The expression of two DEFICIENS-like genes was reduced in the sepaloid tepals of viridiflora tulips

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  • Hirai Masayo
    Graduate School of Agriculture, Hokkaido University Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists
  • Ochiai Toshinori
    NBS division, Nippon Hifuku Co., Ltd.
  • Kanno Akira
    Graduate School of Life Sciences, Tohoku University

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Abstract

According to the modified ABC model, class B genes are expressed in whorl 1 as well as in whorls 2 and 3, therefore the organs of whorls 1 and 2 have the same petaloid structure in many monocots. The viridiflora tulip, a well-known cultivar group, has flowers in which the tepals in whorls 1 and 2 have greenish stripes. This phenotype could be expected as class B mutant by the modified ABC model. In this study, we discovered that tepal phenotypes correlated with that of stamens. We isolated two class A genes (TGSQA and TGSQB) from wild type tulip. Northern hybridization of these two class A genes, and the class B genes (TGDEFA, TGDEFB and TGGLO), showed that the expression of TGDEFA and TGDEFB in the viridiflora tulips were weaker than those in wild type cultivars, whereas the expression patterns of the rest genes were almost identical. From our results, we suggest that reduced expression of the two DEF-like genes, TGDEFA and TGDEFB, is involved in the development of the viridiflora phenotype. This reduced expression could be caused by the amino acid difference.<br>

Journal

  • Breeding Science

    Breeding Science 60 (2), 110-120, 2010

    Japanese Society of Breeding

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