Premature abscission of phaseolus bean pods: The role of plant growth substances
2010
A 2x5 factorial experiment was conducted to study the effect of
concentrations of 6-benzyladenine (BA) applied at five post anthesis
stages on pod development of Phaseolus vulgaris L., especially in
relation to abscission. The terminal raceme of a five-node cultivar (cv
344) was used for the study. There were no significant differences
between treated plants and controls with respect to numbers of flowers
that opened and those that developed into pods. BA not only delayed the
onset of pod abscission but also slowed it down, giving it a protracted
duration. The cytokinin was effective in reducing pod abscission when
application commenced between anthesis and six days after anthesis. BA
affected pod retention on the distal triad of the terminal raceme where
normally all pods drop off. All treated racemes had significantly (P
<0.01) more seeds at the time of harvest than controls, the overall
increase in seed number being due to increased seed number in pods
borne on the medial and distal triads of the raceme. BA increased pod
retention and seed yield without any significantly effect on the number
of pods on other nodes, and dry matter of the stem and leaves. When BA
was applied beginning at the time of anthesis and using the higher
dosage (400 ppm), normally abscising fruits on the distal triad were
retained with full seed development.
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