J Integr Plant Biol. ›› 2020, Vol. 62 ›› Issue (8): 1213-1226.DOI: 10.1111/jipb.12900

Special Issue: Non-coding RNA

• Plant-biotic Interactions • Previous Articles     Next Articles

Osa-miR1873 fine-tunes rice immunity against Magnaporthe oryzae and yield traits

Shi-Xin Zhou1,2†, Yong Zhu1,2†, Liang-Fang Wang2, Ya-Ping Zheng2, Jin-Feng Chen2, Ting-Ting Li2, Xue-Mei Yang2, He Wang1,2, Xu-Pu Li2, Xiao-Chun Ma2, Ji-Qun Zhao1,2, Mei Pu1,2, Hui Feng1,2, Yan Li1,2, Jing Fan1,2, Ji-Wei Zhang1,2, Yan-Yan Huang1,2 and Wen-Ming Wang1,2*   

  1. 1State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu 611130, China
    2Rice Research Institute and Key Lab for Major Crop Diseases, Sichuan Agricultural University, Chengdu 611130, China

    These authors contributed equally to this work.
    *Correspondence: Wen-Ming Wang (j316wenmingwang@sicau.edu.cn)
  • Received:2019-09-19 Accepted:2019-12-20 Online:2019-12-21 Published:2020-08-01


MicroRNAs (miRNAs) are known to fine‐tune growth, development, and stress‐induced responses. Osa‐miR1873 is a rice‐specific miRNA targeting LOC_Os05g01790 . Here, we show that Osa‐miR1873 fine‐tunes rice immunity against Magnaporthe oryzae and yield traits via LOC_Os05g01790 . Osa‐miR1873 was significantly upregulated in a susceptible accession but downregulated in a resistance accession at 24 h post‐inoculation (hpi) of M. oryzae . Overexpressing Osa‐miR1873 enhanced susceptibility to M . oryzae and compromised induction of defense responses. In contrast, blocking Osa‐miR1873 through target mimicry compromised susceptibility to M . oryzae and enhanced induction of defense responses. Altered expression of Osa‐miR1873 also resulted in some defects in yield traits, including grain numbers and seed setting rate. Moreover, overexpression of the target gene LOC_Os05g01790 increased rice blast disease resistance but severely penalized growth and yield. Taken together, we demonstrate that Osa‐miR1873 fine‐tunes the rice immunity‐growth trade‐off via LOC_Os05g01790 , and blocking Osa‐miR1873 could improve blast disease resistance without significant yield penalty. Thus, the Osa‐miR1873‐LOC_Os05g01790 regulatory module is valuable in balancing yield traits and blast resistance.

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