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Master Thesis

Analyse des régularités structurelles morpho-anatomiques chez Cerberiopsis candelabra (Apocynaceae) endémique de Nouvelle-Calédonie

Abstract : Trees are organisms that build upon themselves over time. As a result, they often keep in their structure the trace of their past growth dynamics (e.g. rings in the wood) or scars of parts that have disappeared (e.g. leaves or branches). These morpho-anatomical markers can be used to reconstruct retrospectively the past development dynamics of the tree, if we are able to associate a temporality to them. This can be difficult in the tropics where seasonality is less pronounced than the one in temperate environments. This work focuses on the growth trajectory of Cerberiopsis candelabra, a monocarpic species endemic to New Caledonia. Our objective is to make hypotheses about the phenology of primary and secondary growth processes based on structural regularities observed in the wood, in the fluctuations of internodes length and in the arrangement of branches along the trunk. We highlight growth rings in wood marked by (i) a band of tangential parenchyma, (ii) variations in fiber wall thickness, but most importantly (iii) the alternation of "normal" and gelatinous layer wood. Our results suggest that these rings are annual and that primary growth is polycyclic with two elongation phases per year. The presence of reaction wood suggests an adaptive response to cyclones, which are very common in the region.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-03451914
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Submitted on : Friday, November 26, 2021 - 4:42:01 PM
Last modification on : Wednesday, December 8, 2021 - 3:50:32 AM

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2021_Fambart_Jade_GEFFT.pdf
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  • HAL Id : dumas-03451914, version 1

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Jade Fambart. Analyse des régularités structurelles morpho-anatomiques chez Cerberiopsis candelabra (Apocynaceae) endémique de Nouvelle-Calédonie. Sciences du Vivant [q-bio]. 2021. ⟨dumas-03451914⟩

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