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Journal of Experimental Botany, Vol. 53, No. 375, pp. 1765-1770, August 1, 2002
© 2002 Oxford University Press

Does shoot water status limit leaf expansion of nitrogen-deprived barley?

Received 8 November 2001; Accepted 26 April 2002

I. C. Dodd3,1, Rana Munns2 and J. B. Passioura2

1 Department of Botany, University of Queensland, Brisbane, QLD 4072, Australia
2 CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia

3 To whom correspondence should be addressed at Department of Biological Sciences, IENS, University of Lancaster, Lancaster LA1 4YQ, UK. Fax: +44 (0)1524 843854. E-mail: I.Dodd{at}lancaster.ac.uk

The role of shoot water status in mediating the decline in leaf elongation rate of nitrogen (N)-deprived barley plants was assessed. Plants were grown at two levels of N supply, with or without the application of pneumatic pressure to the roots. Applying enough pressure (balancing pressure) to keep xylem sap continuously bleeding from the cut surface of a leaf allowed the plants to remain at full turgor throughout the experiments. Plants from which N was withheld required a greater balancing pressure during both day and night. This difference in balancing pressure was greater at high (2.0 kPa) than low (1.2 kPa) atmospheric vapour pressure deficit (VPD). Pressurizing the roots did not prevent the decline in leaf elongation rate induced by withholding N at either high or low VPD. Thus low shoot water status did not limit leaf growth of N-deprived plants.

Key words: Key words: Barley, evaporative demand, leaf expansion, nitrogen, water status.


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