Clade classification of monolignol biosynthesis gene family members reveals target genes to decrease lignin in Lolium...

Area of Science:

• Plant Molecular Biology
• Bioinformatics
• Agricultural Science

Background:

• Lignin content significantly affects monocot cell wall digestibility.
• Understanding paralogue roles in multigene families is crucial for engineering lignin biosynthesis.

Purpose of the Study:

• Genome-wide identification of candidate genes for monolignol biosynthesis in *Lolium perenne*.
• Functional subtyping of phylogenetic clades within key multigene families (4CL, COMT, CAD, CCR).

Main Methods:

• Bioinformatics approach for gene identification.
• Functional subtyping based on essential residues and phylogenetic clades.
• Integration of existing experimental data on gene expression, function, and enzymatic activity.

Main Results:

• Identified prime target paralogues for genetic studies: two 4CL, two COMT, three CCR, and one CAD gene.
• Assigned functions to novel *L. perenne* genes and assessed functional redundancy.
• Proposed criteria for prioritizing paralogues and SNPs for genetic studies.

Conclusions:

• The functional subtyping approach is valuable for studying monolignol biosynthesis genes in other monocots.
• Identified genes and criteria can guide genetic engineering for improved lignin traits in *L. perenne*.
• Findings support future research using expression analysis, reverse genetics, and association mapping.