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Impact of warming and drought on carbon balance related to wood formation in black spruce

Deslauriers Annie, Beaulieu Marilène, Balducci Lorena, Giovannelli Alessio, Gagnon Michel J. et Rossi Sergio. (2014). Impact of warming and drought on carbon balance related to wood formation in black spruce. Annals of Botany, 114, (2), p. 335-345.

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Background and Aims Wood formation in trees represents a carbon sink that can be modified in the case of stress. The way carbon metabolism constrains growth during stress periods (high temperature and water deficit) is now under debate. In this study, the amounts of non-structural carbohydrates (NSCs) for xylogenesis in black spruce, Picea mariana, saplings were assessed under high temperature and drought in order to determine the role of sugar mobilization for osmotic purposes and its consequences for secondary growth.

Methods Four-year-old saplings of black spruce in a greenhouse were subjected to different thermal conditions with respect to the outside air temperature (T0) in 2010 (2 and 5 °C higher than T0) and 2011 (6 °C warmer than T0 during the day or night) with a dry period of about 1 month in June of each year. Wood formation together with starch, NSCs and leaf parameters (water potential and photosynthesis) were monitored from May to September.

Key Results With the exception of raffinose, the amounts of soluble sugars were not modified in the cambium even if gas exchange and photosynthesis were greatly reduced during drought. Raffinose increased more than pinitol under a pre-dawn water potential of less than -1 Mpa, presumably because this compound is better suited than polyol for replacing water and capturing free radicals, and its degradation into simple sugar is easier. Warming decreased the starch storage in the xylem as well the available hexose pool in the cambium and the xylem, probably because of an increase in respiration.

Conclusions Radial stem growth was reduced during drought due to the mobilization of NSCs for osmotic purposes and due to the lack of cell turgor. Thus plant water status during wood formation can influence the NSCs available for growth in the cambium and xylem.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:03057364 (ISSN)
Pages:p. 335-345
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, black spruce, Picea mariana, drought, non-structural carbohydrate, soluble sugars, raffinose, starch, global warming, climate change, wood formation, xylogenesis
Informations complémentaires:This is a pre-copyedited, author-produced PDF of an article accepted for publication in Annals of Botany following peer review. The version of record "Deslauriers A, Beaulieu M, Balducci L, Giovannelli A, Gagnon MJ et Rossi S. 2014. Impact of warming and drought on carbon balance related to wood formation in black spruce. Annals of Botany, 114 : 335-345" is available online at:
Déposé le:08 juin 2016 15:33
Dernière modification:05 déc. 2016 20:33
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