The homeotic protein AGAMOUS controls microsporogenesis by regulation of SPOROCYTELESS

Toshiro Ito, Frank Wellmer, Hao Yu, Pradeep Das, Natsuko Ito, Márcio Alves-Ferreira, José Luis Riechmann and Elliot M. Meyerowitz ()
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Toshiro Ito: California Institute of Technology
Frank Wellmer: California Institute of Technology
Hao Yu: California Institute of Technology
Pradeep Das: California Institute of Technology
Natsuko Ito: California Institute of Technology
Márcio Alves-Ferreira: California Institute of Technology
José Luis Riechmann: California Institute of Technology
Elliot M. Meyerowitz: California Institute of Technology

Nature, 2004, vol. 430, issue 6997, 356-360

Abstract: Abstract The Arabidopsis homeotic gene AGAMOUS (AG) is necessary for the specification of reproductive organs (stamens and carpels) during the early steps of flower development1,2,3. AG encodes a transcription factor of the MADS-box family that is expressed in stamen and carpel primordia. At later stages of development, AG is expressed in distinct regions of the reproductive organs2,3,4,5. This suggests that AG might function during the maturation of stamens and carpels, as well as in their early development. However, the developmental processes that AG might control during organogenesis and the genes that are regulated by this factor are largely unknown. Here we show that microsporogenesis, the process leading to pollen formation, is induced by AG through activation of the SPOROCYTELESS gene (SPL, also known as NOZZLE,NZZ), a regulator of sporogenesis6,7. Furthermore, we demonstrate that SPL can induce microsporogenesis in the absence of AG function, suggesting that AG controls a specific process during organogenesis by activating another regulator that performs a subset of its functions.

Date: 2004
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DOI: 10.1038/nature02733

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