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Activation of tomato PR and wound-related genes by a mutagenized tomato MAP kinase kinase through divergent pathways

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Abstract

A mitogen-activated protein kinase kinase (MAPKK) gene, tMEK2, was isolated from tomato cv. Bonny Best. By mutagenesis, a permanently active variant, tMEK2 MUT, was created. Both wild-type tMEK2 and mutant tMEK2 MUT were driven by a newly described strong plant constitutive promoter, tCUP, in a tomato protoplast transient gene expression system. Pathogenesis-related genes, PR1b1, PR3 and Twi1, and a wound-inducible gene, ER5, were activated by tMEK2MUT. Specific inhibitors of p38 class MAPK inhibited tMEK2MUT-induced activation of PR3 and ER5 genes but not that of the PR1b1 or Twi1 gene. Arabidopsis dual-specificity protein tyrosine phosphatase1 (DsPTP1) and maize protein phosphatase 1 (PP1) inhibited tMEK2MUT-induced activation of the ER5 gene and the Twi1 gene, respectively, whereas PR1b1 and PR3 were not affected by either AtDsPTP1, or maize PP1, or Arabidopsis protein phosphatase 2A (PP2A). We have demonstrated for the first time that a single MAPKK activates an array of PR and wound-related genes. Our observation indicates that the activation of the genes downstream of tMEK2 occurs through divergent pathways and that tMEK2 may play an important role in the interaction of signal transduction pathways that mediate responses to both biotic (e.g. disease) and abiotic stresses (e.g. wound responsiveness).

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  1. Tim Xing

    Present address: Agriculture and Agri-Food Canada, Cereal Research Centre, Winnipeg, Manitoba, Canada , R3T 2M9

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  1. Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada, Ottawa, Ontario, Canada , K1A 0C6

    Kamal Malik, Teresa Martin & Brian L Miki

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Xing, T., Malik, K., Martin, T. et al. Activation of tomato PR and wound-related genes by a mutagenized tomato MAP kinase kinase through divergent pathways. Plant Mol Biol 46, 109–120 (2001). https://doi.org/10.1023/A:1010633215445

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