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null (Ed.)Cell division is often regulated by extracellular signaling networks to ensure correct patterning during development. In Arabidopsis , the SHORT-ROOT (SHR)/SCARECROW (SCR) transcription factor dimer activates CYCLIND6 ; 1 ( CYCD6;1 ) to drive formative divisions during root ground tissue development. Here, we show plasma-membrane-localized BARELY ANY MERISTEM1/2 (BAM1/2) family receptor kinases are required for SHR -dependent formative divisions and CYCD6;1 expression, but not SHR -dependent ground tissue specification. Root-enriched CLE ligands bind the BAM1 extracellular domain and are necessary and sufficient to activate SHR -mediated divisions and CYCD6;1 expression. Correspondingly, BAM-CLE signaling contributes to the restriction of formative divisions to the distal root region. Additionally, genetic analysis reveals that BAM-CLE and SHR converge to regulate additional cell divisions outside of the ground tissues. Our work identifies an extracellular signaling pathway regulating formative root divisions and provides a framework to explore this pathway in patterning and evolution.more » « less
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Smit, Margot ; McGregor, Shauni ; Sun, Heng ; Gough, Catherine ; BĂ„gman, Anne-Maarit ; Soyars, Cara L. ; Kroon, Johan T. M. ; Gaudinier, Allison ; Williams, Clara J. ; Yang, Xiyan ; et al ( , The Plant Cell)
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Liu, Haijie ; Soyars, Cara L. ; Li, Jianhui ; Fei, Qili ; He, Guijuan ; Peterson, Brenda A. ; Meyers, Blake C. ; Nimchuk, Zachary L. ; Wang, Xiaofeng ( , Plant Direct)