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Responses of a Semi-dwarf Wheat to Temperatures Representing a Tropical Dry Season. II. Extreme Temperatures

Published online by Cambridge University Press:  03 October 2008

P. C. Owen
P. C. Owen
Affiliation:
Division of Land Research, CSIRO, Canberra, Australia
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Summary

Under controlled environment conditions a semi-dwarf wheat, Mexico 120, was subjected to temperature regimes representative of the extremes that occur during the dry (winter) season of the Ord River valley in northern Australia. High temperatures (35°C by day: 18°C by night) such as occur at the beginning and end of the dry season were compared with low temperatures (30°C by day: 13°C by night) such as occur in mid-season. Day length was constant at 12 hours. High temperatures from floral initiation onwards adversely affected floret development, and after ear emergence reduced grain filling to nil. Net assimilation rates were reduced by high temperatures. Major effects on yields were caused by high temperatures well before anthesis. The critical temperature after anthesis is apparently between 32° and 35°C.

Type
Research Article
Information
Experimental Agriculture , Volume 7 , Issue 1 , January 1971 , pp. 43 - 47
Copyright
Copyright © Cambridge University Press 1971

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References

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