Journal article

Regulation of tissue-specific expression of SPATULA, a bHLH gene involved in carpel development, seedling germination, and lateral organ growth in Arabidopsis

Michael Groszmann, Yasmin Bylstra, Edwin R Lampugnani, David R Smyth



SPATULA is a bHLH transcription factor that promotes growth of tissues arising from the carpel margins, including the septum and transmitting tract. It is also involved in repressing germination of newly harvested seeds, and in inhibiting cotyledon, leaf, and petal expansion. Using a reporter gene construct, its expression profile was fully defined. Consistent with its known functions, SPT was expressed in developing carpel margin tissues, and in the hypocotyls and cotyledons of germinating seedlings, and in developing leaves and petals. It was also strongly expressed in tissues where no functions have been identified to date, including the dehiscence zone of fruits, developing anthers, embr..

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University of Melbourne Researchers


Awarded by Australian Research Council

Funding Acknowledgements

We thank Marcus Heisler, John Alvarez, and other colleagues for stimulating advice and interest, and John Arvanitakis for technical assistance. Steve Swain kindly provided ind-12 mutant seeds, and John Bowman and Yuval Eshed donated cloning vectors. Sandy Floyd and John Bowman provided access to microscopy facilities and advice in their use. This work was supported in part by the Australian Research Council, grant A19927094.