Different mechanisms drive the performance of native and invasive woody species in response to leaf phosphorus supply during periods of drought stress and recovery.
Different mechanisms drive the performance of native and invasive woody species in response to leaf phosphorus supply during periods of drought stress and recovery.
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DOI：
10.1016/j.plaphy.2014.05.006
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
M. T. Oliveira;C. D. Medeiros;Gabriella Frosi;M. Santos
中科院分区：
文献类型：
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作者：
M. T. Oliveira;C. D. Medeiros;Gabriella Frosi;M. Santos
干旱胁迫和叶磷（Pi）供应对热带木本物种光合代谢的影响尚不清楚，鉴于最近的全球环境变化模型预测热带地区降水率较低和长期干旱期，此类研究变得越来越重要。通过分析叶片光合代谢、生化特性和水势，确定了控制干旱胁迫和Pi供给对两种木本植物Anadenanthera colubrina（原生）和Prosopis juliflora（入侵）盆栽幼苗的影响。在最大胁迫下，与各自的对照-Pi 相比，两个物种在干旱 +Pi 处理中都表现出更高的叶水势 (Ψl)。本地物种在干旱+Pi 条件下表现出较高的气体交换，而在干旱-Pi 条件下，入侵物种则表现出相同的值。干旱对入侵物种光合作用机制的光化学部分的影响比本地物种更大。入侵物种在两种干旱处理中均表现出较高的叶片氨基酸含量和较低的叶片总蛋白含量。对于测量的几个变量，这两个物种在水分胁迫下对叶片供应表现出不同的反应。此外，与本地物种相比，入侵物种在恢复期间叶片气体交换的恢复能力更强，这可能是Piuse更高效率的结果。讨论了这种行为对于这种入侵物种在半干旱环境中成功的影响。
The effects of drought stress and leaf phosphorus (Pi) supply on photosynthetic metabolism in woody tropical species are not known, and given the recent global environmental change models that forecast lower precipitation rates and periods of prolonged drought in tropical areas, this type of study is increasingly important. The effects of controlled drought stress and Pisupply on potted young plants of two woody species,Anadenanthera colubrina(native) andProsopis juliflora(invasive), were determined by analyzing leaf photosynthetic metabolism, biochemical properties and water potential. In the maximum stress, both species showed higher leaf water potential (Ψl) in the treatment drought +Piwhen compared with the respective control −Pi. The native species showed higher gas exchange under drought +Pithan under drought –Piconditions, while the invasive species showed the same values between drought +Piand −Pi. Drought affected the photochemical part of photosynthetic machinery more in the invasive species than in the native species. The invasive species showed higher leaf amino acid content and a lower leaf total protein content in both Pitreatments with drought. The two species showed different responses to the leaf Pisupply under water stress for several variables measured. In addition, the strong resilience of leaf gas exchange in the invasive species compared to the native species during the recovery period may be the result of higher efficiency of Piuse. The implications of this behavior for the success of this invasive species in semiarid environments are discussed.