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Large scale rice germplasm screening for identification of novel brown planthopper resistance sources

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Abstract

Rice (Oryza sativa L.) is a staple food crop globally. Brown planthopper (Nilaparvata lugens Stål, BPH) is the most destructive insect that threatens rice production annually. More than 40 BPH resistance genes have been identified so far, which provide valuable gene resources for marker-assisted breeding against BPH. However, it is still urgent to evaluate rice germplasms and to explore more new wide-spectrum BPH resistance genes to combat newly occurring virulent BPH populations. To this end, 560 germplasm accessions were collected from the International Rice Research Institute (IRRI), and their resistance to current BPH population of China was examined. A total of 105 highly resistant materials were identified. Molecular screening of BPH resistance genes in these rice germplasms was conducted by developing specific functional molecular markers of eight cloned resistance genes. Twenty-three resistant germplasms were found to contain none of the 8 cloned BPH resistance genes. These accessions also exhibited a variety of resistance mechanisms as indicated by an improved insect weight gain (WG) method, suggesting the existence of new resistance genes. One new BPH resistance gene, Bph44(t), was identified in rice accession IRGC 15344 and preliminarily mapped to a 0–2 Mb region on chromosome 4. This study systematically sorted out the corresponding relationships between BPH resistance genes and germplasm resources using a functional molecular marker system. Newly explored resistant germplasms will provide valualble donors for the identification of new resistance genes and BPH resistance breeding programs.

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All data generated or analyzed during this study are included in this published article and its supplementary information files.

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Acknowledgements

We are extremely grateful to the IRRI for providing resistant rice materials.

Funding

This research was supported by Hubei Hongshan Laboratory (2021hszd005) and the Science and Technology Innovation Team of Hubei Province.

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Rongzhi Chen and Guangcun He conceived and supervised the project; Rongzhi Chen and Ke Yang designed the experiments; Ke Yang performed most of the experiments; Hongmei Liu, Weihua Jiang, Yinxia Hu, Zhiyang Zhou, Xin An, Si Miao, Yushi Qin, Bo Du, Lili Zhu, and Guangcun He performed some of the experiments; and Rongzhi Chen and Ke Yang analyzed the data and wrote the manuscript.

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Correspondence to Rongzhi Chen.

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The authors declare no competing interests.

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Yang, K., Liu, H., Jiang, W. et al. Large scale rice germplasm screening for identification of novel brown planthopper resistance sources. Mol Breeding 43, 70 (2023). https://doi.org/10.1007/s11032-023-01416-x

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  • DOI: https://doi.org/10.1007/s11032-023-01416-x

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