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Histological, hormonal and transcriptomic reveal the changes upon gibberellin-induced parthenocarpy in pear fruit

机译:组织学,激素和转录组学揭示了赤霉素诱导梨果实单性结实的变化

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Phytohormones play crucial roles in fruit set regulation and development. Here, gibberellins (GA4+7), but not GA3, induced pear parthenocarpy. To systematically investigate the changes upon GA4+7 induced pear parthenocarpy, dynamic changes in histology, hormone and transcript levels were observed and identified in unpollinated, pollinated and GA4+7-treated ovaries. Mesocarp cells continued developing in both GA4+7-treated and pollinated ovaries. In unpollinated ovaries, mesocarp cells stopped developing 14 days after anthesis. During fruit set process, GA4+7, but not GA1+3, increased after pollination. Abscisic acid (ABA) accumulation was significantly repressed by GA4+7 or pollination, but under unpollinated conditions, ABA was produced in large quantities. Moreover, indole-3-acetic acid biosynthesis was not induced by GA4+7 or pollination treatments. Details of this GA–auxin–ABA cross-linked gene network were determined by a comparative transcriptome analysis. The indole-3-acetic acid transport-related genes, mainly auxin efflux carrier component genes, were induced in both GA4+7-treated and pollinated ovaries. ABA biosynthetic genes of the 9-cis-epoxycarotenoid dioxygenase family were repressed by GA4+7 and pollination. Moreover, directly related genes in the downstream parthenocarpy network involved in cell division and expansion (upregulated), and MADS-box family genes (downregulated), were also identified. Thus, a model of GA-induced hormonal balance and its effects on parthenocarpy were established.
机译:植物激素在水果的调控和发育中起着至关重要的作用。在这里,赤霉素(GA 4 + 7 )而不是GA 3 引起梨单性结实。为了系统研究GA 4 + 7 诱导的梨单性结实的变化,观察并鉴定了未授粉,授粉和GA 4 + 7 的组织学,激素和转录水平的动态变化。治疗的卵巢。在GA 4 + 7 处理和授粉的卵巢中,中果皮细胞继续发育。在未授粉的卵巢中,中果皮细胞在开花后14天停止发育。在坐果过程中,授粉后GA 4 + 7 增加,而GA 1 + 3 没有增加。 GA 4 + 7 或授粉可显着抑制脱落酸(ABA)的积累,但在未授粉条件下会大量产生ABA。此外,GA 4 + 7 或授粉处理均未诱导吲哚-3-乙酸的生物合成。通过比较转录组分析确定了GA-生长素-ABA交联基因网络的细节。 GA 4 + 7 处理和授粉卵巢均诱导了吲哚-3-乙酸转运相关基因,主要是生长素外排载体成分基因。 GA 4 + 7 和授粉抑制了9-顺式-环氧类胡萝卜素双加氧酶家族的ABA生物合成基因。此外,还确定了下游单性结实网络中与细胞分裂和扩增有关的直接相关基因(上调)和MADS-box家族基因(下调)。因此,建立了GA诱导的激素平衡及其对单性结实的影响的模型。

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