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Modulation of respiratory metabolism in response to nutrient changes along a soil chronosequence.
MedLine Citation:
PMID:  23210522     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Laboratory studies indicate that plant respiratory efficiency may decrease in response to low nutrient availability, due to increased partitioning of electrons to the energy-wasteful alternative oxidase (AOX). Field confirmation of this hypothesis is lacking, however. We therefore investigated plant respiratory changes associated with succession and retrogression in soils aged from 10 to 120,000 years along the Franz Josef soil chronosequence, New Zealand. Respiration rates and electron partitioning were determined based on oxygen isotopic fractionation. Leaf structural traits, foliar nutrient status, carbohydrates and species composition were measured as explanatory variables. Although soil nutrients levels and species composition varied by site along the chronosequence, foliar respiration across all sites and species corresponded strongly with leaf nitrogen concentration (r(2) = 0.8). In contrast, electron partitioning declined with increasing nitrogen/phosphorus (r(2) = 0.23), and AOX activity correlated with phosphorus (r(2) = 0.64). Independently, total respiration was further associated with foliar Cu, possibly linked to its effect on AOX. Independent control of AOX and cytochrome pathway activities is also discussed. These responses of plant terminal respiratory oxidases - and therefore respiratory carbon efficiency - to multiple nutrient deficiencies demonstrate that modulation of respiratory metabolism may play an important role in plant responses to nutrient gradients.
Authors:
Ari Kornfeld; Owen K Atkin; Kevin L Griffin; Travis W Horton; Dan Yakir; Matthew H Turnbull
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-5
Journal Detail:
Title:  Plant, cell & environment     Volume:  -     ISSN:  1365-3040     ISO Abbreviation:  Plant Cell Environ.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9309004     Medline TA:  Plant Cell Environ     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 Blackwell Publishing Ltd.
Affiliation:
School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, 8140, New Zealand.
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