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Journal of Experimental Botany, Vol 50, 1587-1592, Copyright © 1999 by Oxford University Press

ARTICLES

S nutrition affects the pools of S available to developing grains of wheat

M Fitzgerald, T Ugalde and J Anderson
School of Botany, La Trobe University, Bondoora, 3083 Victoria, Australia; Institute of Sustainable Irrigated Agriculture, Agriculture Victoria, Tatura 3616, Victoria, Australia; Present and correspondence address: Yanco Agricultural Institute, NSW Agriculture, PMB, Yanco, 2703, Australia; Fax: +61 2 69 512 719; E-mail: melissa.fitzgerald@agric.nsw.gov.au

Developing grains of rain-fed wheat must obtain S from reserves that the plant accumulated during vegetative growth. The effect of S nutrition on the sources of S that were transported from vegetative tissues during grain development was examined. Wheat was grown in solution culture with 2 mM N and either 200 M S (high-S) or 50 M S (low-S). All nutrients were withdrawn either at booting, ear emergence, anthesis, or 8 d post anthesis. At 13 d post anthesis, high-S plants contained sulphate in roots and leaves, GSH (glutathione) in leaves, and S in leaf proteins. Between harvests, sulphate was lost from roots and GSH was lost from leaves. Sulphate and GSH were not detected in roots or leaves of low-S plants at 13 d post anthesis, and between harvests, S in leaf-proteins decreased During reproductive growth, redistribution of sulphate from roots was likely to be in response to S demand, redistribution of GSH was likely to result from the breakdown of chloroplasts, and in low-S plants, hydrolysis of leaf proteins in response to N demand was the most important source of S for grain development.Keywords: Glutathione, grain sulphur, protein sulphur, sulphate, sulphur nutrition, sulphur sinks, sulphur sources, wheat.
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M.A. Fitzgerald, T.D. Ugalde, and J.W. Anderson
Sulphur nutrition affects delivery and metabolism of S in developing endosperms of wheat
J. Exp. Bot., July 1, 2001; 52(360): 1519 - 1526.
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