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Hydraulic redistribution of foliar absorbed water causes turgor-driven growth in mangrove seedlings
Schreel, J.D.M.; Van de Wal, B.A.E.; Hervé‐Fernandez, P.; Boeckx, P.; Steppe, K. (2019). Hydraulic redistribution of foliar absorbed water causes turgor-driven growth in mangrove seedlings. Plant Cell Environ. 42(8): 2437-2447.
In: Plant, Cell and Environment. Blackwell: Oxford. ISSN 0140-7791; e-ISSN 1365-3040, more
Peer reviewed article  

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Author keywords
    deuterium; drought; foliar absorption; foliar water uptake; mangroves;plant-water relations; sap flow; stable isotopes; stem diametervariations; turgor-driven radial stem growth

Authors  Top 
  • Schreel, J.D.M., more
  • Van de Wal, B.A.E., more
  • Hervé-Fernandez, P., more

    Although foliar water uptake (FWU) has been shown in mature Avicennia marina trees, the importance for its seedlings remains largely unknown. A series of experiments were therefore performed using artificial rainfall events in a greenhouse environment to assess the ecological implications of FWU in Amarina seedlings. One‐hour artificial rainfall events resulted in an increased leaf water potential, a reversed sap flow, and a rapid diameter increment signifying a turgor‐driven growth of up to 30.1 ± 5.4 μm. Furthermore, the application of an artificial rainfall event with deuterated water showed that the amount of water absorbed by the leaves and transported to the stem was directly and univocally correlated to the observed growth spurts. The observations in this process‐based study show that FWU is an important water acquisition mechanism under certain circumstances and might be of ecological importance for the establishment of Amarina seedlings. Distribution of mangrove trees might hence be more significantly disturbed by climate change‐driven changes in rainfall patterns than previously assumed.

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