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JXB Advance Access published online on November 1, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri300
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received July 1, 2005
Accepted August 26, 2005

RESEARCH PAPER

Oxygen isotope enrichment ({Delta}18O) as a measure of time-averaged transpiration rate

M. S. Sheshshayee 1*, H. Bindumadhava 1, R. Ramesh 2, T. G. Prasad 1, M. R. Lakshminarayana 3, and M. Udayakumar 1

1 Department of Crop Physiology, University of Agricultural Sciences, GKVK Campus, Bangalore 560065, India
2 Planetary and Geosciences Division, Physical Research Laboratory, Ahmedabad, 380 009, India
3 Department of Physics, University of Agricultural Sciences, GKVK Campus, Bangalore 560065, India

* To whom correspondence should be addressed.
M. S. Sheshshayee, E-mail: msheshshayee{at}hotmail.com


  Abstract

Experimental evidence is presented to show that the 18O enrichment in the leaf biomass and the mean (time-averaged) transpiration rate are positively correlated in groundnut and rice genotypes. The relationship between oxygen isotope enrichment and stomatal conductance (gs) was determined by altering gs through ABA and subsequently using contrasting genotypes of cowpea and groundnut. The Peclet model for the 18O enrichment of leaf water relative to the source water is able to predict the mean observed values well, while it cannot reproduce the full range of measured isotopic values. Further, it fails to explain the observed positive correlation between transpiration rate and 18O enrichment in leaf biomass. Transpiration rate is influenced by the prevailing environmental conditions besides the intrinsic genetic variability. As all the genotypes of both species experienced similar environmental conditions, the differences in transpiration rate could mostly be dependent on intrinsic gs. Therefore, it appears that the {Delta}18O of leaf biomass can be used as an effective surrogate for mean transpiration rate. Further, at a given vapour pressure difference, {Delta}18O can serve as a measure of stomatal conductance as well.

Keywords: ABA; groundnut; mean transpiration rate; 18O enrichment; rice; stomatal conductance.
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