ERECT LEAF1 suppresses jasmonic acid response in rice by decreasing OsWRKY4 stability

By conducting yeast two-hybrid assay and in vitro ubiquitination experiments, we demonstrate that ERECT LEAF 1 interacts with the OsWRKY4 transcription factor, a positive regulator of defense responses to rice sheath blight

Tomoaki Sakamoto; Hidemi Kitano; Shozo Fujioka


Scholarcy highlights

  • Brassinosteroids are plant-specific steroid hormones; in higher plant, they control growth, development, and responses to various biotic and abiotic stresses including thermotolerance, salt and drought stress tolerance, oxidative stress tolerance, pathogen resistance, as well as herbicide and pesticide tolerance. Recent studies involving genetics, biochemistry, proteomics, and molecular biology have uncovered the brassinosteroid signaling pathways from membrane receptor kinases to transcription factors that regulate the expression of several thousand genes. Brassinosteroid-mediate pathways are closely linked with signaling pathways activated by other phytohormones and environmental signals.3,4,11–13The interaction of brassinosteroid and jasmonic acid is crucial in plant development and in responses to biotic and abiotic stimuli
  • We previously reported that ERECT LEAF 1 acts as a positive regulator of brassinosteroid signaling, and is probably involved in brassinosteroid-mediated suppression of jasmonic acid response in rice
  • We reported that ELF1 is probably involved in the brassinosteroid-mediated suppression of jasmonic acid response in rice, because ELF1 suppresses stress-induced signaling and jasmonic acid signaling is stimulated in elf
  • In wild-type rice, OsWRKY4 expression was up-regulated by jasmonic acid treatment but down-regulated by brassinosteroid treatment
  • Jasmonic acid treatment resulted in the accumulation of the OsWRKY4 protein, presumably because it suppressed ELF1 function
  • Our study supports a hypothesis that brassinosteroid and jasmonic acid cooperate to maintain the balance between growth and defense responses; ELF1 participates in the antagonistic interaction between these two phytohormones by suppressing the jasmonic acid response through a decrease in the OsWRKY4 protein level in rice

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