Characterization and mapping of a Prbs gene controlling spike development in Hordeum vulgare L.
文献类型： 外文期刊
作者： Shang, Yi 1 ; Zhu, Jinghuan 1 ; Hua, Wei 1 ; Wang, Junmei 1 ; Jia, Qiaojun 1 ; Yang, Jianming 1 ;
作者机构： 1.Zhejiang Acad Agr Sci, Inst Crop & Nucl Technol Utilizat, Natl Barley Improvement Ctr, Hangzhou 310021, Zhejiang, Peoples R China
关键词： Poly-row-and-branched spike (prbs);Barley inflorescence;Spikelet;Mapping
期刊名称：GENES & GENOMICS （ 影响因子：1.839； 五年影响因子：1.329 ）
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收录情况： SCI
摘要： The barley mutant, poly-row-and-branched spike (prbs) showed altered inflorescence morphology: complete conversion of the rudimentary lateral spikelets in two-rowed barley into fully developed fertile spikelets similar to the six-rowed phenotype, and additional spikelets in the middle of spike. Moreover, branched spikes emerged in progeny from a cross between the mutant and a six-rowed barley cultivar. Morphological observation of the development of immature spikes of the mutant and descendants with branched spikes showed that the Prbs gene is involved in spikelet development in the triple-mound stage. In mutant prbs, new meristems initiated at the flanks of lateral spikelets and middle spikelet meristems were converted to branch meristems, developing branched spikes. These observations suggested that the Prbs gene plays a crucial role in spikelet initiation and identity maintenance. The Prbs gene may be an important modifier in inflorescence differentiation from a panicle into a spike. The branched spikes emerging in hybrids from a cross between the mutant and six-rowed barley cultivar were not conferred by the gene vrs1 or Int-c, which decide spike morphology in six-rowed barley. These results imply that although six-row genes vrs1 and Int-c and prbs have similar effects on lateral spikelet development, they have different functions in branched spikes. The Prbs gene was mapped to chromosome 3H between SSR marker Bmag0023 and marker Cbic60 at a genetic distance of 3.3 and 5.4 centimorgans (cM), respectively.
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