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首页> 外文期刊>Journal of Experimental Botany >Correlation between development of female flower buds and expression of the CS-ACS2 gene in cucumber plants
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Correlation between development of female flower buds and expression of the CS-ACS2 gene in cucumber plants

机译：黄瓜植株雌花芽发育与CS-ACS2基因表达的相关性

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Ethylene plays a key role in sex determination of cucumber flowers. Gynoecious cucumber shoots produce more ethylene than monoecious shoots. Because monoecious cucumbers produce both male and female flower buds in the shoot apex and because the relative proportions of male and female flowers vary due to growing conditions, the question arises as to whether the regulation of ethylene biosynthesis in each flower bud determines the sex of the flower. Therefore, the expression of a 1-aminocyclopropane-1-carboxylic acid synthase gene, CS-ACS2, was examined in cucumber flower buds at different stages of development. The results revealed that CS-ACS2 mRNA began to accumulate just beneath the pistil primordia of flower buds at the bisexual stage, but was not detected prior to the formation of the pistil primordia. In buds determined to develop as female flowers, CS-ACS2 mRNA continued to accumulate in the central region of the developing ovary where ovules and placenta form. In gynoecious cucumber plants that produce only female flowers, accumulation of CS-ACS2 mRNA was detected in all flower buds at the bisexual stage and at later developmental stages. In monoecious cucumber, flower buds situated on some nodes accumulated CS-ACS2 mRNA, but others did not. The proportion of male and female flowers in monoecious cucumbers varied depending on the growth conditions, but was correlated with changes in accumulation of CS-ACS2 mRNA in flower buds. These results demonstrate that CS-ACS2-mediated biosynthesis of ethylene in individual flower buds is associated with the differentiation and development of female flowers.
机译：乙烯在黄瓜花的性别决定中起关键作用。雌蕊黄瓜芽比雌蕊芽产生更多的乙烯。由于雌雄异株的黄瓜在茎尖同时产生雄性和雌性花蕾，并且由于生长条件不同，雄性和雌性花的相对比例也会发生变化，因此出现了一个问题，即每个花蕾中乙烯生物合成的调控是否决定了花蕾的性别。花。因此，在发育的不同阶段，在黄瓜花芽中检查了1-氨基环丙烷-1-羧酸合酶基因CS-ACS2的表达。结果表明，在双性恋阶段，CS-ACS2 mRNA在花芽的雌蕊原基下方开始蓄积，但在雌蕊原基形成之前未检测到。在确定发育成雌花的芽中，CS-ACS2 mRNA继续在发育中的胚珠和胎盘形成的卵巢中央区域积聚。在仅产生雌花的雌蕊黄瓜植物中，在双性恋阶段和发育后期的所有花蕾中均检测到CS-ACS2 mRNA的积累。在雌雄异株的黄瓜中，位于某些节点上的花蕾会累积CS-ACS2 mRNA，而其他节点则不会。雌雄黄瓜中雄花和雌花的比例随生长条件而变化，但与花蕾中CS-ACS2 mRNA积累的变化相关。这些结果表明，CS-ACS2介导的单个花蕾中乙烯的生物合成与雌花的分化和发育有关。

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