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JXB Advance Access published online on February 26, 2009
Journal of Experimental Botany, doi:10.1093/jxb/erp028
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© 2009 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Water and nitrogen conditions affect the relationships of {Delta}13C and {Delta}18O to gas exchange and growth in durum wheat

Llorenç Cabrera-Bosquet1, Gemma Molero1, Salvador Nogués1 and José Luis Araus2,*

1Unitat de Fisiologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain
2International Maize and Wheat Improvement Center (CIMMYT), El Batán, Mexico

* To whom correspondence should be addressed. E-mail: j.araus{at}cgiar.org

Whereas the effects of water and nitrogen (N) on plant {Delta}13C have been reported previously, these factors have scarcely been studied for {Delta}18O. Here the combined effect of different water and N regimes on {Delta}13C, {Delta}18O, gas exchange, water-use efficiency (WUE), and growth of four genotypes of durum wheat [Triticum turgidum L. ssp. durum (Desf.) Husn.] cultured in pots was studied. Water and N supply significantly increased plant growth. However, a reduction in water supply did not lead to a significant decrease in gas exchange parameters, and consequently {Delta}13C was only slightly modified by water input. Conversely, N fertilizer significantly decreased {Delta}13C. On the other hand, water supply decreased {Delta}18O values, whereas N did not affect this parameter. {Delta}18O variation was mainly determined by the amount of transpired water throughout plant growth (Tcum), whereas {Delta}13C variation was explained in part by a combination of leaf N and stomatal conductance (gs). Even though the four genotypes showed significant differences in cumulative transpiration rates and biomass, this was not translated into significant differences in {Delta}18Os. However, genotypic differences in {Delta}13C were observed. Moreover, ~80% of the variation in biomass across growing conditions and genotypes was explained by a combination of both isotopes, with {Delta}18O alone accounting for ~50%. This illustrates the usefulness of combining {Delta}18O and {Delta}13C in order to assess differences in plant growth and total transpiration, and also to provide a time-integrated record of the photosynthetic and evaporative performance of the plant during the course of crop growth.

Key words: {Delta}13C and {Delta}18O, leaf gas exchange, water and nitrogen limitation, wheat, WUE

Received 4 October 2008; Revised 5 January 2009 Accepted 26 January 2009


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L. Cabrera-Bosquet, C. Sanchez, and J. L. Araus
How yield relates to ash content, {Delta}13C and {Delta}18O in maize grown under different water regimes
Ann. Bot., November 1, 2009; 104(6): 1207 - 1216.
[Abstract] [Full Text] [PDF]


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