title: Cyclic LIPopeptides from Bacillus subtilis ABS-S14 elicit defense-related gene expression in citrus fruit.
abstract: Effects of cyclic lipopeptides (CLPs) obtained from Bacillus subtilis ABS-S14 on eliciting defense-related gene transcription and activity of defense-related enzymes; glucanase (GLU), chitinase (CHI), peroxidase (POX) and lipoxygenase (LOX) in Citrus sinensis cv. Valencia fruit were determined. The maximum level of GLU transcripts induced in fruit treated with fengycin was significantly greatest among treatments at 48 h. Surfactin enhanced the LOX and POX transcripts. In parallel, corresponding enzyme activities were correlated with changes in gene expression observed in fruit inoculated with Penicillium digitatum following treatment with individual CLPs. Synergistic effects of fengycin and iturin A, fengycin and surfactin were shown in gene transcript of GLU and CHI, respectively, and surfactin induced POX and LOX gene expression of citrus flavedo without pathogen infection. These results suggest that fengycin and surfactin act as elicitors of defense-related gene expression in "Valencia" fruit following infection.
authors.affiliation: Department of Biochemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
authors.forename: Waewruedee
authors.initials: W
authors.lastname: Waewthongrak
authors.affiliation: Department of Biochemistry, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
authors.forename: Wichitra
authors.initials: W
authors.lastname: Leelasuphakul
authors.affiliation: United States Department of Agriculture-The Agricultural Research Service, U.S. Horticultural Research Laboratory, Fort Pierce, Florida, United States of America.
authors.forename: Greg
authors.initials: G
authors.lastname: McCollum
mesh_terms: D001412:Bacillus subtilis / Q000737:chemistry; D002688:Chitinases / Q000096:biosynthesis; D002957:Citrus / Q000187:drug effects / Q000201:enzymology*; D005786:Gene Expression Regulation / Q000187:drug effects*; D055666:Lipopeptides / Q000494:pharmacology*; D008084:Lipoxygenase / Q000096:biosynthesis; D009195:Peroxidase / Q000096:biosynthesis; D010935:Plant Diseases / Q000235:genetics / Q000628:therapy*
chemical_list: D055666:Lipopeptides; D009195:Peroxidase; D008084:Lipoxygenase; D002688:Chitinases