![]() Site-specific analyses of positive Darwinian selection revealed relatively high rates of synonymous substitution in the A. moellendorffii, and suggests a supplementary mechanism of nuclear auxin signalling, absent in flowering plants. An N-terminally truncated ARF transcriptional activator is encoded by the genomes of P. moellendorffii and Arabidopsis thaliana genomes suggests that the well-established rapid transcriptional response to auxin of flowering plants, evolved in vascular plants after their divergence from the last common ancestor shared with mosses. To understand the evolution of auxin signalling, we compared the genes encoding two families of crucial transcriptional regulators, AUXIN RESPONSE FACTOR ( ARF) and AUXIN/INDOLE-3-ACETIC ACID ( Aux/IAA), among flowering plants and two non-seed plants, Physcomitrella patens and Selaginella moellendorffii. The plant hormone auxin directs many aspects of plant growth and development.
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