J Integr Plant Biol ›› 2015, Vol. 57 ›› Issue (3): 247-255.DOI: 10.1111/jipb.12285

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Organ-specific effects of brassinosteroids on stomatal production coordinate with the action of TOO MANY MOUTHS

Ming Wang1,2†, Kezhen Yang1† and Jie Le1*   

  • 收稿日期:2014-08-05 接受日期:2014-09-17 出版日期:2014-09-18 发布日期:2014-09-18

Organ-specific effects of brassinosteroids on stomatal production coordinate with the action of TOO MANY MOUTHS

Ming Wang1,2†, Kezhen Yang1† and Jie Le1*   

  1. 1Key Laboratory of Plant Molecular Physiology, Institute of Botany, the Chinese Academy of Sciences, Beijing, China
    2University of Chinese Academy of Sciences, Beijing, China
  • Received:2014-08-05 Accepted:2014-09-17 Online:2014-09-18 Published:2014-09-18
  • About author:†These authors contributed equally to this work.
    *Correspondence: E-mail: lejie@ibcas.ac.cn

摘要： Brassinosteroid (BR) has been shown organ-specific effects in control stomatal production. Mutation of TOO MANY MOUTHS (TMM) leads stomatal clusters in cotyledons but no stomata in hypocotyls. Here, Wang et al. found that BR induced stomatal clusters in tmm hypocotyls, indicating a crosstalk between BR- and TMM-mediated signaling pathways.

Abstract:

In Arabidopsis, stomatal development initiates after protodermal cells acquire stomatal lineage cell fate. Stomata or their precursors communicate with their neighbor epidermal cells to ensure the “one cell spacing” rule. The signals from EPF/EPFL peptide ligands received by TOO MANY MOUTHS (TMM) and ERECTA-family receptors are supposed to be transduced by YODA MAPK cascade. A basic helix-loop-helix transcription factor SPEECHLESS (SPCH) is another key regulator of stomatal cell fate determination and asymmetric entry divisions, and SPCH activity is regulated by YODA MAPK cascade. Brassinosteroid (BR) signaling, one of the most well characterized signal transduction pathways in plants, contributes to the control of stomatal production. But opposite organ-specific effects of BR on stomatal production were reported. Here we confirm that stomatal production in hypocotyls is controlled by BR levels. YODA and CYCD4 are not essential for BR stomata-promoting function. Furthermore, we found that BR could confer tmm hypocotyls clustered stomatal phenotype, indicating that the BR organ-specific effects on stomatal production might coordinate with the TMM organ-specific actions.

 

Wang M, Yang K, Le J (2015). Organ‐specific effects of brassinosteroids on stomatal production coordinate with the action of TOO MANY MOUTHS. J Integr Plant Biol 57: 247–255. doi: 10.1111/jipb.12285

Key words: Arabidopsis, Brassinosteroids, development, stomata

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