Patatin-Related Phospholipase <i>AtpPLAIIIα</i> Affects Lignification of Xylem in Arabidopsis and Hybrid Poplars
Jin Hoon Jang | Ok Ran Lee
Lipid acyl hydrolase are a diverse group of enzymes that hydrolyze the ester or amide bonds of fatty acid in plant lipids. Patatin-related phospholipase AIIIs (pPLAIIIs) are one of major lipid acyl hydrolases that are less closely related to potato tuber patatins and are plant-specific. Recently, overexpression of ginseng-derived <i>PgpPLAIIIβ</i> was reported to be involved in the reduced level of lignin content in <i>Arabidopsis</i> and the mature xylem layer of poplar. The presence of lignin-polysaccharides renders cell walls recalcitrant for pulping and biofuel production. The tissue-specific regulation of lignin biosynthesis, without altering all xylem in plants, can be utilized usefully by keeping mechanical strength and resistance to various environmental stimuli. To identify another pPLAIII homolog from <i>Arabidopsis</i>, constitutively overexpressed <i>AtpPLAIIIα</i> was characterized for xylem lignification in two well-studied model plants, <i>Arabidopsis</i> and poplar. The characterization of gene function in annual and perennial plants with respect to lignin biosynthesis revealed the functional redundancy of less lignification via downregulation of lignin biosynthesis-related genes.
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