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Cambial phenology, wood formation and temperature thresholds in two contrasting years at high altitude in Southern Italy

Deslauriers Annie, Rossi Sergio, Anfodillo Tommaso et Saracino Antonio. (2008). Cambial phenology, wood formation and temperature thresholds in two contrasting years at high altitude in Southern Italy. Tree Physiology, 28, (6), p. 863-871.

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Xylogenesis was monitored during 2003 and 2004 in a timberline environment in southern Italy to assess links between temperature, cambial phenology and wood formation on a short-time scale. Wood microcores were collected weekly from May to October from 10 trees of Pinus leucodermis Ant., histological sections were cut with a rotary microtome and anatomical features of the developing and mature tracheids were observed and measured along the growing tree ring. Spring 2003 was hotter than spring 2004, with temperatures up to 2.6°C above historical means. The hotter conditions resulted in an earlier onset of cambial activity and all differentiation phases of about 20 days, resulting in an increased duration of xylogenesis of about 23 days. Air and stem temperatures at which xylogenesis had a 0.5 probability of being active were calculated with logistic regressions fitted on binary responses. In both years, similar thresholds were estimated with daily mean values of 8.2 and 9.5°C for air and stem temperatures, respectively. The observed convergent responses of cambium phenology to temperature during the two contrasting springs confirm the key role of this environmental factor in determining the onset and duration of wood formation in timberline areas. The intra-annual dynamics of ring-width increase differed between years, with significantly narrower rings formed in 2004 than in 2003. These differences were mainly related to cell size because larger early wood tracheids were produced in 2003. This study demonstrates the plasticity of tree-ring formation in response to high temperatures as a result of modifications in the onset and duration of differentiation.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0829318X (ISSN)
Pages:p. 863-871
Version évaluée par les pairs:Oui
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, cell differentiation, cell production, Pinus leucodermis, temperature, tree-ring width rain altitude cell organelle coniferous tree environmental factor high temperature histology phenology tree ring treeline wood article cell division cell wall climate cytology growth, development and aging Italy meteorological phenomena physiology time tree ultrastructure xylem Meteorological Factors Time Factors Trees Eurasia Europe Southern Europe Pinus heldreichii
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 Deslauriers A, Rossi S, Anfodillo T et Saracino A. 2008. Cambial phenology, wood formation and temperature thresholds in two contrasting years at high altitude in Southern Italy. Tree Physiology, 28 : 863-871 is available online at:
Déposé le:07 févr. 2017 02:20
Dernière modification:01 déc. 2017 01:24
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