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Effects of temperature and water deficit on cambial activity and woody ring features in Picea mariana saplings

Balducci Lorena, Deslauriers Annie, Giovannelli Alessio, Rossi Sergio et Rathgeber Cyrille B. K.. (2013). Effects of temperature and water deficit on cambial activity and woody ring features in Picea mariana saplings. Tree Physiology, 33, (10), p. 1006-1017.

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URL officielle: http://dx.doi.org/doi:10.1093/treephys/tpt073

Résumé

Increase in temperature under the projected future climate change would affect tree growth, including the physiological mechanisms related to sapling responses, which has been examined recently. The study investigated the plant water relations, cambial activity and wood formation in black spruce saplings [Picea mariana (Mill.) B.S.P.] subjected to water deficit and warming. Four-year-old saplings growing in three greenhouses were submitted to different thermal conditions: T0, with a temperature equal to the external air temperature; and T + 2 and T + 5, with temperatures set at 2 and 5 K higher than T0, respectively. We also submitted saplings to two irrigation regimes and studied the effects of a water deficit of 32 days in May-June. We evaluated plant water relations, cambial activity, wood formation and anatomical characteristics from May to October 2010. Lower needle physiology rates were observed during water deficit, with 20-day suspension of irrigation, but after re-watering, non-irrigated saplings attained the same values as irrigated ones in all thermal conditions. Significant differences between irrigation regimes were detected in cambial activity at the end of the water deficit and after resumption of irrigation. Under warmer conditions, the recovery of non-irrigated saplings was slower than T0 and they needed from 2 to 4 weeks to completely restore cambial activity. No significant differences in wood anatomy were observed between irrigation regimes, but there was a sporadic effect on wood density under warming. During wood formation, the warmer conditions combined with water deficit increased sapling mortality by 5 and 12.2% for T + 2 and T + 5, respectively. The black spruce saplings that survived were more sensitive to water availability, and the restoration of cambial activity was slower at temperatures higher than T0. Our results suggest that black spruce showed a plastic response to intense water deficit under warming, but this would compromise their survival.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0829318X (ISSN)
Volume:33
Numéro:10
Pages:p. 1006-1017
Version évaluée par les pairs:Oui
Date:2013
Sujets: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:Cambial activity, needle water relations, saplings, thermal conditions, water deficit, wood formation
Informations complémentaires:This is a pre-copyedited, author-produced version of an article accepted for publication in Tree Physiology following peer review. The version of record Balducci L, Deslauriers A, Giovannelli A, Rossi S et Rathgeber CBK. 2013. Effects of temperature and water deficit on cambial activity and woody ring features in Picea mariana saplings. Tree Physiology, 33 : 1006-1017 is available online at: http://dx.doi.org/doi:10.1093/treephys/tpt073
Déposé le:19 janv. 2017 01:22
Dernière modification:19 janv. 2017 01:22
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