Journal
MOLECULAR BIOLOGY AND EVOLUTION
Volume 37, Issue 5, Pages 1387-1393Publisher
OXFORD UNIV PRESS
DOI: 10.1093/molbev/msz202
Keywords
root evolution; root initiation; WOX; auxin; Ceratopteris richardii
Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB27030103]
- National Natural Science Foundation of China [31630007]
- Key Research Program of CAS [QYZDB-SSWSMC010]
- Youth Innovation Promotion Association CAS [2014241]
- National Key Laboratory of Plant Molecular Genetics
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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.
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