Molecular Evolution of Rice Blast Resistance Gene bsr-d1

doi:10.1016/j.rsci.2024.08.004

摘要/Abstract

. [J]. Rice Science, 2024, 31(6): 700-711.

Fig. 1. Nucleotide polymorphisms of Bsr-d1 in japonica, indica, and wild rice. A, Composition of 827 rice accessions used for analysis. B, Nucleotide diversity of Bsr-d1 in japonica, indica, and wild rice. N indicates sample size; Nt indicates the number of sites in the analyzed sequence; S indicates the number of polymorphic sites; θ indicates silent nucleotide polymorphism; π indicates nucleotide diversity based on silent sites; Tajima’s D statistic is based on the differences between the number of segregating sites and the average number of nucleotide differences. C, Sliding window of nucleotide diversity (p) of Bsr-d1 in three subgroups. The X-axis represents the nucleotide position along Bsr-d1, and the Y-axis indicates the value of nucleotide diversity per site. The sliding window is 100 bp with a step size of 10 bp. The promoter, 5ʹ UTR (untranslated region), CDS (coding sequence), 3ʹ UTR, and downstream regions are marked on the corresponding region below the sliding windows in their respective areas.

Table 1. Nucleotide polymorphisms of Bsr-d1 in different gene regions.

Group	Component	S	θ	π	Tajima’s D
All	Promoter	63	0.02262	0.01376	0.96874
	5ʹ UTR	3	0.01287	0.00284	0.51108
	CDS	5	0.00437	0.00142	0.04525
	3ʹ UTR	2	0.00547	0.00472	1.02496
	Downstream region	5	0.00679	0.00410	0.85622
Wild rice	Promoter	60	0.02262	0.01387	0.94544
	5ʹ UTR	3	0.01359	0.00572	0.12206
	CDS	5	0.00437	0.00257	0.36591
	3ʹ UTR	1	0.00547	0.00507	0.76849
	Downstream region	5	0.00679	0.00389	0.61085
Indica	Promoter	10	0.01124	0.00624	0.15972
	5ʹ UTR	0	0.00000	0.00000	0.00000
	CDS	1	0.00425	0.00049	0.54851
	3ʹ UTR	0	0.00000	0.00000	0.00000
	Downstream region	0	0.00000	0.00000	0.00000
Japonica	Promoter	12	0.00654	0.00278	0.09672
	5ʹ UTR	0	0.00000	0.00000	0.00000
	CDS	0	0.00000	0.00000	0.00000
	3ʹ UTR	1	0.00353	0.00104	1.04530
	Downstream region	0	0.00000	0.00000	0.00000

Fig. 2. Origin and evolution of Bsr-d1 haplotypes. A, Haplotype network of Bsr-d1. The size of each circle is proportional to the number of samples for a given haplotype. Red boxes represent resistance haplotypes. The highly susceptible rice variety Lijiangxintuanheigu (LTH) is classified under Hap_3, while the highly resistant rice variety Digu is classified under Hap_19. B, Geographic distribution of Oryza nivara belonging to Hap_27. Orange dots represent the geographical distribution of Hap_27. The area enclosed by the blue ellipse highlights the region adjacent to the the Indian Peninsula and the Indochina Peninsula.

Table 2. Nucleotide information of 28 haplotypes of Bsr-d1.

Haplotype	Sequence
Reference	TCAGTTGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_1	TCAGTCGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_2	TCAGTTGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_3	TCAGTCGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCACCTCGGGTGCTCCCGCGCGGA
Hap_4	TCAGTCGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCACGGGGCCAACTCGGGTGCTCCCGCGCGGA
Hap_5	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCACCTCGGGTGCTCCCGCGCGGA
Hap_6	TCAGTCGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_7	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCACCTCGGGTGCTCCCACGCGGA
Hap_8	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCAACTCGGGTGCTCCCGCGCGGA
Hap_9	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGTGCCATGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_10	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGCGCCACGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_11	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_12	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACACTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_13	TAACACGCGTTCGCCCGAGATGCGACCGAGGACCCCCGACACTATGTCTTGGGCCAACCCCGGGTGCTCTCGTACGGC
Hap_14	TAACACGCGTTCGCCCGAGATGCGACCGAGGACCCCCGACACTATGTCTCGGGCCAACCCCGGGTGCTCTCGTACGGC
Hap_15	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTCGGGGCCAACTCGGGTGCTCCCGTACGGC
Hap_16	TAAGACGCTTTGGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_17	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTTGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_18	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTCGGCCCCACCTCGGGTGCTCCCGTACGGC
Hap_19	TAAGACGCGTTCGCTCGGGATGCGATCGAGGACCCCCTACGCTGTGCGTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_20	TAAGACGCGTTCCCCTGAGGTGCGACCGAGGACCCTCGACGCTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_21	TAAGACGCGTTCGCTCGGGATGCGATCGAGGACCCCCTACGCTGTGTGTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_22	TAACACGCGTTCGTCCGGGGTGCGACCGAGGACCCCCGACGCTATGTCTCGGGCCATCCCCGGGTGCTCTCGTACGGC
Hap_23	TAAGACGCGTTCGCTCGGGATGCGATCGGGGACCCCCTACGCTGTGCGTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_24	TAAGACGCGTTCGCTCGGGGTGCGATCGAGGACCCCCTACGCTGTGCGTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_25	TATGACACGCTAGTCTGGGGTGCGACCGAGAACTCCCGACGCCATGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_26	TAAGACGCGTTCGCTTGGGATGCGACCGAGGACCCCCGACGCTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_27	TAAGACGCGTTCGCCCGGGGTGCGATCGAGGACCCCCGACGCTGTGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_28	TCAGTCGCTCTAGCCTGGGACACGACCGAGGACCCTCGGCGCCACGCCACGGGGACAACTCGGGTGCTCCCGCGCGGA

Table 2. Nucleotide information of 28 haplotypes of Bsr-d1.

