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Complexes of MADS-box proteins are sufficient to convert leaves into floral organs

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  • Takashi Honma
  • Koji Goto

    (Research Institute for Biological Sciences)

Abstract

Genetic studies, using floral homeotic mutants, have led to the ABC model of flower development. This model proposes that the combinatorial action of three sets of genes, the A, B and C function genes, specify the four floral organs (sepals, petals, stamens and carpels) in the concentric floral whorls1,2. However, attempts to convert vegetative organs into floral organs by altering the expression of ABC genes have been unsuccessful3,4,5. Here we show that the class B proteins of Arabidopsis, PISTILLATA (PI) and APETALA3 (AP3), interact with APETALA1 (AP1, a class A protein) and SEPALLATA3 (SEP3, previously AGL9), and with AGAMOUS (AG, a class C protein) through SEP3. We also show that vegetative leaves of triply transgenic plants, 35S::PI;35S::AP3;35S::AP1 or 35S::PI;35S::AP3;35S::SEP3, are transformed into petaloid organs and that those of 35S::PI; 35S::AP3;35S::SEP3;35S::AG are transformed into staminoid organs. Our findings indicate that the formation of ternary and quaternary complexes of ABC proteins may be the molecular basis of the ABC model, and that the flower-specific expression of SEP3 restricts the action of the ABC genes to the flower.

Suggested Citation

  • Takashi Honma & Koji Goto, 2001. "Complexes of MADS-box proteins are sufficient to convert leaves into floral organs," Nature, Nature, vol. 409(6819), pages 525-529, January.
    • Handle: RePEc:nat:nature:v:409:y:2001:i:6819:d:10.1038_35054083
    DOI: 10.1038/35054083
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    Cited by:

    1. Zaijun Yang & Zhengsong Peng & Yan Yu & Shuhong Wei, 2010. "Progress of Molecular Floral Development Research in Wheat," Modern Applied Science, Canadian Center of Science and Education, vol. 4(8), pages 1-43, August.

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