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Will intra-specific differences in transpiration efficiency in wheat be maintained in a high CO(2) world? - A FACE study.
MedLine Citation:
PMID:  23035842     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
This study evaluates whether the target breeding trait of superior leaf level transpiration efficiency is still appropriate under increasing carbon dioxide levels of a future climate using a semi-arid cropping system as a model. Specifically, we investigated whether physiological traits governing leaf level transpiration efficiency, such as net assimilation rates (A(net) ), stomatal conductance (g(s) ), or stomatal sensitivity were affected differently between two Triticum aestivum L. cultivars differing in transpiration efficiency (cv. Drysdale, superior; cv. Hartog, low). Plants were grown under Free Air Carbon dioxide Enrichment (FACE, ~550 µmol mol(-1) or ambient CO(2) concentrations (~390 µmol mol(-1) ). Mean A(net) (~15% increase) and g(s) (~25% decrease) were less affected by elevated [CO(2) ] than previously found in FACE-grown wheat (~25% increase and ~32% decrease, respectively), potentially reflecting growth in a dry-land cropping system. In contrast to previous FACE studies, analyses of the Ball et al. model revealed an elevated [CO(2) ] effect on the slope of the linear regression by 12% indicating a decrease in stomatal sensitivity to the combination of [CO(2) ], photosynthesis rate and humidity. Differences between cultivars indicated greater transpiration efficiency for Drysdale with growth under elevated [CO(2) ] potentially increasing the response of this trait. This knowledge adds valuable information for crop germplasm improvement for future climates.
Authors:
Sabine Tausz-Posch; Robert M Norton; Saman Seneweera; Glenn J Fitzgerald; Michael Tausz
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-5
Journal Detail:
Title:  Physiologia plantarum     Volume:  -     ISSN:  1399-3054     ISO Abbreviation:  Physiol Plant     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1256322     Medline TA:  Physiol Plant     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © Physiologia Plantarum 2012.
Affiliation:
Department of Agriculture and Food Systems, The University of Melbourne, 4 Water Street, Creswick, VIC 3363, Australia.
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