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Crassulacean acid metabolism (CAM) supersedes the turgor loss point (TLP) as an important adaptation across a precipitation gradient, in the genus Clusia
Functional Plant Biology ( IF 3 ) Pub Date : 2021-03-05 , DOI: 10.1071/fp20268
Alistair Leverett 1 , Natalia Hurtado Castaño 2 , Kate Ferguson 3 , Klaus Winter 4 , Anne M Borland 3
Affiliation  

As future climates continue to change, precipitation deficits are expected to become more severe across tropical ecosystems. As a result, it is important that we identify plant physiological traits that act as adaptations to drought, and determine whether these traits act synergistically or independently of each other. In this study, we assessed the role of three leaf-level putative adaptations to drought: crassulacean acid metabolism (CAM), the turgor loss point (TLPΨ) and water storage hydrenchyma tissue. Using the genus Clusia as a model, we were able to explore the extent to which these leaf physiological traits co-vary, and also how they contribute to species’ distributions across a precipitation gradient in Central and South America. We found that CAM is independent of the TLPΨ and hydrenchyma depth in Clusia. In addition, we provide evidence that constitutive CAM is an adaptation to year-long water deficits, whereas facultative CAM appears to be more important for surviving acute dry seasons. Finally, we find that the other leaf traits tested did not correlate with environmental precipitation, suggesting that the reduced transpirational rates associated with CAM obviate the need to adapt the TLPΨ and hydrenchyma depth in this genus.



中文翻译:

克劳苏糖酸代谢(CAM)取代了膨松损失点(TLP),这是克劳西亚(Clusia)属中整个降水梯度的重要适应方式。

随着未来气候的不断变化,预计热带生态系统中的降水不足将更加严重。因此,重要的是,我们必须识别出能够适应干旱的植物生理性状,并确定这些性状是协同还是独立发挥作用。在这项研究中,我们评估了三种叶级假定适应干旱的作用:景天酸代谢(CAM),膨损失点(TLP Ψ)和蓄水hydrenchyma组织。使用Clusia属作为模型,我们能够探索这些叶片生理性状变化的程度,以及它们如何对中美洲和南美洲的降水梯度中的物种分布做出贡献。我们发现CAM独立于TLPΨ和hydrenchyma深度Clusia。此外,我们提供的证据表明,本构CAM是对长达一年的缺水的一种适应,而兼性CAM对于急性干旱季节的生存似乎更为重要。最后,我们发现测试的其他叶片性状没有环保沉淀相关,这表明与CAM相关的降低蒸腾速率避免需要相适应的TLP Ψ和hydrenchyma深度在此属。

更新日期:2021-03-07
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