Hormonal orchestration of root apical meristem formation and maintenance in Arabidopsis

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Authors

YAMOUNE Amel CUYACOT Abigail Rubiato ŽĎÁRSKÁ Markéta HEJÁTKO Jan

Year of publication 2021
Type Article in Periodical
Magazine / Source Journal of Experimental Botany
MU Faculty or unit

Central European Institute of Technology

Citation
Web https://academic.oup.com/jxb/article/72/19/6768/6338171
Doi http://dx.doi.org/10.1093/jxb/erab360
Keywords Cell division and differentiation; hormonal crosstalk; hormonal regulation; quiescent centre; root apical meristem; root zonation; stem cell niche
Description Plant hormones are key regulators of a number of developmental and adaptive responses in plants, integrating the control of intrinsic developmental regulatory circuits with environmental inputs. Here we provide an overview of the molecular mechanisms underlying hormonal regulation of root development. We focus on key events during both embryonic and post-embryonic development, including specification of the hypophysis as a future organizer of the root apical meristem (RAM), hypophysis asymmetric division, specification of the quiescent centre (QC) and the stem cell niche (SCN), RAM maturation and maintenance of QC/SCN activity, and RAM size. We address both well-established and newly proposed concepts, highlight potential ambiguities in recent terminology and classification criteria of longitudinal root zonation, and point to contrasting results and alternative scenarios for recent models. In the concluding remarks, we summarize the common principles of hormonal control during root development and the mechanisms potentially explaining often antagonistic outputs of hormone action, and propose possible future research directions on hormones in the root.
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