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Compensatory mechanisms mitigate the effect of warming and drought on wood formation

Balducci Lorena, Cuny Henri E., Rathgeber Cyrille B. K., Deslauriers Annie, Giovannelli Alessio et Rossi Sergio. (2016). Compensatory mechanisms mitigate the effect of warming and drought on wood formation. Plant, Cell and Environment, 39, (6), p. 1338-1352.

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URL officielle: http://dx.doi.org/doi:10.1111/pce.12689

Résumé

Because of global warming, high-latitude ecosystems are expected to experience increases in temperature and drought events. Wood formation will have to adjust to these new climatic constraints to maintain tree mechanical stability and long-distance water transport. The aim of this study is to understand the dynamic processes involved in wood formation under warming and drought. Xylogenesis, gas exchange, water relations and wood anatomy of black spruce [Picea mariana (Mill.) B.S.P.] saplings were monitored during a greenhouse experiment where temperature was increased during daytime or night-time (+6°C) combined with a drought period. The kinetics of tracheid development expressed as rate and duration of the xylogenesis sub-processes were quantified using generalized additive models. Drought and warming had a strong influence on cell production, but little effect on wood anatomy. The increase in cell production rate under warmer temperatures, and especially during the night-time warming at the end of the growing season, resulted in wider tree-rings. However, the strong compensation between rates and durations of cell differentiation processes mitigates warming and drought effects on tree-ring structure. Our results allowed quantification of how wood formation kinetics is regulated when water and heat stress increase, allowing trees to adapt to future environmental conditions.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:01407791 (ISSN)
Volume:39
Numéro:6
Pages:p. 1338-1352
Version évaluée par les pairs:Non
Date:2016
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:global warming, tree-ring structure, water deficit, wood anatomy, xylogenesis
Informations complémentaires:This is the pre-peer reviewed version of the following article: Balducci L, Cuny HE, Rathgeber CBK, Deslauriers A, Giovannelli A et Rossi S. 2016. Compensatory mechanisms mitigate the effect of warming and drought on wood formation. Plant, Cell and Environment, 39 : 1338-1352, which has been published in final form at http://dx.doi.org/doi:10.1111/pce.12689. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Déposé le:16 déc. 2016 03:06
Dernière modification:16 déc. 2016 03:06
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