Bailly Christophe, El Maarouf Bouteau Hayat, Corbineau Françoise
EA 2388 Physiologie des Semences, Université Pierre et Marie Curie-Paris 6, Le Raphaël, site d'Ivry, boîte 152, 4 place Jussieu, 75005 Paris, France.
J Soc Biol. 2008;202(3):241-8. doi: 10.1051/jbio:2008025. Epub 2008 Nov 4.
Recent advances in plant physiology signaling pathways have led to consider reactive oxygen species (ROS) as being key actors in the regulation of germination and dormancy. ROS accumulation during seed dry storage or during their imbibition would trigger cellular events controlling the realization of germination. We show that ROS accumulation triggers specific carbonylation of proteins thus modifying the occurrence of enzyme-mediated reactions during germination or facilitating reserve protein degradation through the proteasome. This suggests that dormancy is in part controlled by protein oxidation. ROS can also act as a positive signal in seed dormancy release through their effect on other mechanisms such as the control of the cellular redox status and the activation of transcription factors. Their interaction with abscisic acid and gibberellins is also evoked and a new mechanism of dormancy regulation in which ROS crosstalk with hormonal pathways is proposed.
植物生理学信号通路的最新进展使人们认为活性氧（ROS）是种子萌发和休眠调控中的关键因素。种子干燥储存期间或吸水过程中ROS的积累会引发控制种子萌发的细胞事件。我们发现，ROS的积累会引发蛋白质的特异性羰基化，从而改变种子萌发过程中酶介导反应的发生，或通过蛋白酶体促进储备蛋白的降解。这表明休眠部分受蛋白质氧化的控制。ROS还可以通过影响其他机制，如细胞氧化还原状态的控制和转录因子的激活，在种子休眠解除中作为正向信号发挥作用。文中还提到了它们与脱落酸和赤霉素的相互作用，并提出了一种新的休眠调控机制，即ROS与激素信号通路相互作用。
