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Modelling reveals endogenous osmotic adaptation of storage tissue water potential as an important driver determining different stem diameter variation patterns in the mangrove species Avicennia marina and Rhizophora stylosa
Vandegehuchte, M.W.; Guyot, A; Hubeau, M.; De Swaef, T.; Lockington, A; Steppe, K. (2014). Modelling reveals endogenous osmotic adaptation of storage tissue water potential as an important driver determining different stem diameter variation patterns in the mangrove species Avicennia marina and Rhizophora stylosa. Ann. Bot. 114(4): 667-676. dx.doi.org/10.1093/aob/mct311
In: Annals of Botany. Academic Press: London. ISSN 0305-7364, more
Peer reviewed article  

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Keywords
    Avicennia marina (Forssk.) Vierh. [WoRMS]; Rhizophora stylosa Griff. [WoRMS]; Marine; Brackish water
Author keywords
    Functional-structural modelling; Avicennia marina; Rhizophora stylosa;stem diameter variation; dendrometer; osmotic water potential;endogenous control; mangrove; plant water relations; osmotic regulation;growth; mechanistic model; sap flow

Authors  Top 
  • Vandegehuchte, M.W., more
  • Guyot, A
  • Hubeau, M., more
  • De Swaef, T., more
  • Lockington, A
  • Steppe, K., more

Abstract
    Background Stem diameter variations are mainly determined by the radial water transport between xylem and storage tissues. This radial transport results from the water potential difference between these tissues, which is influenced by both hydraulic and carbon related processes. Measurements have shown that when subjected to the same environmental conditions, the co-occurring mangrove species Avicennia marina and Rhizophora stylosa unexpectedly show a totally different pattern in daily stem diameter variation. Methods Using in situ measurements of stem diameter variation, stem water potential and sap flow, a mechanistic flow and storage model based on the cohesion–tension theory was applied to assess the differences in osmotic storage water potential between Avicennia marina and Rhizophora stylosa. Key results Both species, subjected to the same environmental conditions, showed a resembling daily pattern in simulated osmotic storage water potential. However, the osmotic storage water potential of R. stylosa started to decrease slightly after that of A. marina in the morning and increased again slightly later in the evening. This small shift in osmotic storage water potential likely underlaid the marked differences in daily stem diameter variation pattern between the two species. Conclusions The results show that in addition to environmental dynamics, endogenous changes in the osmotic storage water potential must be taken into account in order to accurately predict stem diameter variations, and hence growth.

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