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Mol Biol Evol. 2019 Aug 28. pii: msz202. doi: 10.1093/molbev/msz202. [Epub ahead of print]

Molecular evolution of auxin-mediated root initiation in plants.

Author information

1
National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, 300 Fenglin Road, Shanghai, China.
2
University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, China.
3
College of Life and Environment Sciences, Shanghai Normal University, Shanghai, China.

Abstract

The root originated independently in euphyllophytes (ferns and seed plants) and lycophytes; however, the molecular evolutionary route of root initiation remains elusive. By analyses of the fern Ceratopteris richardii and seed plants, here we show that the molecular pathway involving auxin, intermediate-clade WUSCHEL-RELATED HOMEOBOX (IC-WOX) genes, and WUSCHEL-clade WOX (WC-WOX) genes could be conserved in root initiation. We propose that the "auxin>IC-WOX>WC-WOX" module in root initiation might have arisen in the common ancestor of euphyllophytes during the second origin of roots, and that this module has further developed during the evolution of different root types in ferns and seed plants.

KEYWORDS:

Auxin; Ceratopteris richardii; Root evolution; Root initiation; WOX

PMID:
31504735
DOI:
10.1093/molbev/msz202

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