Different expression profiles of jasmonic acid and salicylic acid inducible genes in the tomato plant against herbivores with various feeding modes
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We compared the expression profiles of jasmonic acid (JA)-inducible genes (Pin2 and LapA1) and salicylic acid (SA)-inducible genes (PRb-1b and GluB) in the tomato (Solanum lycopersicum cv. Micro-Tom) against herbivores using differing feeding modes: the leaf-chewing larvae of the insects Spodoptera litura and S. exigua; the western flower thrips (Frankliniella occidentalis) and the two-spotted spider mite (Tetranychus urticae) as cell-content feeders; and the leaf miner fly (Liriomyza sativae). Feeding by larvae of both S. litura and S. exigua chiefly activated JA-inducible genes, similar to the response to wound stimuli. Feeding by the thrips F. occidentalis also activated JA-inducible genes, as previously reported in Arabidopsis. Feeding by the spider mite T. urticae activated a JA-inducible LapA1 gene but did not activate a JA-inducible Pin2 gene and additionally activated SA-inducible genes, which were accompanied by the accumulation of SA. This may be a strain that represses induction of the JA signaling pathway. One day after oviposition by the leaf miner fly, L. sativae, JA-inducible genes were activated. However, after the L. sativae larvae hatched and began eating within the leaf tissues, JA-inducible gene expression decreased and SA-inducible gene expression increased. Activation of SA-inducible genes (PRb-1b and GluB) by L. sativae larval feeding seems to suppress JA-mediated plant defense but appears to be unrelated to SA accumulation.
KeywordsLepidopteran insect Thrips Spider mite Leaf miner fly Solanum lycopersicum cv. Micro-Tom
We thank Ms. Yoko Gotoh and Ms. Masumi Teruse for their technical assistance and Ms. Kayoko Furukawa and Ms. Chiaki Kimoto for their assistance in insect rearing and plant growing. This study was supported in part by the Program for Promotion of Basic Research Activities for Innovative Biosciences, Bio-oriented Technology Research Advancement Institution.
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