Salicylic acid-, but not cytokinin-induced, resistance to WCIMV is associated with increased expression of SA-dependent resistance genes in Phaseolus vulgaris

Ivan Gális, Jennifer L. Smith, Paula E. Jameson

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Two-week-old Phaseolus vulgaris plants, wick-fed with 1 mmol/L salicylic acid (SA) or 50 nmol/L dihydrozeatin (DHZ), showed partial inhibition of the accumulation of white clover mosaic virus (WCIMV) in infected primary leaves. This inhibition was measured as a decrease in the accumulation of both viral mRNA and viral coat protein, especially at the early stages of infection. Salicylic acid treatment resulted in moderately increased expression of phenylalanine ammonia lyase (PAL), NPR1, PR1 and HSP70 genes that participate in resistance to pathogens in plants. In contrast, DHZ treatments d d not induce significant changes in expression of these genes. The expression of the P. vulgaris alternative oxidase (AOX) gene homolog, an enzyme implicated in plant resistance to viruses, showed low constitutive expression during the first 11 days post-infection and was not affected by either SA or DHZ. It appears that, while SA induced the NPR1-PR1 pathogen defense pathway genes, both SA and DHZ may use a different pathway to induce resistance to WCIMV infection in P. vulgaris plants.

Original languageEnglish
Pages (from-to)459-466
Number of pages8
JournalJournal of Plant Physiology
Volume161
Issue number4
DOIs
Publication statusPublished - Apr 2004
Externally publishedYes

Keywords

  • Cytokinin
  • Dihydrozeatin (DHZ)
  • Phaseolus vulgaris
  • Salicylic acid (SA)
  • Virus resistance
  • White clover mosaic virus (WCIMV)

ASJC Scopus subject areas

  • Physiology
  • Agronomy and Crop Science
  • Plant Science

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