA)-20 oxidase enzyme. The gene ortholog of rice sd1 was isolated from barley using polymerase chain reaction. The barley and rice genes showed a similar gene structure consisting of three exons and two introns. Both genes share 88.3% genomic sequence similarity and 89% amino acid sequence identity. A single nucleotide polymorphism was identified in intron 2 between barley varieties Baudin and AC Metcalfe with Baudin known to contain the denso semidwarf gene. The single nucleotide polymorphism (SNP) marker was mapped to chromosome 3H in a doubled haploid population of Baudin x AC Metcalfe with 178 DH lines. Quantitative trait locus analysis revealed that plant height cosegregated with the SNP. The sdw1/denso gene in barley is the most likely ortholog of the sd1 in rice. The result will facilitate understanding of the molecular mechanism controlling semidwarf phenotype and provide a diagnostic marker for selection of semidwarf gene in barley.

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