Document Detail


Variations in dark respiration and mitochondrial numbers within needles of Pinus radiata grown in ambient or elevated CO2 partial pressure.
MedLine Citation:
PMID:  14704144     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Within-leaf variations in cell size, mitochondrial numbers and dark respiration rates were compared in the most recently expanded tip, the mid-section and base of needles of Pinus radiata D. Don trees grown for 4 years in open-top chambers at ambient (36 Pa) or elevated (65 Pa) carbon dioxide partial pressure (p(CO2)a). Mitochondrial numbers and respiratory activity varied along the length of the needle, with the highest number of mitochondria per unit cytoplasm and the highest rate of respiration per unit leaf area at the base of the needle. Regardless of the location of the cells (tip, middle or basal sections), needles collected from trees grown in elevated p(CO2)a had nearly twice the number of mitochondria per unit cytoplasm as those grown in ambient p(CO2)a. This stimulation of mitochondrial density by growth at elevated p(CO2)a was greater at the tip of the needle (2.7 times more mitochondria than in needles grown in ambient CO2) than at the base of the needle (1.7 times). The mean size of individual mitochondria was unaffected either by growth at elevated p(CO2)a or by position along the needle. Tree growth at elevated p(CO2)a had a variable effect on respiration per unit leaf area, significantly increasing respiration in the tip of the needles (+25%) and decreasing respiration at the mid-section and base of the needles (-14% and -25%, respectively). Although a simple relationship between respiration per unit leaf area and mitochondrial number per unit cytoplasm was found within each CO2 treatment, the variable effect of growth at elevated p(CO2)a on respiration along the length of the needles indicates that a more complex relationship must determine the association between structure and function in these needles.
Authors:
Kevin L Griffin; O Roger Anderson; David T Tissue; Matthew H Turnbull; David Whitehead
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Tree physiology     Volume:  24     ISSN:  0829-318X     ISO Abbreviation:  Tree Physiol.     Publication Date:  2004 Mar 
Date Detail:
Created Date:  2004-01-05     Completed Date:  2005-11-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100955338     Medline TA:  Tree Physiol     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  347-53     Citation Subset:  IM    
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA. griff@LDEO.columbia.edu
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MeSH Terms
Descriptor/Qualifier:
Carbon Dioxide / physiology
Cell Respiration / physiology*
Mitochondria / physiology*,  ultrastructure
Pinus / physiology*
Plant Leaves / physiology*,  ultrastructure
Trees / physiology*
Chemical
Reg. No./Substance:
124-38-9/Carbon Dioxide

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


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