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Plastic response of tracheids in Pinus pinaster in a water-limited environment : adjusting lumen size instead of wall thickness

Carvalho Ana, Nabais Cristina, Vieira Joana, Rossi Sergio et Campelo Filipe. (2015). Plastic response of tracheids in Pinus pinaster in a water-limited environment : adjusting lumen size instead of wall thickness. PLoS ONE, 10, (8), p. 1-14.

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URL officielle: http://dx.doi.org/doi:10.1371/journal.pone.0136305

Résumé

The formation of wood results from cambial activity and its anatomical properties reflect the variability of environmental conditions during the growing season. Recently, it was found that wood density variations in conifers growing under cold-limited environment result from the adjustment of cell wall thickness (CWT) to temperature. Additionally, it is known that intra-annual density fluctuations (IADFs) are formed in response to precipitation after the summer drought. Although IADFs are frequent in Mediterranean conifers no study has yet been conducted to determine if these structures result from the adjustment of lumen diameter (LD) or CWT to soil water availability. Our main objective is to investigate the intra-ring variation of wood anatomical features (LD and CWT) in Pinus pinaster Ait. growing under a water-limited environment. We compared the tracheidograms of LD and CWT for the years 2010-2013 in P. pinaster growing in the west coast of Portugal. Our results suggest a close association between LD and soil moisture content along the growing season, reinforcing the role of water availability in determining tracheid size. Compared with CWT, LD showed a higher intra- and inter-annual variability suggesting its strong adjustment value to variations in water availability. The formation of a latewood IADF appears to be predisposed by higher rates of cell production in spring and triggered by early autumn precipitation. Our findings reinforce the crucial role of water availability on cambial activity and wood formation in Mediterranean conifers, and emphasize the high plasticity of wood anatomical features under Mediterranean climate.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:10
Numéro:8
Pages:p. 1-14
Version évaluée par les pairs:Oui
Date:2015
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:wood formation, cambial activity, Pinus pinaster, water
Déposé le:10 févr. 2017 01:20
Dernière modification:10 févr. 2017 01:20
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