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The contribution of carbon and water in modulating wood formation in black spruce saplings

Deslauriers Annie, Huang Jian-Guo, Balducci Lorena, Beaulieu Marilène et Rossi Sergio. (2016). The contribution of carbon and water in modulating wood formation in black spruce saplings. Plant Physiology, 170, (4), p. 2072-2084.

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Nonstructural carbohydrates (NSCs) play a crucial role in xylem formation and represent, with water, the main constraint to plant growth. We assessed the relationships between xylogenesis and NSCs in order to (1) verify the variance explained by NSCs and (2) determine the influence of intrinsic (tissue supplying carbon) and extrinsic (water availability and temperature) factors. During 2 years, wood formation was monitored in saplings of black spruce (Picea mariana) subjected to a dry period of about 1 month in June and exposed to different temperature treatments in a greenhouse. In parallel, NSC concentrations were determined by extracting the sugar compounds from two tissues (cambium and inner xylem), both potentially supplying carbon for wood formation. A mixed-effect model was used to assess and quantify the potential relationships. Total xylem cells, illustrating meristematic activity, were modeled as a function of water, sucrose, and D-pinitol (conditional r2 of 0.79). Water availability was ranked as the most important factor explaining total xylem cell production, while the contribution of carbon was lower. Cambium stopped dividing under water deficit, probably to limit the number of cells remaining in differentiation without an adequate amount of water. By contrast, carbon factors were ranked as most important in explaining the variation in living cells (conditional r2 of 0.49), highlighting the functional needs during xylem development, followed by the tissue supplying the NSCs (cambium) and water availability. This study precisely demonstrates the role of carbon and water in structural growth expressed as meristematic activity and tissue formation.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:00320889 (ISSN)
Pages:p. 2072-2084
Version évaluée par les pairs:Oui
Sujets:Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:Cambium, cell enlargement, cell wall thickening, drought, temperature, non-structural soluble sugars, source-sink relationships
Déposé le:08 juin 2016 17:17
Dernière modification:05 déc. 2016 20:29
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