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Environmental conditions and vascular cambium regulate carbon allocation to xylem growth in deciduous oaks

Pérez‐de‐Lis Gonzalo, Olano José Miguel, Rozas Vicente, Rossi Sergio, Vázquez‐Ruiz Rosa Ana et García‐González Ignacio. (2017). Environmental conditions and vascular cambium regulate carbon allocation to xylem growth in deciduous oaks. Functional Ecology, 31, (3), p. 592-603.

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URL officielle: http://dx.doi.org/doi:10.1111/1365-2435.12789

Résumé

1. Environmental conditions and the structure of the dormant cambium are assumed to affect seasonal patterns of cambial activity, hence controlling allocation of non-structural carbohydrates (NSC) to growth. However, seasonal dynamics of xylogenesis, and their connections with NSC content and dormant cambium size, have been rarely assessed along an environmental gradient. 2. We monitored xylogenesis and leaf phenology during 2012 and 2013, and NSC in 2012, for the drought-sensitive Quercus robur and the drought-tolerant Quercus pyrenaica along a water-availability gradient in the north-western Iberian Peninsula, and analysed dependencies of xylem production and phenology on the number of cells in dormant cambium. 3. Study oak species showed comparable seasonal fluctuations in cambial activity and NSC content, despite Q. pyrenaica had a shorter growing season and a lower wood production than Q. robur. A sharp drop in spring NSC levels at all study sites evidenced that stored carbohydrates were crucial for earlywood formation. Under drier conditions, both species extended the growing period in spring and autumn, but reduced and even stopped xylogenesis in summer, showing an enhanced NSC accumulation before dormancy. A higher number of cells in dormant cambium of large dominant oaks accounted for their wider xylem increments and longer active periods. 4. Our study demonstrates that xylogenesis is modulated by predisposing effects of dormant cambium size on xylem production and growing season length. Moreover, the high plasticity of cambial activity in deciduous oaks would confer resistance against recurrent summer drought through the improvement of the NSC status. A lay summary is available for this article.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0269-8463
Volume:31
Numéro:3
Pages:p. 592-603
Version évaluée par les pairs:Oui
Date:2017
Identifiant unique:10.1111/1365-2435.12789
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
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
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:cambial activity, deciduous oaks, dormant cambium, drought, non-structural carbohydrates, water-availability gradient, xylogenesis
Déposé le:02 juin 2023 13:09
Dernière modification:02 juin 2023 13:09
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