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Control of Grain Yield by Sink Capacity and Assimilate Supply in Various Rice (Oryza sativa) cultivars

Published online by Cambridge University Press:  03 October 2008

S. Fukai ,
L. Li ,
P. T. Vizmonte  and
K. S. Fischer
S. Fukai
Affiliation:
Department of Agriculture, University of Queensland, Queensland, Australia
L. Li
Affiliation:
Department of Agriculture, University of Queensland, Queensland, Australia
P. T. Vizmonte
Affiliation:
Department of Agriculture, University of Queensland, Queensland, Australia
K. S. Fischer
Affiliation:
Department of Agriculture, University of Queensland, Queensland, Australia
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Summary

The objective of this study was to identify whether grain yield in four contrasting rice cultivars is limited by supply of assimilate to fill the grains or by sink capacity to accept the assimilate. Grain yield was limited mostly by sink capacity, with little variation in single grain weight among cultivars, but an old cultivar showed some ability to adjust single grain weight. Sink capacity was very sensitive to variation in assimilate supply immediately after anthesis. Reduction in assimilate supply in the anthesis to early grain filling period reduced filled grain percentage and grain yield, particularly in high yielding cultivars with a large number of grains per panicle.

Type
Research Article
Information
Experimental Agriculture , Volume 27 , Issue 2 , April 1991 , pp. 127 - 135
Copyright
Copyright © Cambridge University Press 1991

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References

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