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Effects of applied plant growth substances on pod set in broad beans (Vicia faba var. major)

Published online by Cambridge University Press:  27 March 2009

P. D. Rylott  and
M. L. Smith
P. D. Rylott
Affiliation:
Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JG, UK
M. L. Smith
Affiliation:
Edinburgh School of Agriculture, West Mains Road, Edinburgh EH9 3JG, UK
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Summary

The effects on flower drop and pod set of applications of either the auxin 4-choloroindole, the cytokinin 6-benzylaminopurine (BAP) or gibberellic acid (GA3) to every flower, 1 day before or 1 day after tripping, were studied in broad bean plants grown in a glasshouse in 1988. Control plants shed most of their flowers; pods that did set originated primarily from flowers at proximal positions on the raceme. Most pods set on the lower part of the reproductive portion of the control plants. Chloroindole and GA3 application before tripping had no significant effect on pod-set pattern. However, GA3 applied after tripping significantly enhanced pod set at proximal flowers by 21% but inter-raceme pod set was not significantly altered. Chloroindole applied after tripping significantly increased pod set, particularly at proximal flower positions on the raceme; this treatment increased inter-raceme pod set but the increase was significant only for the basal four racemes and racemes 11, 12 and 13. Application of BAP before or after tripping resulted in almost complete pod set on all racemes; but greater flower drop was observed on the uppermost five racemes of plants treated after tripping than on corresponding racemes of plants treated before tripping. The effects of BAP, chloroindole or GA3 treatment were not due to changes in the synchrony of flower opening. An adequate supply of a cytokinin appeared to be necessary at or before pollination to initiate changes in reproductive organs to prepare them to become net attractors of assimilates from other plant parts. Auxin and gibberellin were only effective in promoting fruit set 24 h after tripping. An adequate supply of auxin, and perhaps of gibberellin, in balance with cytokinin appears to be required after pollination to maintain the flow of adequate assimilates to enable further pod development and for maturation to proceed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 114 , Issue 1 , January 1990 , pp. 41 - 47
Copyright
Copyright © Cambridge University Press 1990

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