MAP KINASE PHOSPHATASE1 Controls Cell Fate Transition during Stomatal Development

Plant Physiology
Farzaneh TamnanlooJin Suk Lee

Abstract

Stomata on the plant epidermis control gas and water exchange and are formed by MAPK-dependent processes. Although the contribution of MAP KINASE3 (MPK3) and MPK6 (MPK3/MPK6) to the control of stomatal patterning and differentiation in Arabidopsis (Arabidopsis thaliana) has been examined extensively, how they are inactivated and regulate distinct stages of stomatal development is unknown. Here, we identify a dual-specificity phosphatase, MAP KINASE PHOSPHATASE1 (MKP1), which promotes stomatal cell fate transition by controlling MAPK activation at the early stage of stomatal development. Loss of function of MKP1 creates clusters of small cells that fail to differentiate into stomata, resulting in the formation of patches of pavement cells. We show that MKP1 acts downstream of YODA (a MAPK kinase kinase) but upstream of MPK3/MPK6 in the stomatal signaling pathway and that MKP1 deficiency causes stomatal signal-induced MAPK hyperactivation in vivo. By expressing MKP1 in the three discrete cell types of stomatal lineage, we further identified that MKP1-mediated deactivation of MAPKs in early stomatal precursor cells directs cell fate transition leading to stomatal differentiation. Together, our data reveal the important role of MKP...Continue Reading

Citations

Apr 17, 2019·Cold Spring Harbor Perspectives in Biology·Hitoshi Endo, Keiko U Torii
Apr 16, 2019·Plant Signaling & Behavior·Raman JangraJin Suk Lee
Jan 27, 2021·International Journal of Molecular Sciences·Antonio Sánchez-GuerreroFrancisca Sevilla
Apr 2, 2021·Plant Physiology·Arvid Herrmann, Keiko U Torii
Jul 31, 2021·Development·Raman JangraJin Suk Lee
Jan 19, 2022·EMBO Reports·Tongjun Sun, Yuelin Zhang

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