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. 1999 Feb;11(2):289–298. doi: 10.1105/tpc.11.2.289

Jasmonate-based wound signal transduction requires activation of WIPK, a tobacco mitogen-activated protein kinase.

S Seo 1, H Sano 1, Y Ohashi 1
PMCID: PMC144162  PMID: 9927645

Abstract

A gene encoding a tobacco mitogen-activated protein kinase (WIPK) is transcriptionally activated in response to wounding. Transgenic tobacco plants, in which expression of endogenous wipk was suppressed, did not accumulate jasmonic acid or its methyl ester when wounded, suggesting that WIPK is involved in jasmonate-mediated wound signal transduction. Here, we demonstrate that activation of WIPK is required for triggering the jasmonate-mediated signal transduction cascade that occurs when wild-type tobacco plants are wounded. We also show that when plants are wounded, WIPK is rapidly and transiently activated, whereas the quantity of WIPK protein is maintained at a constant level. A transgenic tobacco plant in which the wipk gene was constitutively expressed at a high level showed constitutive enzymatic activation of WIPK and exhibited three- to fourfold higher levels of jasmonate than did its wild-type counterpart. This plant also showed constitutive accumulation of jasmonate-inducible proteinase inhibitor II transcripts. These results show that WIPK is activated in response to wounding, which subsequently causes an increase in jasmonate synthesis.

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Selected References

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