Plants (Jan 2024)

<i>OsJAZ4</i> Fine-Tunes Rice Blast Resistance and Yield Traits

  • Mingfeng Zhang,
  • Xiao Luo,
  • Wei He,
  • Min Zhang,
  • Zhirong Peng,
  • Huafeng Deng,
  • Junjie Xing

DOI
https://doi.org/10.3390/plants13030348
Journal volume & issue
Vol. 13, no. 3
p. 348

Abstract

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JAZ proteins function as transcriptional regulators that form a jasmonic acid–isoleucine (JA-Ile) receptor complex with coronatine insensitive 1 (COI1) and regulate plant growth and development. These proteins also act as key mediators in signal transduction pathways that activate the defense-related genes. Herein, the role of OsJAZ4 in rice blast resistance, a severe disease, was examined. The mutation of OsJAZ4 revealed its significance in Magnaporthe oryzae (M. oryzae) resistance and the seed setting rate in rice. In addition, weaker M. oryzae-induced ROS production and expression of the defense genes OsO4g10010, OsWRKY45, OsNAC4, and OsPR3 was observed in osjaz4 compared to Nipponbare (NPB); also, the jasmonic acid (JA) and gibberellin4 (GA4) content was significantly lower in osjaz4 than in NPB. Moreover, osjaz4 exhibited a phenotype featuring a reduced seed setting rate. These observations highlight the involvement of OsJAZ4 in the regulation of JA and GA4 content, playing a positive role in regulating the rice blast resistance and seed setting rate.

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