Flowering, fruiting, and seed maturation of common bean (Phaseolus vulgaris L.) as bases for seed production practices
1991
Lopez, E.L.
Great Northern [GN] 60-183 flowered earlier and had shorter flowering duration than Bush Blue Lake [BBL] 274 in both pot and field-experiments. Both varieties showed distinct peaks of flower production but differed in their flower-pod conversion patterns. The peak of flowering period in GN 60-183 did not coincide with the peak of fruit production. Fruit production peak occurred earlier than peak of flower production. In both varieties, pod set efficiency was higher during the early phase of flowering period than during number of flowers and pods formed per plant in GN 60-183. Among the seed yield components, only the number of pods per plant was significantly affected by spacing treatments. Physiological maturity (PM) of GN 60-183 based on maximum dry weight in both Los Banos and Batac [Philippines] conditions was at 25 DAA while BBL seeds were physiologically mature at 30 DAA. At PM stage, lower leaves of GN 60-183 were turning yellow and pods were yellow green to light yellow while pods of BBL 274 exhibited three distinct colors: yellowish green, greenish yellow and full yellow. After PM stage, the changes noted were pod and seed shrinkage, rapid change in pod color, and rapid loss of pod and seed moisture. BBL 274 seeds derived from early-formed and later-formed flowers reached their PM stage at 30 DAA but maximum germination and vigor did not coincide with the onset of maximum dry weight. Abnormal seeds of BBL 274 had overgrown cotyledons and cracked seed coat. BBL 274 pods of the same chronological age showed uneven rate of color change. Seeds from all color groups did not differ significantly in their dry matter content.
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