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Age, allocation and availability of nonstructural carbon in mature red maple trees.
MedLine Citation:
PMID:  24032647     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The allocation of nonstructural carbon (NSC) to growth, metabolism and storage remains poorly understood, but is critical for the prediction of stress tolerance and mortality. We used the radiocarbon ((14) C) 'bomb spike' as a tracer of substrate and age of carbon in stemwood NSC, CO2 emitted by stems, tree ring cellulose and stump sprouts regenerated following harvesting in mature red maple trees. We addressed the following questions: which factors influence the age of stemwood NSC?; to what extent is stored vs new NSC used for metabolism and growth?; and, is older, stored NSC available for use? The mean age of extracted stemwood NSC was 10 yr. More vigorous trees had both larger and younger stemwood NSC pools. NSC used to support metabolism (stem CO2 ) was 1-2 yr old in spring before leaves emerged, but reflected current-year photosynthetic products in late summer. The tree ring cellulose (14) C age was 0.9 yr older than direct ring counts. Stump sprouts were formed from NSC up to 17 yr old. Thus, younger NSC is preferentially used for growth and day-to-day metabolic demands. More recently stored NSC contributes to annual ring growth and metabolism in the dormant season, yet decade-old and older NSC is accessible for regrowth.
Authors:
Mariah S Carbone; Claudia I Czimczik; Trevor F Keenan; Paula F Murakami; Neil Pederson; Paul G Schaberg; Xiaomei Xu; Andrew D Richardson
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-8-27
Journal Detail:
Title:  The New phytologist     Volume:  -     ISSN:  1469-8137     ISO Abbreviation:  New Phytol.     Publication Date:  2013 Aug 
Date Detail:
Created Date:  2013-9-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust.
Affiliation:
Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, 02138, USA.
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