Characterization of Gibberellin Receptor Mutants of Barley （Hordeum vulgare L.）
Characterization of Gibberellin Receptor Mutants of Barley （Hordeum vulgare L.）作者机构：CSIRO Plant Industry GPO Box 1600 Canberra ACT 2601 Australia Research School of Chemistry Australian National University Canberra ACT 0200 Australia
出 版 物：《Molecular Plant》 (分子植物（英文版）)
年 卷 期：2008年第1卷第2期
页 面：285-294页
核心收录：
学科分类：09[农学] 0904[农学-植物保护] 0901[农学-作物学]
主 题：Characterization Gibberellin Receptor Mutants
摘 要：The sequence of Gidl （a gene for a gibberellin （GA） receptor from rice） was used to identify a putative orthologue from barley. This was expressed in E. coil, and produced a protein that was able to bind GA in vitro with both structural specificity and saturability. Its potential role in GA responses was investigated using barley mutants with reduced GA sensitivity （gsel mutants）. Sixteen different gsel mutants each carried a unique nucleotide substitution in this sequence. In all but one case, these changes resulted in single amino acid substitutions, and, for the remaining mutant, a substitution in the 5＇ untranslated region of the mRNA is proposed to interfere with translation initiation. There was perfect linkage in segregating populations between new mutant alleles and the gsel phenotype, leading to the conclusion that the putative GID1 GA receptor sequence in barley corresponds to the Gsel locus. Determination of endogenous GA contents in one of the mutants revealed enhanced accumulation of bioactive GA1, and a deficit of C20 GA precursors. All of the gsel mutants had reduced sensitivity to exogenous GA3, and to AC94377 （a GA analogue） at concentrations that are normally ＇saturating＇, but, at much higher concentrations, there was often a considerable response. The comparison between barley and rice mutants reveals interesting differences between these two cereal species in GA hormonal physiology.
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