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Short Communication | Open Access

OsEXOIII-1: A key regulator of Pigm-mediated panicle blast resistance

Yunyu Wua,b,1, Yue Caia,b,c,1, Yuhong Lia,b, Ling Yua, Cunhong Pana,b,c,d, Zichun Chena,b, Jianju Liua,b, Shuhao Zhua, Wei Shia, Hongjuan Jia, Niansheng Huanga, Xiaoxiang Zhanga,b, Peng Gaoa,b, Zhiping Wanga, Ning Xiaoa,c,d( ), Aihong Lia,b,c,d( )
Lixiahe Agricultural Research Institute of Jiangsu Province, Yangzhou 225007, Jiangsu, China
Zhongshan Biological Breeding Laboratory, Nanjing 210014, Jiangsu, China
Key Laboratory of Plant Functional Genomics of the Ministry of Education, Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding, Agriculture College of Yangzhou University, Yangzhou 225009, Jiangsu, China
Collaborative Innovation Center for Modern Crop Production Co-Sponsored by Province and Ministry, Nanjing 211800, Jiangsu, China

1 These authors contributed equally to this work.

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Abstract

Rice blast is one of the most devastating diseases, particularly panicle blast leads to significant yield losses. Utilization of panicle blast resistance genes is one of the effective ways to control this disease. However, genetic resources with panicle blast resistance are rare. The objective of this study was to identify the role of OsEXOIII-1, a previously identified candidate gene, in Pigm-mediated panicle blast resistance in rice. There were two main haplotypes in rice germplasm, with OsEXOIII-1Hap1, the product of the resistant haplotype, binding more strongly to PiBP1 than OsEXOIII-1Hap2. OsEXOIII-1/PiBP1 positively regulates Pigm-mediated panicle blast resistance by regulating expression of PR1 subfamily genes. OsEXOIII could be a target for breeding panicle blast-resistant cultivars.

Keywords

M. oryzaePanicle blast resistanceExonuclease IIIOsEXOIII-1/PiBP1 modulePR1 genes

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The Crop Journal
Volume 14 Issue 2,
April 2026
Pages 673-678
DOI: 10.1016/j.cj.2025.11.007

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Cite this article:
Wu Y, Cai Y, Li Y, et al. OsEXOIII-1: A key regulator of Pigm-mediated panicle blast resistance. The Crop Journal, 2026, 14(2): 673-678. https://doi.org/10.1016/j.cj.2025.11.007

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Received: 07 August 2025
Revised: 19 October 2025
Accepted: 04 November 2025
Published: 07 December 2025
© 2025 Crop Science Society of China and Institute of Crop Science, CAAS.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).