Temperature control of male sterility in a tomato mutant

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Abstract
The male-sterile stamenless-2 (sl-2/ sl-2) mutant of tomato (Lycopersicon esculentum Mill.) produces abnormal stamens and nonviable pollen at relatively intermediate temperature conditions (23°C day/18°C night). If mutant plants are grown at relatively low temperatures (18°C day/15°C night), most flowers produce normal stamens with viable pollen. In contrast, plants grown at high temperatures (28°C day/23°C night) produce ‘car pel-like’ structures in place of stamens with no evidence of pollen formation. The three temperature regimes have no effect on the pollen viability of wild-type plants. The regulation of male sterility In sl-2/ sl-2 flowers by different temperature conditions corresponds closely with the effects of plant hormones reported earlier19 and emphasizes the potential use of such a system in tomato breeding programs.

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