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首页> 外文期刊>Plant signaling & behavior >Drought adaptation in plants with crassulacean acid metabolism involves the flexible use of different storage carbohydrate pools
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Drought adaptation in plants with crassulacean acid metabolism involves the flexible use of different storage carbohydrate pools

机译：具十字绣花酸代谢的植物对干旱的适应性涉及灵活利用不同的储存碳水化合物库

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Nocturnal CO_2 uptake in CAM plants is sustained by the degradation of storage carbohydrate which provides the acceptor (PEP) for the nocturnal carboxylase (PEPC). The investment of resources into a transient storage carbohydrate pool unavoidably places restriction on other metabolic activities including dark respiration, growth and acclimation to abiotic stress. In our recent report the flexible use of different storage carbohydrate pools is shown to be involved in the acclimation process to droughtand recovery from dehydration. While starch breakdown stoichiometrically accounts for nocturnal CO_2 uptake under well-watered conditions, the sucrose pool is maintained in preference to starch during progressing drought and sucrose becomes the major source of carbon fuelling the dark reactions after 45 days of water deprivation. Re-watering plants results in a recovery to the original situation, with starch constituting the main carbohydrate reserve for nocturnal provision of PEP. However, substantialamounts of starch are also retained in the leaves of re-watered plants by restricting export/respiration and thus provides a potential buffer capacity against a return to water deprivation. This significant conservation of starch suggests the ability toperceive, remember and anticipate the formerly encountered drought stress in some way, with the adaptation of the equilibrium of carbohydrate balance as a central factor underpinning the physiological homeostasis of CAM plants.
机译：CAM植物中夜间CO_2的吸收通过碳水化合物的储存得以维持，这为夜间羧化酶（PEPC）提供了受体（PEP）。将资源投资到临时存储的碳水化合物库中不可避免地会限制其他代谢活动，包括黑暗呼吸，生长和适应非生物胁迫。在我们最近的报告中，灵活使用不同的碳水化合物储存库显示了其适应干旱和从干旱中恢复的过程。虽然淀粉按化学计量分解是在充足灌溉条件下夜间吸收CO_2的指标，但在干旱持续发展期间，蔗糖的储量优先于淀粉，并且在缺水45天后，蔗糖成为了为黑暗反应提供燃料的主要碳源。再给植物浇水可以恢复到原始状态，其中淀粉构成了夜间提供PEP的主要碳水化合物储备。然而，通过限制出口/呼吸作用，大量的淀粉也保留在回水植物的叶子中，因此提供了潜在的缓冲能力来防止水的匮乏。淀粉的这种显着保存表明，人们能够以某种方式感知，记忆和预测以前遇到的干旱胁迫，其中碳水化合物平衡平衡的适应是支撑CAM植物生理稳态的重要因素。

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