The evolution of the phenylpropanoid pathway entailed pronounced radiations and divergences of enzyme families

Author:

de Vries SophieORCID,Fürst-Jansen Janine MRORCID,Irisarri IkerORCID,Ashok Amra DhabaliaORCID,Ischebeck TillORCID,Feussner KirstinORCID,Abreu Ilka NORCID,Petersen MaikeORCID,Feussner IvoORCID,de Vries JanORCID

Abstract

ABSTRACTLand plants constantly respond to fluctuations in their environment. Part of their response is the production of a diverse repertoire of specialized metabolites. One of the foremost sources for metabolites relevant to environmental responses is the phenylpropanoid pathway, which was long thought to be a land plant-specific adaptation shaped by selective forces in the terrestrial habitat. Recent data have however revealed that streptophyte algae, the algal relatives of land plants, have candidates for the genetic toolkit for phenylpropanoid biosynthesis and produce phenylpropanoid-derived metabolites. Using phylogenetic and sequence analyses, we here show that the enzyme families that orchestrate pivotal steps in phenylpropanoid biosynthesis have independently undergone pronounced radiations and divergence in multiple lineages of major groups of land plants; sister to many of these radiated gene families are streptophyte algal candidates for these enzymes. These radiations suggest a high evolutionary versatility in the enzyme families involved in the phenylpropanoid-derived metabolism across embryophytes. We suggest that this versatility likely translates into functional divergence and may explain the key to one of the defining traits of embryophytes: a rich specialized metabolism.

Publisher

Cold Spring Harbor Laboratory

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