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Isolation and characterization of a GAI/RGA-like gene from Gossypium hirsutum

文献类型： 外文期刊

作者： Liao, Wen-bin 1 ; Ruan, Meng-bin 1 ; Cui, Bai-ming 1 ; Xu, Nan-fei 2 ; Lu, Jia-ju 1 ; Peng, Ming 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou 571101, Hainan, Peoples R China

2.BASF Plant Sci LLC, Res Triangle Pk, NC 27709 USA

关键词： Arabidopsis;Cotton fiber development;Cotton (Gossypium hirsutum);DELLA protein;Gibberellin

期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.412； 五年影响因子：3.691 ）

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收录情况： SCI

摘要： The aim of the investigation reported here was to assess the role of gibberellin in cotton fiber development. The results of experiments in which the gibberellin (GA) biosynthesis inhibitor paclobutrazol (PAC) was tested on in vitro cultured cotton ovules revealed that GA is critical in promoting cotton fiber development. Plant responses to GA are mediated by DELLA proteins. A cotton nucleotide with high sequence homology to Arabidopsis thaliana GAI (AtGAI) was identified from the GenBank database and analyzed with the BLAST program. The full-length cDNA was cloned from upland cotton (Gossypium hirsutum, Gh) and sequenced. A comparison of the putative protein sequence of this cDNA with all Arabidopsis DELLA proteins indicated that GhRGL is a putative ortholog of AtRGL. Over-expression of this cDNA in Arabidopsis plants resulted in the dwarfed phenotype, and the degrees of dwarfism were related to the expression levels of GhRGL. The deletion of 17 amino acids, including the DELLA domain, resulted in the dominant dwarf phenotype, demonstrating that GhRGL is a functional protein that affects plant growth. Real-time quantitative PCR results showed that GhRGL mRNA is highly expressed in the cotton ovule at the elongation stage, suggesting that GhRGL may play a regulatory role in cotton fiber elongation.

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