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A Tea Hydroperoxide Lyase Gene, CsiHPL1, Regulates Tomato Defense Response Against Prodenia Litura (Fabricius) and Alternaria Alternata f. sp Lycopersici by Modulating Green Leaf Volatiles (GLVs) Release and Jasmonic Acid (JA) Gene Expression



A Tea Hydroperoxide Lyase Gene, CsiHPL1, Regulates Tomato Defense Response Against Prodenia Litura (Fabricius) and Alternaria Alternata f. sp Lycopersici by Modulating Green Leaf Volatiles (GLVs) Release and Jasmonic Acid (JA) Gene Expression



Plant Molecular Biology Reporter 32(1): 62-69



Hydroperoxide lyases (HPLs) play important roles in modulating plant defense by regulating the release of green leaf volatiles (GLVs) and the jasmonic acid (JA) pathway. CsiHPL1-a chloroplast-localized tea gene that encodes HPL-was previously cloned and predicted to be a regulator of plant defense responses. CsiHPL1 was expressed constitutively in transgenic tomato (Solanum lycopersicum) plants to define its function in plant defense. CsiHPL1 overexpression caused tomato to release more constitutive and wound-induced GLVs [including (Z)-hexenal and (Z)-3-hexen-1-ol]. CsiHPL1 transgenic lines also exhibited lower levels of resistance to the larva of the tomato-chewing herbivore Prodenia litura (Fabricius) but enhanced resistance to the necrotrophic fungus Alternaria alternata f. sp. lycopersici (AAL). Furthermore, transgenic lines exhibited decreased expression levels of JA-related genes (SlAOS and SlPI-II) induced by P. litura and AAL infection. We thus concluded that constitutive expression of CsiHPL1 can regulate tomato resistance to P. litura and AAL by modulating GLV release and JA gene expression. Application of these results will be helpful in controlling plant defenses against herbivore attack and fungal disease.

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Accession: 066280556

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DOI: 10.1007/s11105-013-0599-7


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