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The mechanism of resistance loss of the super rice varieties to rice blast

  • Bo Lan
  • Yingqing Q. Yang
  • Qiang Sun
  • Hongfan Chen
  • Yonghui Huang
  • Jian Chen
  • Xiangmin Li
  • Guanghua HuoEmail author
Original Article

Abstract

In order to clarify the mechanism of the resistance loss of super rice varieties to rice blast, we monitored the resistance of 10 super rice varieties to rice blast for four consecutive years under different ecological conditions. The results showed that the disease index of all the tested varieties exhibited an increasing trend, and the resistance level decreased every year. We focused on the analysis of Ganxin 203 and Zhuliangyou 02, which were cultivated for four years, and the number of dominant race and the average virulence frequency of strains from the two varietes increased every year for four consecutive years. We tested the avirulence gene in the strains from the two varieties, the result indicated that the frequency of the avirulent genes gradually decreased in the two varieties for four years. Compared with the results of the resistance gene test of the two varieties, the number of avirulent genes that corresponded to resistance genes of Zhuliangyou 02 was higher than that of Ganxin 203, and these avirulent genes also had higher frequency. It was evident that the main cause of resistance loss of the super rice varieties was the selection of a dominant physiological species of the rice blast, while the occurrence frequency of the avirulent genes that induced the occurrence of resistance with the resistance genes of the rice variety was decreasing every year. The present study is of great scientific significance with regard to the distribution and extension of the life of the super rice varieties.

Keywords

Rice blast Super rice varieties Resistance Loss Mechanism 

Notes

Acknowledgements

This research was supported by the National Natural Science Foundation of China (Grant No.31360425), National Key Research and Development Program of China (Grant No. 2016YFD0200808, 2016YFD0300700, 2017YFD0301604) and Jiangxi Agricultural Research system (Grant No. JXARS-02-04).

Funding

This research was supported by the National Natural Science Foundation of China (Grant No. 31360425, 31460456), National Key Research and Development Program of China (Grant No. 2016YFD0200808, 2016YFD0300700, 2017YFD0301604), Jiangxi Talent Support Program for Distinguished Young Scholars (20171BCB23081), Jiangxi Agricultural Research system (Grant No.JXARS-02-04), the key projects of science and technology in Jiangxi province (20151BBF60067), and the Natural Science Foundation of Jiangxi (Grant No. 20142BAB214021).

Compliance with ethical standards

All analyses were based on previous published studies, thus no ethical approval and patient consent are required.

Conflict of interest

All the authors declare that they has no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent

Informed consent was obtained from all individual participants included in the study.

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Copyright information

© Società Italiana di Patologia Vegetale (S.I.Pa.V.) 2019

Authors and Affiliations

  • Bo Lan
    • 1
    • 2
  • Yingqing Q. Yang
    • 2
  • Qiang Sun
    • 3
  • Hongfan Chen
    • 2
  • Yonghui Huang
    • 4
  • Jian Chen
    • 2
  • Xiangmin Li
    • 2
  • Guanghua Huo
    • 1
    Email author
  1. 1.Jiangxi Key Laborratory for Conservation and Utilization of Fungal ResourcesJiangxi Agricultural UniversityNanchangChina
  2. 2.Institute of Plant ProtectionJiangxi Academy of Agricultural SciencesNanchangChina
  3. 3.Huangdao Customs HouseQingdaoChina
  4. 4.Technology Center of Gongbei CustomsZhuhaiChina

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