Location: Sugarbeet and Potato Research
Title: Wounding induces expression of genes involved in tuber closing layer and wound-periderm development Authors
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: March 30, 2012
Publication Date: February 8, 2013
Citation: Neubauer, J., Lulai, E.C., Thompson, A.L., Suttle, J.C., Bolton, M.D. 2013. Wounding induces expression of genes involved in tuber closing layer and wound-periderm development. American Journal of Potato Research. 90:142. Technical Abstract: Little is known about the coordinate induction of genes that may be involved in important wound-healing events. In this study, wound-healing events were determined together with wound-induced expression profiles of selected cell cycle, cell wall protein, and pectin methyl esterase genes using tubers from two diverse potato genotypes; NDTX4271-5R and Russet Burbank, 2008 and 2009 harvests. By 5 d after wounding, the closing layer and a nascent phellogen had formed. Phellogen cell divisions generated phellem layers until cessation of cell division at 28 d after wounding for both genotypes. Cell cycle genes were induced by 1 d after wounding; these expressions coordinated with related phellogen formation and the induction and cessation of phellem cell formation. Genes encoding structural cell wall proteins, extensins, were dramatically up-regulated by 1 d to 5 d after wounding, suggesting involvement with closing layer and later phellem cell layer formation. Wounding up-regulated pectin methyl esterase genes; StPME expression increased during closing layer and phellem cell formation, whereas maximum expression of StPrePME occurred at 5 d to 14 d after wounding, implicating involvement in later modifications for closing layer and phellem cell wall formation. The coordinate induction and expression profile of StTLRP, a gene encoding a cell wall strengthening “tyrosine-and lysine-rich protein,” suggested a role in the formation of the closing layer followed by phellem cell generation, but then uniquely extending into periderm maturation. The expression profiles of these wound-inducible genes markedly coordinated with wound-healing events, but were more influenced by harvest than genotype.