Changes in Regulation of a Transcription Factor Lead to Autogamy in Cultivated Tomatoes

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Science  26 Oct 2007:
Vol. 318, Issue 5850, pp. 643-645
DOI: 10.1126/science.1148428

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We report the cloning of Style2.1, the major quantitative trait locus responsible for a key floral attribute (style length) associated with the evolution of self-pollination in cultivated tomatoes. The gene encodes a putative transcription factor that regulates cell elongation in developing styles. The transition from cross-pollination to self-pollination was accompanied, not by a change in the STYLE2.1 protein, but rather by a mutation in the Style2.1 promoter that results in a down-regulation of Style2.1 expression during flower development.

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