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A Morphological Study of the Development of Reproductive Structures of Phaseolus vulgaris L.1


The high degree of self-pollination in Phaseolus vulgaris cv. Light Red Kidney is attributed to the fact that flowers are autogamous and to the following characteristics: proximity of anthers and stigma at time of maturity; simultaneous maturation of pollen and receptivity of the stigamtic surface; and, possibly, to the position and orientation of stylar hairs. A morphologically variant pistil, in which the stigma is receptive when the flower is fully open, develops in a few flowers. Such flowers may be cross-pollinated by bees or other insects. The sugary secretion of stigmatic epidermal cells appears to enhance pollen retention and may provide an environment conducive to pollen germination.