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首页> 外文期刊>Journal of Experimental Botany >Intracellular energy depletion triggers programmed cell death during petal senescence in tulip
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Intracellular energy depletion triggers programmed cell death during petal senescence in tulip

机译：细胞内能量耗竭在郁金香花瓣衰老期间触发程序性细胞死亡

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摘要

Programmed cell death (PCD) in petals provides a model system to study the molecular aspects of organ senescence. In this study, the very early triggering signal for PCD during the senescence process from young green buds to 14-d-old petals of Tulipa gesneriana was determined. The opening and closing movement of petals of intact plants increased for the first 3 d and then gradually decreased. DNA degradation and cytochrome c (Cyt c) release were clearly observed in 6-d-old flowers. Oxidative stress or ethylene production can be excluded as the early signal for petal PCD. In contrast, ATP was dramatically depleted after the first day of flower opening. Sucrose supplementation to cut flowers maintained their ATP levels and the movement ability for a longer time than in those kept in water. The onset of DNA degradation, Cyt c release, and petal senescence was also delayed by sucrose supplementation to cut flowers. These results suggest that intracellular energy depletion, rather than oxidative stress or ethylene production, may be the very early signal to trigger PCD in tulip petals.
机译：花瓣中的程序性细胞死亡（PCD）提供了一个模型系统来研究器官衰老的分子方面。在这项研究中，确定了衰老过程中PCD的非常早的触发信号，该过程是从年轻的绿芽到郁金香的14 d花瓣。完整植物花瓣的开闭运动在前3天增加，然后逐渐减少。在6天大的花朵中清楚地观察到DNA降解和细胞色素c（Cyt c）释放。可以将氧化应激或乙烯生成排除为花瓣PCD的早期信号。相反，在开花的第一天后，ATP急剧减少。补充蔗糖来切花的时间比保持在水中的时间长，可以保持其ATP水平和运动能力。添加蔗糖切花也延迟了DNA降解，Cyt c释放和花瓣衰老的开始。这些结果表明，细胞内能量消耗而不是氧化应激或乙烯产生，可能是触发郁金香花瓣中PCD的非常早期的信号。

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