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Abstract. A tomato (Lycopersicon esculentum Mill.) monogenic semidominant mutation, stamenless (sl), which results in homeotic conversions in two adjacent floral whorls, was studied. When grown at standard temperature, flowers of sl/sl plants showed sepaloid petals in the second whorl and strong transformation of stamens to carpels in whorl three. These transformed carpels were fused with each other...