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PLANT PHYSIOLOGY , Vol 115, Issue 3 1231-1239, Copyright © 1997 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
SO42- Deprivation Has an Early Effect on the Content of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase and Photosynthesis in Young Leaves of Wheat
S. M. Gilbert, D. T. Clarkson, M. Cambridge, H. Lambers and M. J. Hawkesford
IACR Long Ashton Research Station, Department of Agricultural Sciences, University of Bristol, Long Ashton, Bristol BS18 9AF, United Kingdom (S.M.G., D.T.C., M.J.H.)
Wheat (Triticum aestivum cv Chinese Spring) supplied with 0.45 mM SO42- for
14 d with relative growth rates (RGR) of 0.22 to 0.24 d-1 was deprived of S
for 7 to 8 d. There was no significant effect on RGR or leaf development
(leaf 2 length was constant; leaf 3 expanded for 2-4 d; leaf 4 emerged and
elongated throughout the experiment) during the S deprivation. In controls
the net assimilation rate (A) closely reflected leaf ontogeny. S
deprivation affected A in all leaves, particularly leaf 4, in which A
remained at 8 to 10 [mu]mol CO2 m-2 s-1, whereas in controls A rose
steadily to >20 [mu]mol CO2 m-2 s-1. In leaf 2, with a fully assembled
photosynthetic system, A decreased in S-deprived plants relative to
controls only at the end of the experiment. Effects on A were not due to
altered stomatal conductance or leaf internal [CO2] ([C]i); decreases in
the initial slope of A/[C]i curves indicated an effect of S deprivation on
the carboxylase efficiency. Measurement of Rubisco activity and large
subunit protein abundance paralleled effects on A and A/[C]i in S-deprived
leaves. Negative effects on photosynthesis in S-deprived plants are
discussed in relation to mobilization of S reserves, including Rubisco,
emphasizing the need for continuous S supply during vegetative growth.
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