Journal of Experimental Botany, Vol. 51, No. 342, pp. 41-50,
January 2000
© 2000 Oxford University Press
Using stable isotope natural abundances (
15N and 13C) to integrate the stress responses of wild barley (Hordeum spontaneum C. Koch.) genotypes
Scottish Crop Research Institute, Dundee DD2 5DA, UK
To integrate the complex physiological responses of plants to stress, natural abundances (
) of the stable isotope pairs 15N/14N and 13C/12C were measured in 30 genotypes of wild barley (Hordeum spontaneum C. Koch.). These accessions, originating from ecologically diverse sites, were grown in a controlled environment and subjected to mild, short-term drought or N-starvation. Increases in total dry weight were paralleled by less negative 13C in shoots and, in unstressed and droughted plants, by less negative whole-plant 13C. Root 15N was correlated negatively with total dry weight, whereas shoot and whole-plant 15N were not correlated with dry weight. The difference in 15N between shoot and root varied with stress in all genotypes. Shoot–root 15N may be a more sensitive indicator of stress response than shoot, root or whole-plant 15N alone. Among the potentially most productive genotypes, the most stress-tolerant had the most negative whole-plant 15N, whether the stress was drought or N-starvation. In common, controlled experiments, genotypic differences in whole-plant 15N may reflect the extent to which N can be retained within plants when stressed.
Key words:
hordeum spontaneum, 13C, 15N, stress, drought, nitrogen
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