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首页> 外文期刊>Journal of Experimental Botany >TIR1-like auxin-receptors are involved in the regulation of plum fruit development
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TIR1-like auxin-receptors are involved in the regulation of plum fruit development

机译：TIR1样生长素受体参与李子果实发育的调控。

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Ethylene has long been considered the key regulator of ripening in climacteric fruit. Recent evidence showed that auxin also plays an important role during fruit ripening, but the nature of the interaction between the two hormones has remained unclear. To understand the differences in ethylene-and auxin-related behaviours that might reveal how the two hormones interact, we compared two plum (Prunus salicina L.) cultivars with widely varying fruit development and ripening ontogeny. The early-ripening cultivar, Early Golden (EG), exhibited high endogenous auxin levels and auxin hypersensitivity during fruit development, while the late-ripening cultivar, V98041 (V9), displayed reduced auxin content and sensitivity. We show that exogenous auxin is capable of dramatically accelerating fruit development and ripening in plum, indicating that this hormone is actively involved in the ripening process. Further, we demonstrate that the variations in auxin sensitivity between plum cultivars could be partially due to PslAFB5, which encodes a TIR1-like auxin receptor. Two different PslAFB5 alleles were identified, one (Pslafb5) inactive due to substitution of the conserved F-box amino acid residue Pro(61) to Ser. The early-ripening cultivar, EG, exhibited homozygosity for the inactive allele; however, the late cultivar, V9, displayed a PslAFB5/afb5 heterozygous genotype. Our results highlight the impact of auxin in stimulating fruit development, especially the ripening process and the potential for differential auxin sensitivity to alter important fruit developmental processes.
机译：长期以来，乙烯一直被认为是更年期水果成熟的关键调节剂。最近的证据表明，生长素在果实成熟过程中也起着重要作用，但两种激素之间相互作用的性质仍不清楚。为了了解乙烯和植物生长素相关行为的差异（可能揭示两种激素如何相互作用），我们将两个李子（李子李）品种的果实发育和成熟个体差异很大。早熟的品种早金（EG）在水果发育过程中表现出较高的内源性生长素水平和植物生长素超敏性，而晚熟的品种V98041（V9）则显示出降低的生长素含量和敏感性。我们表明，外源生长素能够显着加速李子的果实发育和成熟，表明该激素积极参与了成熟过程。此外，我们证明李子品种之间植物生长素敏感性的变化可能部分归因于PslAFB5，其编码TIR1样植物生长素受体。确定了两个不同的PslAFB5等位基因，一个（Pslafb5）无活性，因为保守的F-box氨基酸残基Pro（61）被替换为Ser。早期成熟的品种EG对无活性的等位基因表现出纯合性。然而，晚期品种V9表现出PslAFB5 / afb5杂合基因型。我们的结果强调了生长素在刺激果实发育中的作用，特别是成熟过程以及生长素敏感性差异可能改变重要的果实发育过程。

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