title: Parallels in lignin biosynthesis: A study in Selaginella moellendorffii reveals convergence across 400 million years of evolution.
abstract: A hallmark of vascular plants is the development of a complex water-conducting system, which is physically reinforced by the heterogeneous aromatic polymer lignin. Syringyl lignin, a major building block of lignin, is often thought to be uniquely characteristic of angiosperms; however, it was demonstrated over fifty years ago that that syringyl lignin is found in another group of plants, known as the lycophytes, the ancestors of which diverged from all the other vascular plant lineages 400 million years ago.1 To determine the biochemical basis for this common biosynthetic ability, we isolated and characterized cytochrome P450-dependent monooxygenases (P450s) from the lycophyte Selaginella moellendorffii and compared them to the enzyme that is required for syringyl lignin synthesis in angiosperms. Our results showed that one of these P450s encodes an enzyme that is functionally analogous to but phylogenetically independent from its angiosperm counterpart. Here, we discuss the evolution of lignin biosynthesis in vascular plants and the role of Selaginella moellendorffii in plant comparative biology and genomics.
authors.affiliation: Department of Biochemistry; Purdue University; West Lafayette, Indiana, USA.
authors.forename: Jing-Ke
authors.initials: JK
authors.lastname: Weng
authors.forename: Jo Ann
authors.initials: JA
authors.lastname: Banks
authors.forename: Clint
authors.initials: C
authors.lastname: Chapple
references.citation: Annu Rev Plant Biol. 2003;54:519-46
references.pmid: 14503002
references.citation: Proc Natl Acad Sci U S A. 2008 Jun 3;105(22):7887-92
references.pmid: 18505841
references.citation: Cell. 2007 Apr 20;129(2):229-34
references.pmid: 17448980
references.citation: Philos Trans R Soc Lond B Biol Sci. 2000 Jun 29;355(1398):857-68
references.pmid: 10905614
references.citation: Plant Cell. 1992 Nov;4(11):1413-24
references.pmid: 1477555
references.citation: Plant Cell. 2007 Oct;19(10):3058-79
references.pmid: 17965273
references.citation: Nature. 2005 Mar 24;434(7032):509-14
references.pmid: 15791256
references.citation: J Agric Food Chem. 1998 Feb 16;46(2):547-552
references.pmid: 10554275
references.citation: Nature. 1953 Jul 4;172(4366):25-6
references.pmid: 13072552
references.citation: Science. 2008 Jan 4;319(5859):64-9
references.pmid: 18079367
references.citation: Curr Biol. 2007 Jul 17;17(14):1225-30
references.pmid: 17627823
references.citation: BMC Genomics. 2005 Jun 06;6:85
references.pmid: 15938755
references.citation: New Phytol. 1987 Jan;105(1):157-173
references.pmid: 33874023