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Fine mapping and candidate gene screening of the downy mildew resistance gene RPF1 in Spinach

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A SLAF-BSA approach was used to locate the RPF1 locus. The three most likely candidate genes were identified which provide a basic for cloning the resistance gene at the RPF1 locus.

Abstract

Spinach downy mildew is a globally devastating oomycete disease. The use of downy mildew resistance genes constitutes the most effective approach for disease management. Hence, the objective of the present study was to fine map the first-reported resistance locus RPF1. The resistance allele at this resistance locus was effective against races 1–7, 9, 11, 13, and 15 of Peronospora farinosa f. sp. spinaciae (P. effusa). The approach fine mapped RPF1 using specific-locus amplified fragment sequencing (SLAF-Seq) technology combined with bulked segregant analysis. A 1.72 Mb region localized on chromosome 3 was found to contain RPF1 based on association analysis. After screening recombinants with the SLAF markers within the region, the region was narrowed down to 0.89 Mb. Within this region, 14 R genes were identified based on the annotation information. To identify the genes involved in resistance, resequencing of two resistant inbred lines (12S2 and 12S3) and three susceptible inbred lines (12S1, 12S4, and 10S2) was performed. The three most likely candidate genes were identified via amino acid sequence analysis and conserved domain analysis between resistant and susceptible inbred lines. These included Spo12729, encoding a receptor-like protein, and Spo12784 and Spo12903, encoding a nucleotide-binding site and leucine-rich repeat domains. Additionally, based on the sequence variation in the three genes between the resistant and susceptible lines, molecular markers were developed for marker-assisted selection. The results could be valuable in cloning the RPF1 alleles and improving our understanding of the interaction between the host and pathogen.

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Acknowledgements

This work was performed at the Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, Beijing, China, and was supported by National Natural Science Foundation of China (31401872), the National Science and Technology Pillar Program during the Twelfth Five-Year Plan Period of China (2014BAD01B08), Beijing Scientific Program of Municipal Commission of Science and Technology (Z171100001517014), the Chinese Academy of Agricultural Sciences Innovation Project (CAAS-ASTIP-IVFCAAS), and Fundamental Research Funds for Central Non-profit Scientific Institution (1610102018004).

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Correspondence to James C. Correll or Zhaosheng Xu.

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We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.

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The authors declare that this study complies with the current laws of the countries in which the experiments were performed.

Additional information

Communicated by Richard G.F. Visser.

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Fig. S6

Inoculation test. (a) Inoculation a seedling of the F2 population with Pfs9 using a sprayer. (b) Sporulation Pfs9 on a true leaf of an inoculated spinach seedling, representing a susceptible reaction to the Pfs9 (TIFF 20158 kb)

Fig. S7

Comparison of the amino acid sequences of the Spo12784 resistant and susceptible lines. Spo12784_R and Spo12784_S indicate the amino acid sequences of Spo12784 in the resistant and susceptible lines, respectively. The red arrow indicates that an amino acid mutation at the position results in a change of the conserved domain (TIFF 6252 kb)

Fig. S8

Comparison of the amino acid sequences of the Spo12903 resistant and susceptible lines. Spo12903_R and Spo12903_S indicate the amino acid sequences of Spo12903 in the resistant and susceptible lines, respectively. The red arrow indicates that an amino acid mutation at the position results in a change of the conserved domain (TIFF 7004 kb)

Fig. S9

Comparison of the amino acid sequences of the Spo12729 resistant and susceptible lines. Spo12729_R and Spo12729_S indicate the amino acid sequences of Spo12729 in the resistant and susceptible lines, respectively. The red arrow indicates that an amino acid mutation at the position results in change of conserved domain (TIFF 7105 kb)

Fig. S10

Comparison of the amino acid sequences of the Spo12762 resistant and susceptible lines. Spo12762_R and Spo12762_S indicate the amino acid sequences of Spo12762 in the resistant and susceptible lines, respectively (TIFF 5892 kb)

Fig. S11

Comparison of the amino acid sequences of the Spo12719 resistant and susceptible lines. Spo12719_R and Spo12719_S indicate the amino acid sequences of Spo12719 in resistant and susceptible lines, respectively (TIFF 3801 kb)

Fig. S12

Comparison of the amino acid sequences of the Spo12765 resistant and susceptible lines. Spo12765_R and Spo12765_S indicate the amino acid sequences of Spo12765 in resistant and susceptible lines, respectively (TIFF 7992 kb)

Fig. S13

Comparison of the conserved domain of seven genes (Spo12916, Spo12773, Spo12736, Spo12793, Spo12905, Spo12908, and Spo12730) in the resistant and susceptible lines (TIFF 1727 kb)

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She, H., Qian, W., Zhang, H. et al. Fine mapping and candidate gene screening of the downy mildew resistance gene RPF1 in Spinach. Theor Appl Genet 131, 2529–2541 (2018). https://doi.org/10.1007/s00122-018-3169-4

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