Wednesday, 17 November 2004

Induction of glucosinolates by Myzus persicae (green peach aphid) feeding in Arabidopsis

Jae Hak Kim, and Georg Jander, Boyce Thompson Institute, Tower Road, Ithaca, NY

Glucosinolates (GS) and their breakdown products are Crucifer-specific defensive secondary metabolites, which deter many generalist insect herbivores. Feeding by Myzus persicae (green peach aphid, a generalist herbivore) significantly induced GS in aphid-treated leaves of Arabidopsis land races Columbia-0 and Landsberg erecta. However, systemic induction of GS in untreated leaves was not observed. Two GS, 8-methylsulfinyloctyl-GS and 4-methoxyindol-3-ylmethyl-GS were consistently induced two to five days after aphid treatment. Application of salicylic acid (SA), a plant defense signaling molecule, is also known to induce those two GS. However, induction of GS by aphids in SA-deficient mutants was similar to wild type plants, suggesting that SA signaling pathways are not involved in the induction of GS by M. persicae feeding. Other possible pathways for aphid-mediated GS induction are being investigated.

Species 1: Homoptera Aphidinae Myzus Persicae (green peach aphid)
Species 2: Capparales Brassicaceae Arabidopsis thaliana
Keywords: glucosinolate, induction

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