The Contribution of Carbon and Water in Modulating Wood Formation in Black Spruce Saplings
Autor: | Lorena Balducci, Jianguo Huang, Annie Deslauriers, Sergio Rossi, Marilène Beaulieu |
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Rok vydání: | 2016 |
Předmět: |
0106 biological sciences
Plant growth Sucrose Physiology Carbohydrates chemistry.chemical_element Plant Science Models Biological 010603 evolutionary biology 01 natural sciences Trees chemistry.chemical_compound Xylem Botany Genetics Picea Cambium Sugar fungi Temperature Water Cell Differentiation Articles Meristem Wood Black spruce Carbon Solubility chemistry 010606 plant biology & botany |
Zdroj: | Plant Physiology. 170:2072-2084 |
ISSN: | 1532-2548 0032-0889 |
Popis: | 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 r(2) 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 r(2) 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. |
Databáze: | OpenAIRE |
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