Waterlogging is a severe environmental stress that causes severe crop productivity losses. Cucumber (Cucumis sativus L.) survives waterlogging by producing adventitious roots (ARs) that enhance gas exchange. Little is known about the role of light and sugars in the waterlogging-induced production of ARs. The role of these factors in AR production was therefore studied in cucumber seedlings grown in the absence or presence of waterlogging and different light conditions. The effect of photosynthesis was studied by removing the shoots of the seedlings and replacing them with exogenous applications of sucrose or stachyose. Shoot removal inhibited AR emergence and elongation. However, the exogenous application of sugars fully restored AR emergence and partially restored root elongation. The exogenous application of a synthetic auxin restored AR emergence but not AR elongation. Transcriptome profiling analysis was used to determine the effects of light on gene expression in the hypocotyls under these conditions. The levels of transcripts encoding proteins involved in auxin transport and signalling were higher in the light and following the exogenous application of sucrose and stachyose. These results show that the waterlogging-induced emergence of ARs is regulated by the interaction between sugars and auxin, whereas AR elongation depends only on sugars alone.

中文翻译：

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糖通过促进植物生长素的运输和信号传导，增强了渍水诱导黄瓜不定根的形成。

涝灾是一种严重的环境压力，会导致严重的农作物生产力损失。黄瓜（Cucumis sativus L.）通过产生增强气体交换的不定根（AR）幸免于涝。关于光和糖在水淹诱导的ARs产生中的作用知之甚少。因此，在不存在或存在涝渍和不同光照条件下生长的黄瓜幼苗中，研究了这些因素在AR生产中的作用。通过去除幼苗的芽并用外源蔗糖或水苏糖代替它们来研究光合作用的效果。去除芽抑制了AR的出现和伸长。但是，糖的外源施用完全恢复了AR的出现，部分恢复了根的伸长。合成植物生长素的外源应用恢复了AR的出现，但没有恢复AR的延伸。在这些条件下，通过转录组分析分析来确定光对下胚轴基因表达的影响。在光照下和外源施加蔗糖和水苏糖后，编码参与生长素运输和信号传导的蛋白质的转录物水平更高。这些结果表明，水淹诱导的AR的出现受糖和生长素之间的相互作用所调节，而AR的延长仅取决于糖。在光照下和外源施加蔗糖和水苏糖后，编码参与生长素运输和信号传导的蛋白质的转录物水平更高。这些结果表明，水淹诱导的AR的出现受糖和生长素之间的相互作用所调节，而AR的延长仅取决于糖。在光照下和外源施加蔗糖和水苏糖后，编码参与生长素运输和信号传导的蛋白质的转录物水平更高。这些结果表明，水淹诱导的AR的出现受糖和生长素之间的相互作用所调节，而AR的延长仅取决于糖。