Abstract
Abstract One type of male sterility in carrots is expressed as the change of anthers to petaloid structures. Different shapes of petaloids were observed. According to the degree of petaloidy, they were filamentous, spoon-shaped, incomplete and complete. In most cases the 5 transformed stamens of a single flower exhibited the same shape, although in others some variability existed. Serial sections of normal and petaloid stamens revealed anticlinal cell division of the epidermal cell layer early in stamen primordia development to be associated with petaloidy. In one of the lots the anthers were not completely transformed and in this case there was an inverse relationship between the degree of petaloidy and anther locule development. In anthers where pollen grains dehisced, some were viable and germinable.
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