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首页> 外文期刊>Journal of Experimental Botany >Photosynthetic and metabolic acclimation to repeated drought events play key roles in drought tolerance in coffee
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Photosynthetic and metabolic acclimation to repeated drought events play key roles in drought tolerance in coffee

机译：反复干旱事件的光合和代谢适应在咖啡中的耐旱性中发挥关键作用

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Over the last decades, most information on the mechanisms underlying tolerance to drought has been gained by considering this stress as a single event that happens just once in the life of a plant, in contrast to what occurs under natural conditions where recurrent drought episodes are the rule. Here we explored mechanisms of drought tolerance in coffee (Coffea canephora) plants from a broader perspective, integrating key aspects of plant physiology and biochemistry. We show that plants exposed to multiple drought events displayed higher photosynthetic rates, which were largely accounted for by biochemical rather than diffusive or hydraulic factors, than those submitted to drought for the first time. Indeed, these plants displayed higher activities of RuBisCO and other enzymes associated with carbon and antioxidant metabolism. Acclimation to multiple drought events involved the expression of trainable genes related to drought tolerance and was also associated with a deep metabolite reprogramming with concordant alterations in central metabolic processes such as respiration and photorespiration. Our results demonstrate that plants exposed to multiple drought cycles can develop a differential acclimation that potentiates their defence mechanisms, allowing them to be kept in an 'alert state' to successfully cope with further drought events.
机译：在过去的几十年中，大多数关于在植物生命中发生的一次发生这种情况的耐受耐旱宽容的宽容的机制的大多数信息都是通过植物生命中发生的一次发生的，与在经常性​​干旱发作的自然条件下发生的事情相反规则。在这里，我们从更广泛的角度来看，探索了咖啡（Coffea Canephora）植物中的耐旱耐受的机制，整合了植物生理学和生物化学的关键方面。我们表明暴露于多次干旱事件的植物显示出较高的光合速率，这些速率主要由生物化学而不是扩散或液压因素，而不是第一次提交干旱的液压因素。实际上，这些植物显示了Rubisco和与碳和抗氧化代谢相关的其他酶的更高活性。对多次干旱事件的适应涉及与干旱耐受相关的可培训基因的表达，并且还与深度代谢物重编程相关，其中中央代谢过程如呼吸和光呼吸的交叉改变。我们的结果表明，暴露于多次干旱循环的植物可以制定差动适应，从而提高其防御机制，使他们能够保持在“警报状态”以成功应对进一步的干旱事件。

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