Patterns of pod growth, development, and respiration in the winged bean (Psophocarpus tetragonolobus)
AbstractCharacteristics of developing flowers and fruits of winged bean cultivar 'TPT 2' at various ages after anthesis and various aspects of growth were studied. Pod growth in length, width and fresh weight, and seed growth in length and width showed sigmoid growth patterns with significantly linear periods of rapid growth extending over many days. Seed fresh weight followed a diauxic growth curve. The respiration rates of intact pods varied with pod age at harvest, reflecting the different growth stages. For use as fresh green beans, this cultivar should be harvested between 15 and 20 days after anthesis; after 20 days they are too tough. A 'seed index', proposed for judgement of snap bean maturity, did not give useful results with winged beans.