The auxin receptor homologue in Solanum lycopersicum stimulates tomato fruit set and leaf morphogenesis
The auxin receptor homologue in Solanum lycopersicum stimulates tomato fruit set and leaf morphogenesis
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DOI：
10.1093/jxb/erq455
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发表时间：
2011-05-01
影响因子：
6.9
通讯作者：
Hao, Yanwei
中科院分区：
文献类型：
--
作者：
Ren, Zhenxin;Li, Zhengguo;Hao, Yanwei
TIR 1及其同源物作为生长素受体，在生长素介导的植物发育中起着至关重要的作用。虽然生长素受体基因的功能已经在拟南芥中得到了广泛的研究，但还没有关于植物中TIR 1过表达调节果实发育的结果的报道。在这里，一个假定的番茄生长素受体基因，拟南芥AtTIR 1同源，报告。该基因被命名为番茄TIR1（Solanum lycopersicum TIR1，SlTIR1），在开花期的花芽和花的所有部位都有表达。从花蕾到开花，SlTIR1在萼片组织中的表达略有增加，而在雄蕊中的表达急剧下降。从开花期到开花后坐果期，SlTIR1在子房和萼片中的表达逐渐下降。SlTIR1的过表达导致包括单性结实果实形成和叶形态的多效表型。此外，SlTIR1过表达改变了许多生长素反应基因的转录水平。目前的数据表明，番茄SlTIR1基因在花到果实的过渡和叶片形成阶段起着重要的作用。
TIR1 and its homologues act as auxin receptors and play a crucial role in auxin-mediated plant development. While the functions of auxin receptor genes have been widely studied in Arabidopsis thaliana, there has been no report on the consequences of TIR1 overexpression in plants that regulate fruit development. Here a putative tomato auxin receptor gene, homologous to Arabidopsis AtTIR1, is reported. This gene, designated as Solanum lycopersicum TIR1 (SlTIR1), was found to be expressed in all the parts of floral buds and flowers at anthesis stages. From bud to anthesis, SlTIR1 expression increases slightly in sepal tissue and decreases dramatically in stamen. From anthesis to post-anthesis when fruit set is expected to occur, the expression of SlTIR1 declines in the ovary and sepal. Overexpression of SlTIR1 results in a pleiotropic phenotype including parthenocarpic fruit formation and leaf morphology. Furthermore, SlTIR1 overexpression altered transcript levels of a number of auxin-responsive genes. The present data demonstrate that the tomato SlTIR1 gene plays an important role at the stages of flower-to-fruit transition and leaf formation.