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Successive cambia: A developmental oddity or an adaptive structure?
Robert, E.M.R.; Schmitz, N.; Boeren, I.; Driessens, T.; Herremans, H.; De Mey, J.; Van de Casteele, E.; Beeckman, H.; Koedam, N. (2011). Successive cambia: A developmental oddity or an adaptive structure? PLoS One 6(1): e16558 + suppl. dx.doi.org/10.1371/journal.pone.0016558
In: PLoS One. Public Library of Science: San Francisco. ISSN 1932-6203; e-ISSN 1932-6203
Peer reviewed article  
Available in  Authors 
Keyword
    Marine/Coastal
Authors  Top 
  • Robert, E.M.R.
  • Schmitz, N.
  • Boeren, I.
  • Driessens, T.
  • Herremans, H.
  • De Mey, J.
  • Van de Casteele, E.
  • Beeckman, H.
  • Koedam, N.
Abstract
    BackgroundSecondary growth by successive cambia is a rare phenomenon in woody plant species. Only few plant species, within different phylogenetic clades, have secondary growth by more than one vascular cambium. Often, these successive cambia are organised concentrically. In the mangrove genus Avicennia however, the successive cambia seem to have a more complex organisation. This study aimed (i) at understanding the development of successive cambia by giving a three-dimensional description of the hydraulic architecture of Avicennia and (ii) at unveiling the possible adaptive nature of growth by successive cambia through a study of the ecological distribution of plant species with concentric internal phloem.ResultsAvicennia had a complex network of non-cylindrical wood patches, the complexity of which increased with more stressful ecological conditions. As internal phloem has been suggested to play a role in water storage and embolism repair, the spatial organisation of Avicennia wood could provide advantages in the ecologically stressful conditions species of this mangrove genus are growing in. Furthermore, we could observe that 84.9% of the woody shrub and tree species with concentric internal phloem occurred in either dry or saline environments strengthening the hypothesis that successive cambia provide the necessary advantages for survival in harsh environmental conditions.ConclusionsSuccessive cambia are an ecologically important characteristic, which seems strongly related with water-limited environments.
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