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Source of nitrogen associated with recovery of relative growth rate in Arabidopsis thaliana acclimated to sustained cold treatment

Atkinson, Lindsey J.; Sherlock, David J.; Atkin, Owen K.

Authors

Lindsey J. Atkinson

David J. Sherlock

Owen K. Atkin

Abstract

To determine (1) whether acclimation of carbon metabolism to low temperatures results in recovery of the relative growth rate (RGR) of plants in the cold and (2) the source of N underpinning cold-acclimation in Arabidopsis thaliana, we supplied plants with a nutrient solution labelled with 15N and subjected them to a temperature shift (23oC to 5oC). Whole-plant RGR of cold-treated plants was initially less than 30% of that of warm-maintained control plants. After 14 days, new leaves with a cold-acclimated phenotype emerged, with the RGR of cold-treated plants increasing by 50%; there was an associated recovery of root RGR and doubling of the net assimilation rate (NAR). The development of new tissues in the cold was supported initially by re-allocation of internal sources of N. In the longer-term, the majority (80%) of N in new leaves was derived from the external solution. Hence, both the nutrient status of the plant and the current availability of N from external sources are important in determining recovery of growth at low temperature. Collectively, our results reveal that both increased N use efficiency and increases in nitrogen content per se play a role in the recovery of carbon metabolism in the cold.

Journal Article Type Article
Publication Date 2015-06
Journal Plant cell & environment
Print ISSN 0140-7791
Electronic ISSN 1365-3040
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 38
Issue 6
Pages 1023-1034
DOI https://doi.org/10.1111/pce.12460
Keywords Acclimation; Arabidopsis; Low temperature; Nitrogen uptake; Relative growth rate; Specific leaf area
Publisher URL http://onlinelibrary.wiley.com/doi/10.1111/pce.12460/abstract
Copyright Statement © 2015 The University of Hull
Additional Information Author's accepted manuscript of article published in: Plant cell & environment, 2015, v.38, issue 6.

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