, Volume 205, Issue 3, pp 903–913 | Cite as

Cloning and functional analyses of pepper CaRKNR involved in Meloidogyne incognita resistance

  • Zhenchuan Mao
  • Pingping Zhu
  • Feng Liu
  • Yonghong Huang
  • Jian Ling
  • Guohua Chen
  • Yuhong Yang
  • Dongxin Feng
  • Bingyan Xie


Root-knot nematodes (Meloidogyne spp.) are destructive pests of crops. Pepper (Capsicum annuum L.) contains genes that control resistance to root-knot nematodes. Using suppression subtractive hybridization and RACE strategies, a nucleotide-binding site and leucine-rich repeat (NBS-LRR) family gene, CaRKNR (FJ231739), was isolated and cloned from the nematode-resistant pepper line HDA149. CaRKNR is a novel NBS-LRR gene with an open reading frame of 3600 bp that is homologous (70.45 % identity) to the gene Mi-1.2. After Meloidogyne incognita inoculation, real-time qPCR showed that the CaRKNR expression level was increased from 0.63 to 2.16 times. Using the virus-induced gene silencing system, the CaRKNR gene’s expression level was reduced significantly than controls, and the average numbers of galls and egg masses in silenced seedlings were 44.39 and 42.01, respectively, while the controls were 0.13. This study revealed that CaRKNR was induced by M. incognita and its expression correlated with pepper resistance against root-knot nematodes.


Capsicum annuum L. Meloidogyne incognita Resistance gene Cloning Function analysis 



APAF-1, R proteins, and CED-4


Basic local alignment search tool


Leucine-rich repeat


Nucleotide binding




Open reading frame


Protein family


Rapid amplification of cDNA end


Root-knot nematode (Meloidogyne spp.)


Reverse transcriptase quantitative polymerase chain reaction


Suppression subtractive hybridization


Virus induced gene silencing



We thank INRA Versailles for providing the pepper HDA149. This work was supported by the National Science Foundation of China (30971905, 31101425), Agro-scientific Research in the Public Interest (201103018) and the China Agriculture Research System (CARS-25).

Supplementary material

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Supplementary material 1 (DOCX 1886 kb)


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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Zhenchuan Mao
    • 1
  • Pingping Zhu
    • 1
  • Feng Liu
    • 1
  • Yonghong Huang
    • 1
  • Jian Ling
    • 1
  • Guohua Chen
    • 1
  • Yuhong Yang
    • 1
  • Dongxin Feng
    • 1
  • Bingyan Xie
    • 1
  1. 1.Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Biology and Genetic Improvement of Horticultural CropsMinistry of AgricultureBeijingChina

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