Annals of Forest Science

, Volume 67, Issue 5, pp 506–506 | Cite as

Physiological variation among western redcedar (Thuja plicata Donn ex D. Don) populations in response to short-term drought

Original Article

Abstract

  • • Variation in the ability of western redcedar (Thuja plicata Donn ex D. Don) populations to withstand water stress may exist because this species is found in coastal and interior biogeoclimatic subzones representing the full range of precipitation regimes in British Columbia, Canada.

  • • Seven western redcedar populations from locations in British Columbia, representing a wide range of habitat types, were assessed for their gas exchange and water relations response to controlled drought.

  • • Before drought, population variation occurred in stomatal conductance, net CO2 assimilation rate and intrinsic water use efficiency and the relative water content at turgor loss point. During drought, populations had different responses of net CO2 assimilation to decreasing predawn shoot water potential. After drought, populations differed in stomatal conductance and intrinsic water use efficiency, plus osmotic potential at turgor loss point, osmotic potential at saturation and apparent cuticular transpiration. Western redcedar populations from drier-inland habitats had a lower osmotic potential at turgor loss point, lower relative water content at turgor loss point and lower apparent cuticular transpiration in response to drought than populations from coastal origin with temperate maritime habitat.

  • • Reduction of cuticular water loss and adjustments of cellular water relations in response to drought was found to occur among seven western redcedar populations originating along a precipitation gradient while; there were minimal population differences in the gas exchange response to drought.

Keywords

western redcedar population performance gas exchange water relations drought response 

Variations physiologiques dans des populations de thuyas géants (Thuja plicata Donn ex D. Don) en réponse à une sécheresse courte

Résumé

  • • Les variations de capacité à résister au déficit hydrique dans des populations de thuyas géants (Thuja plicata Donn Ex D. Don) apparaissent parce que cette espèce se rencontre dans les sous-zones biogéoclimatiques côtières et de l’intérieur représentant l’éventail complet de régimes de précipitations en Colombie britannique (Canada).

  • • Sept populations de thuyas géants issues de sites de Colombie britannique, représentant un large éventail des types d’habitats, ont été évaluées pour leurs échanges gazeux et leurs relations hydriques en réponse à une sécheresse contrôlée.

  • • Avant la sécheresse, une variabilité existait entre populations pour la conductance stomatique, l’assimilation nette de CO2, l’efficience intrinsèque d’utilisation de l’eau et la teneur relative en eau au point de perte de turgescence. Pendant la sécheresse, les populations ont présenté des réponses différentes de l’assimilation nette de CO2 à la baisse du potentiel hydrique de base. Après la sécheresse, les populations différaient en conductance stomatique et efficience intrinsèque d’utilisation de l’eau, mais également en potentiel osmotique au point de perte de turgescence, en potentiel osmotique à saturation et en transpiration cuticulaire apparente. Les populations de thuyas géants des habitats intérieurs les plus secs présentaient un plus faible potentiel osmotique au point de perte de turgescence, une plus faible teneur en eau au point de perte de turgescence et une plus faible transpiration cuticulaire apparente en réponse à la sécheresse que les populations d’origine côtière avec un habitat maritime tempéré.

  • • Une réduction des pertes d’eau cuticulaires et des ajustements des relations hydriques cellulaires en réponse à la sécheresse ont été trouvés parmi sept populations de thuyas géants originaires de sites se trouvant le long d’un gradient de précipitations, alors qu’il n’y avait que de faibles différences entre populations pour la réponse des échanges gazeux à la sécheresse.

Mots-clés

performances de populations de thuyas géants échanges gazeux relations hydriques réponse à la sécheresse 

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Copyright information

© Springer S+B Media B.V. 2010

Authors and Affiliations

  1. 1.CellFor Inc.SaanichtonCanada
  2. 2.Cowichan Lake Research StationBC Ministry of Forests and RangeMesachie LakeCanada

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