Abscisic acid in a male sterile tomato mutant and its regulation by low temperature
1998
Singh, S. | Sawhney, V.K.
The role of abscisic acid in male sterility in the stamenless-2 (sl-2) mutant of tomato (Lycopersicon esculentum) was investigated. Vegetative and floral parts (except pistil) of sl-2 contain greater amount of abscisic acid (ABA) than the normal wild-type. The maximum difference in ABA content between sl-2 and normal tissues was in stamens, and the increase in ABA level in sl-2 stamens coincided with first signs of abnormalities in the anthers. Low temperatures restore male fertility in sl-2 and there was a concomitant drop in ABA level in sl-2 leaves and stamens. These observations, along with our earlier reports, suggest that male sterility in sl-2 is a manifestation of hormonal imbalance involving high ABA, and that low temperature regulation of male sterility is mediated through reduction in ABA content.
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