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Dormancy responses to post-harvest application of growth regulators in Dioscorea species: I. Responses of bulbils, tubers and tuber pieces of three Dioscorea species

Published online by Cambridge University Press:  27 March 2009

Lynda D. Wickham ,
H. C. Passam  and
L. A. Wilson
Lynda D. Wickham
Affiliation:
Department of Crop Science, University of the West Indies, St Augustine, Trinidad
H. C. Passam
Affiliation:
Department of Crop Science, University of the West Indies, St Augustine, Trinidad
L. A. Wilson
Affiliation:
Department of Crop Science, University of the West Indies, St Augustine, Trinidad
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Summary

The effects on dormancy of post-harvest application of growth regulators to bulbils, tubers and tuber pieces of tropical Dioscorea species were examined. Abscisic acid, kinetin, indole acetic acid and 2-chloroethyltrimethylammonium chloride were found to have little or no effect on either shoot or tuber-root production, while ethrel greatly promoted tuber-root production with little or no effect on shoot development. The germination of slices of tubers of D. alata was delayed by maleic hydrazide but there was no effect on intact tubers of D. alata and D. esculenta. Treatment with 2,4-dichlorophenoxyacetic acid caused massive root and callus development along with delay in shoot development, while gibberellic acid occasioned marked extensions in the dormant period.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 102 , Issue 2 , April 1984 , pp. 427 - 432
Copyright
Copyright © Cambridge University Press 1984

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