Dynamique intra-annuelle de la formation du bois de trois espèces de conifères (sapin pectiné, épicéa commun et pin sylvestre) dans les Vosges : De la description des patrons saisonniers de la croissance à l'étude de l'influence de l'environnement sur la cinétique du développement cellulaire et les caractéristiques anatomiques du xylène

Abstract : Wood formation (xylogenesis) produces a large part of the biomass of this planet and provides a crucial resource to Mankind. Wood cells are produced by division in the cambium, after what they enlarge, build a lignified thick wall and die. During a year, these processes take place at certain dates, last for certain durations and go at certain rates. These dates, durations and rates characterize the intra-annual dynamics of xylogenesis. This dynamics remains poorly explored whereas it is a key aspect as it determines the quantity and quality of the produced wood and conveys the influence of intrinsic (gene, hormone) and extrinsic (environment) regulatory factors. This work aims to improve our knowledge on the intra-annual dynamics of xylogenesis. During three years (2007-2009), xylogenesis was monitored for 45 trees of three conifer species (silver fir, Norway spruce, and Scots pine) in northeast France. For that, small wood samples were collected weekly on tree stem. Samples were prepared at the laboratory, and anatomical sections were cut to observe xylogenesis under a light microscope. This thesis has improved our knowledge on the functioning of xylogenesis, a biological system of a fascinating complexity. We characterized - thanks to the development of an efficient statistical method - the little known aspects of wood cell differentiation dynamics. Based on this characterization, we eluded the mechanisms by which xylogenesis dynamics shapes tree ring structure, we established the intra-annual dynamics of carbon accumulation in wood and we evaluated the mechanisms of the climate influence on xylogenesis
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Henri Cuny. Dynamique intra-annuelle de la formation du bois de trois espèces de conifères (sapin pectiné, épicéa commun et pin sylvestre) dans les Vosges : De la description des patrons saisonniers de la croissance à l'étude de l'influence de l'environnement sur la cinétique du développement cellulaire et les caractéristiques anatomiques du xylène. Biologie végétale. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0076⟩. ⟨tel-01749846⟩

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