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The modified ABC model explains the development of the petaloid perianth of Agapanthus praecox ssp. orientalis (Agapanthaceae) flowers

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Abstract

The class B genes, which belong to the MADS-box gene family, play important roles in regulating the development of petals and stamens in flowering plants. To understand the molecular mechanisms of floral development in Agapanthus praecox ssp. orientalis (Agapanthaceae), we isolated and characterized the homologs of the Antirrhinum majus genes GLOBOSA and DEFICIENS in this plant. These were designated as ApGLO and ApDEF, respectively. ApGLO and ApDEF contain open reading frames that encode deduced protein with 210 and 214 amino acid residues, respectively. Phylogenetic analysis indicated that ApGLO and ApDEF belong to the monocot class B gene family. In situ hybridization experiments revealed that hybridization signals of ApGLO and ApDEF were observed in whorl 1 as well as in whorls 2 and 3. Moreover, the flowers of transgenic Arabidopsis plants that ectopically expressed ApGLO formed petal-like organs in whorl 1. These observations indicate that the flower developmental mechanism of Agapanthus follows the modified ABC model.

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Authors and Affiliations

  1. Graduate School of Life Sciences, Tohoku University, Katahira 2-1-1, 980-8577, Aoba-ku Sendai, Japan

    Toru Nakamura, Tatsuya Fukuda, Toshiaki Kameya & Akira Kanno

  2. Faculty of Agriculture, Niigata University, 2-8050 Ikarashi, 950-2181, Niigata, Japan

    Masaru Nakano

  3. National Institute for Basic Biology, Department of Molecular Biomechanics, The Graduate University for Advanced Studies, 38 Nishigonaka, 444-8585, Myodaiji-cho Okazaki, Japan

    Mitsuyasu Hasebe

Authors
  1. Toru Nakamura
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  2. Tatsuya Fukuda
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  3. Masaru Nakano
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  4. Mitsuyasu Hasebe
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  5. Toshiaki Kameya
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  6. Akira Kanno
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Correspondence to Akira Kanno.

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Nakamura, T., Fukuda, T., Nakano, M. et al. The modified ABC model explains the development of the petaloid perianth of Agapanthus praecox ssp. orientalis (Agapanthaceae) flowers. Plant Mol Biol 58, 435–445 (2005). https://doi.org/10.1007/s11103-005-5218-z

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  • DOI: https://doi.org/10.1007/s11103-005-5218-z

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