Abstract
Rice blast caused by Magnaporthe oryzae poses a major threat to rice production worldwide. Utilization of resistance is the most effective and economic means to control the disease. An elite maintainer line Yixiang1B (Y1B) has been widely exploited in three-line hybrid rice breeding. However, it remains unclear which blast resistance gene or genes contribute to its resistant phenotype. In this work, we found that a novel functional Pid2 allele is critical for the Y1B’s resistance against rice blast pathogen. First, we confirmed that Y1B is resistant to a number of M. oryzae isolates, with a resistance frequency of 65%. Then, we exploited expression-based approach to genotype the cloned rice blast resistance genes. Transcripts from Pid2, Pid3, Pib, Pi36, Pi5 and Pia were readily detected in Y1B upon M. oryzae infection. Sequencing analyses detected many SNPs in these genes, except that Pib had no substitution and Pid2 contained two tandem base-pair mutations at the nucleotide positions 1997 and 1998 leading to the H666R substitution. Knocking-down Pid2_Y1B via RNAi in Y1B resulted in susceptibility. In contrast, over-expression of Pid2_Y1B in a blast-susceptible accession led to enhanced resistance to M. oryzae. Therefore, Pid2_Y1B is the main contributor to the rice blast resistance in Y1B. Taken together, we identified a functional resistance allele of Pid2 that can be utilized as a resource in rice blast resistant breeding programs.
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Acknowledgements
This work was partially supported by National Natural Science Foundation of China (Grant # 31430072 to W. W), grants from the China Agriculture Rice Research System Projects (CARS-075 to D. Z) and Public Relation Project of Rice Breeding in Sichuan Province (2016NYZ0028 to F. H). We thank Jian Wang (Sichuan Academy of Agricultural Sciences) for kindly providing M. oryzae isolates.
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Fig. S1
R gene alleles of amino acid sequence alignment. (a) Amino acid sequence alignment of Pid3. Pid3_Y1B has 10 amino acid substitutions compared with Pid3_Digu (FJ745364.1), and four of them were found in the functional allele Pid3_A4 (FJ745368.1), three were found in LTH. Susceptible allele of Pid3_LTH (FJ745367.1) has a premature stop codon at residue 731. (b) Amino acid sequence alignment of Pi36. Pi36_Y1B has 22 amino acid substitutions compared with Pi36_Kasalath (DQ900896.1). Susceptible allele of Pi36_LTH (GU169402.1) mutated at residue S590 N. Amino acid polymorphism was marked by shaded letters. (GIF 895 kb)
Fig. S2
Vector construction and identified by restriction enzyme digestion. (a) Construction of the binary vectors used for rice transformation. Pid2_Y1B cDNA sequences designed with KpnI inserted into the binary vector pCAMBIA1300 under the control of the CaMV 35S promoter designated as pBWA (V) HS-1Bpid2 (above). Two β-lectin domain of Pid2_Y1B containing small hairpin structure were designed, named as pBWA (V) HU-1Bpid2 (below). (b) Enzyme digestion of pBWA (V) HS-1B pid2 with KpnI, digestion of pBWA (V) HU-1Bpid2 with MfeI and HindIII. (GIF 29 kb)
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Wang, L., Hu, XH., Lin, G. et al. Expression-based genotyping of the rice blast resistance genes in the elite maintainer line Yixiang1B. Eur J Plant Pathol 148, 955–965 (2017). https://doi.org/10.1007/s10658-017-1149-1
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DOI: https://doi.org/10.1007/s10658-017-1149-1