Wounding and pathogen infection induce a chloroplast-targeted lipoxygenase in the common bean (Phaseolus vulgaris L.) |
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Authors: | Helena Porta Rosa Elia Figueroa-Balderas Mario Rocha-Sosa |
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Affiliation: | (1) Departmento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001, Cuernavaca, Morelos, C. P. 6100, Mexico |
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Abstract: | Chloroplastic LOXs are implicated in the biosynthesis of oxylipins like jasmonic acid and C6 volatiles among others. In this study, we isolated the cDNA of a novel chloroplast-targeted Phaseolus vulgaris LOX, (PvLOX6). This gene is highly induced after wounding, non-host pathogen infection, and by signaling molecules as H2O2, SA, ethylene and MeJA. The phylogenetic analysis of PvLOX6 showed that it is closely related to chloroplast-targeted LOX from potato (H1) and tomato (TomLOXC); both of them are implicated in the biosynthesis of C6 volatiles. Induction of PvLOX6 mRNA by wounding ethylene and jasmonic acid on the one side, and non-host pathogen, salicylic acid on the other indicates that common bean uses the same LOX to synthesize oxylipins in response to different stresses. PvLOX6 accession number: EF196866. |
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Keywords: | Lipoxygenase Phaseolus Ethylene H2O2 Pathogen Wounding |
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