BLOSSOMING AND FRUIT SET PATTERNS IN PHASEOLUS VULGARIS L. AS INFLUENCED BY TEMPERATURE

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Abstract
Plants of Phaseolus vulgaris were grown under controlled conditions at day/night temperatures of 24.0/15.5, 29.5/21.0, and 35.0/26.5 °C for measurement of blossoming and fruit set patterns over a 60-day period of blossoming. Fruit removal at a large green stage was compared with fruit removal at dry maturity and with removal of all blossoms. Removal of fruit at a large green stage resulted in cyclic patterns of blossoming at the two lower temperatures with a greater proportion of blossoms setting fruit in later cycles. When all blossoms were removed, the cyclic pattern was not as pronounced. When fruit were removed at dry maturity only one blossoming cycle occurred and the plants senesced. The numbers of blossoms and fruit were greatest at 29.5/21.0 °C.