Abstract
Summer rape (Brassica napus cvs. Delta and Westar) plants were grown from seed to maturity in controlled environment cabinets set to hot (27:17 °C, light:dark) and cold (22:15 °C) temperatures. Plants were transferred from the cabinet of origin to the opposite cabinet at different phenological stages. Cross pollination between plants in hot and cold cabinets served to isolate the reproductive organ most sensitive to heat stress. Brassica napus was sterile in controlled environment cabinets with maximum temperatures exceeding 27 °C. In flowers grown in the cold cabinet, the gynoecium extended through the ring of anthers at anthesis, while in heat stressed flowers, the gynoecium was always longer than the anthers. Plants were most sensitive to heat stress from late bud development through to early seed formation. Preanthesis hot temperatures reduced pollen fertility and caused a reduction in female fertility. Postanthesis hot temperatures decreased the female fertility. Key words: temperature stress, male and female sterility, Brassica napus.
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