Document Detail

Conifers in cold environments synchronize maximum growth rate of tree-ring formation with day length.
MedLine Citation:
PMID:  16608455     Owner:  NLM     Status:  MEDLINE    
Intra-annual radial growth rates and durations in trees are reported to differ greatly in relation to species, site and environmental conditions. However, very similar dynamics of cambial activity and wood formation are observed in temperate and boreal zones. Here, we compared weekly xylem cell production and variation in stem circumference in the main northern hemisphere conifer species (genera Picea, Pinus, Abies and Larix) from 1996 to 2003. Dynamics of radial growth were modeled with a Gompertz function, defining the upper asymptote (A), x-axis placement (beta) and rate of change (kappa). A strong linear relationship was found between the constants beta and kappa for both types of analysis. The slope of the linear regression, which corresponds to the time at which maximum growth rate occurred, appeared to converge towards the summer solstice. The maximum growth rate occurred around the time of maximum day length, and not during the warmest period of the year as previously suggested. The achievements of photoperiod could act as a growth constraint or a limit after which the rate of tree-ring formation tends to decrease, thus allowing plants to safely complete secondary cell wall lignification before winter.
Sergio Rossi; Annie Deslauriers; Tommaso Anfodillo; Hubert Morin; Antonio Saracino; Renzo Motta; Marco Borghetti
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The New phytologist     Volume:  170     ISSN:  0028-646X     ISO Abbreviation:  New Phytol.     Publication Date:  2006  
Date Detail:
Created Date:  2006-04-12     Completed Date:  2006-06-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  England    
Other Details:
Languages:  eng     Pagination:  301-10     Citation Subset:  IM    
Treeline Ecology Research Unit, Department TeSAF, University of Padova, viale dell'Università 16, 35020 Legnaro (PD), Italy.
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MeSH Terms
Cold Climate*
Coniferophyta / growth & development*,  physiology
Plant Stems / anatomy & histology,  growth & development*
Regression Analysis

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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