BalducciCunyRathgeberEtAl2016

Référence

Balducci, L., Cuny, H.E., Rathgeber, C.B.K., Deslauriers, A., Giovannelli, A. and Rossi, S. (2016) Compensatory mechanisms mitigate the effect of warming and drought on wood formation. Plant, Cell and Environment, 39(6):1338-1352. (Scopus )

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. © 2016 John Wiley & Sons Ltd.

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@ARTICLE { BalducciCunyRathgeberEtAl2016,
    AUTHOR = { Balducci, L. and Cuny, H.E. and Rathgeber, C.B.K. and Deslauriers, A. and Giovannelli, A. and Rossi, S. },
    TITLE = { Compensatory mechanisms mitigate the effect of warming and drought on wood formation },
    JOURNAL = { Plant, Cell and Environment },
    YEAR = { 2016 },
    VOLUME = { 39 },
    NUMBER = { 6 },
    PAGES = { 1338-1352 },
    NOTE = { cited By 2 },
    ABSTRACT = { 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. © 2016 John Wiley & Sons Ltd. },
    AUTHOR_KEYWORDS = { Global warming; Tree-ring structure; Water deficit; Wood anatomy; Xylogenesis },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1111/pce.12689 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-84958818180&partnerID=40&md5=72d2f2182f52f7514f224a7d7205f5d4 },
}

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