Evidence for regulation of resistance in Arabidopsis to Egyptian cotton worm by salicylic and jasmonic acid signaling pathways.

Published

Journal Article

Signaling cross-talk between wound- and pathogen-response pathways influences resistance of plants to insects and disease. To elucidate potential interactions between salicylic acid (SA) and jasmonic acid (JA) defense pathways, we exploited the availability of characterized mutants of Arabidopsis thaliana (L.) Heynh. and monitored resistance to Egyptian cotton worm (Spodoptera littoralis Boisd.; Lepidoptera: Noctuidae). This generalist herbivore is sensitive to induced plant defense pathways and is thus a useful model for a mechanistic analysis of insect resistance. As expected, treatment of wild-type Arabidopsis with JA enhanced resistance to Egyptian cotton worm. Conversely, the coil mutant, with a deficiency in the JA response pathway, was more susceptible to Egyptian cotton worm than wild-type Arabidopsis. By contrast, the nprl mutant, with defects in systemic disease resistance, exhibited enhanced resistance to Egyptian cotton worm. Pretreatment with SA significantly reduced this enhanced resistance of nprl plants but had no influence on the resistance of wild-type plants. However, exogenous SA reduced the amount of JA that Egyptian cotton worm induced in both npr1 mutant and wild-type plants. Thus, this generalist herbivore engages two different induced defense pathways that interact to mediate resistance in Arabidopsis.

Full Text

Duke Authors

Cited Authors

  • Stotz, HU; Koch, T; Biedermann, A; Weniger, K; Boland, W; Mitchell-Olds, T

Published Date

  • February 2002

Published In

Volume / Issue

  • 214 / 4

Start / End Page

  • 648 - 652

PubMed ID

  • 11925049

Pubmed Central ID

  • 11925049

Electronic International Standard Serial Number (EISSN)

  • 1432-2048

International Standard Serial Number (ISSN)

  • 0032-0935

Digital Object Identifier (DOI)

  • 10.1007/s004250100656

Language

  • eng