Foliar Water Uptake Supports Water Potential Recovery but Does Not Affect Xylem Sap Composition in Two Salt-Secreting Mangroves.

IF 6 1区生物学 Q1 PLANT SCIENCES

Plant, Cell & Environment Pub Date : 2024-12-16 DOI:10.1111/pce.15332

Adriano Losso, Alice Gauthey, Stefan Mayr, Brendan Choat

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引用次数: 0

Abstract

Mangroves are highly salt-tolerant species, which live in saline intertidal environments, but rely on alternative, less saline water to maintain hydraulic integrity and plant productivity. Foliar water uptake (FWU) is thought to assist in hydration of mangroves, particularly during periods of acute water deficit. We investigated the dynamics of FWU in Avicennia marina and Aegiceras corniculatum by submerging and spraying excised branches and measuring leaf water potential (Ψ) at different time intervals. Daily changes in xylem sap composition (ionic concentrations, pH and surface tension) were monitored during 2 days characterised by the presence of morning dew and difference in tides. In both species, FWU occurred over relatively short times, with leaf Ψ recovering from -4.5 MPa to about -1.5 MPa in 120-150 min. At predawn, Ψ was higher (-1.5 MPa) than sea water Ψ, indicating that leaves had been partially rehydrated by absorbed dew. Tides did not affect Ψ, but high tides increased the overall ionic content of xylem sap. The results indicated mangroves are extremely efficient in absorbing non-saline water via the leaves and restoring the water balance to Ψ higher than seawater. Changes in xylem sap composition, which were strongly influenced by tides, were not affected by observed FWU.

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红树林是高度耐盐的物种，生活在含盐的潮间带环境中，但依靠盐度较低的替代水维持水力完整性和植物生产力。叶面吸水（FWU）被认为有助于红树林的水合作用，尤其是在严重缺水时期。我们通过浸没和喷洒切除的枝条，并在不同时间间隔测量叶片水势（Ψ），研究了 Avicennia marina 和 Aegiceras corniculatum 的叶面吸水动态。在有晨露和潮汐差异的两天内，监测木质部汁液成分（离子浓度、pH 值和表面张力）的每日变化。在这两种植物中，FWU发生的时间相对较短，叶片Ψ在120-150分钟内从-4.5兆帕恢复到约-1.5兆帕。黎明前，Ψ比海水Ψ高（-1.5 兆帕），表明叶片已被吸收的露水部分补水。潮汐对Ψ没有影响，但涨潮会增加木质部汁液的整体离子含量。结果表明，红树林能非常有效地通过叶片吸收非盐水，并将水分平衡恢复到高于海水的Ψ。木质部汁液成分的变化受潮汐的影响很大，但不受观测到的 FWU 的影响。

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来源期刊

Plant, Cell & Environment 生物-植物科学

CiteScore

13.30

自引率

4.10%

发文量

253

审稿时长

1.8 months

期刊介绍： Plant, Cell & Environment is a premier plant science journal, offering valuable insights into plant responses to their environment. Committed to publishing high-quality theoretical and experimental research, the journal covers a broad spectrum of factors, spanning from molecular to community levels. Researchers exploring various aspects of plant biology, physiology, and ecology contribute to the journal's comprehensive understanding of plant-environment interactions.