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Heat-induced growth retardation and attempts at its prevention in barley and wheat coleoptiles

Published online by Cambridge University Press:  27 March 2009

I. C. Onwueme  and
H. M. Laude
I. C. Onwueme
Affiliation:
University of California, Davis, U.S.A.
H. M. Laude
Affiliation:
University of California, Davis, U.S.A.
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Extract

Intact barley coleoptiles subjected to high temperature stress of 46°C for up to 4 h showed a significant decrease in their growth rate, and in the final length attained by the coleoptiles before exsertion of the true leaves within. These effects of high temperature were progressively more pronounced with increase in duration of stress. Excised wheat coleoptile sections also experienced a similar growth retardation due to heat stress. This heat-induced growth retardation could not be prevented by exogenous applications of 0·5–100 ppm indole-3-acetic acid or 0·5–5 ppm gibberellic acid; nor by dilute aqueous solutions of calcium chloride, cobalt nitrate or zinc sulphate. The agronomic significance of heat-induced coleoptile stunting is briefly discussed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 79 , Issue 2 , October 1972 , pp. 331 - 333
Copyright
Copyright © Cambridge University Press 1972

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