Haplotype	Sequence
Reference	TCAGTTGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_1	TCAGTCGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_2	TCAGTTGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_3	TCAGTCGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCACCTCGGGTGCTCCCGCGCGGA
Hap_4	TCAGTCGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCACGGGGCCAACTCGGGTGCTCCCGCGCGGA
Hap_5	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCACCTCGGGTGCTCCCGCGCGGA
Hap_6	TCAGTCGAGCTAGCCTGGGGTGCGACCAAGGCTCCCTGGCGCCATGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_7	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCACCTCGGGTGCTCCCACGCGGA
Hap_8	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGCGCCATGCCTCGGGGCCAACTCGGGTGCTCCCGCGCGGA
Hap_9	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGTGCCATGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_10	TCAGTCGAGCTAGCCTGGGATGCGACCAAGGCTCCCTGGCGCCACGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_11	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_12	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACACTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_13	TAACACGCGTTCGCCCGAGATGCGACCGAGGACCCCCGACACTATGTCTTGGGCCAACCCCGGGTGCTCTCGTACGGC
Hap_14	TAACACGCGTTCGCCCGAGATGCGACCGAGGACCCCCGACACTATGTCTCGGGCCAACCCCGGGTGCTCTCGTACGGC
Hap_15	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTCGGGGCCAACTCGGGTGCTCCCGTACGGC
Hap_16	TAAGACGCTTTGGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_17	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTTGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_18	TAAGACGCGTTCGCCTGAGATGCGACCGAGGACCCTCGACGCTATGCCTCGGCCCCACCTCGGGTGCTCCCGTACGGC
Hap_19	TAAGACGCGTTCGCTCGGGATGCGATCGAGGACCCCCTACGCTGTGCGTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_20	TAAGACGCGTTCCCCTGAGGTGCGACCGAGGACCCTCGACGCTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_21	TAAGACGCGTTCGCTCGGGATGCGATCGAGGACCCCCTACGCTGTGTGTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_22	TAACACGCGTTCGTCCGGGGTGCGACCGAGGACCCCCGACGCTATGTCTCGGGCCATCCCCGGGTGCTCTCGTACGGC
Hap_23	TAAGACGCGTTCGCTCGGGATGCGATCGGGGACCCCCTACGCTGTGCGTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_24	TAAGACGCGTTCGCTCGGGGTGCGATCGAGGACCCCCTACGCTGTGCGTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_25	TATGACACGCTAGTCTGGGGTGCGACCGAGAACTCCCGACGCCATGCCACGGGGCCAACTCGGGTGCTCCCACGCGGA
Hap_26	TAAGACGCGTTCGCTTGGGATGCGACCGAGGACCCCCGACGCTATGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_27	TAAGACGCGTTCGCCCGGGGTGCGATCGAGGACCCCCGACGCTGTGCCTCGGGCCCACCTCGGGTGCTCCCGTACGGC
Hap_28	TCAGTCGCTCTAGCCTGGGACACGACCGAGGACCCTCGGCGCCACGCCACGGGGACAACTCGGGTGCTCCCGCGCGGA

Table 3. Nucleotide diversity of Bsr-d1 in Oryza nivara, indica landraces, and indica major inbred cultivars.

Group	N	Nt	S	θ	π	Tajima’s D
Oryza nivara	167	3 102	74	0.01323	0.00896	0.76345
Indica landrace	33	3 102	11	0.00946	0.00543	0.14335
Indica major inbred cultivar	193	3 102	9	0.00621	0.00354	0.08786

Fig. 3. Rice blast resistance analysis of four bsr-d1 resistance haplotypes. A, Nucleotide sequence alignment of four resistance haplotypes. Sites with different nucleotides among the four resistance haplotypes are marked in red font. The reported resistance site (G) is highlighted in yellow. Sites located in the promoter region are shaded in grey.B, Blast resistance of bsr-d1 resistance haplotype plants assessed by spray inoculation. Three-week-old rice plants were spray-inoculated, and photographs were taken at 7 d post-inoculation. Rice variety names are indicated below the photographs, with Lijiangxintuanheigu (LTH) as a susceptible variety control. C, Fungal growth measured as MoPot2 by qRT-PCR in the inoculated leaves, normalized to OsUbq DNA. Lowercase letters above the bars indicate multiple significant differences detected by two-way analysis of variance. Data are Mean ± SD (n = 3). D, qRT-PCR analyses performed on resistant haplotype rice accessions at 48 h post-inoculation with or without (mock) Magnaporthe oryzae. Total RNA was extracted from leaf blades of three-week-old rice plants. Ubiquitin 5 (Ubq5) was used as an internal control. Data are Mean ± SD (n = 3). P-values were determined by Student’s t-test (**, P < 0.002). Detailed information of rice cultivars is given in Table S7.

Fig. 4. Application of bsr-d1 resistance alleles in China. A, Geographic distribution of bsr-d1 resistance and susceptibility alleles among 384 major inbred cultivars in China. The size of each circle is proportional to the number of samples in each province. B, Frequency distribution of bsr-d1 resistance and susceptibility alleles in major inbred cultivars. C, Distribution of bsr-d1 resistance and susceptibility alleles in major inbred cultivars across different years. 21c, 21st century.

Fig. 5. Identification of bsr-d1 resistance alleles by molecular markers. A, Primer set (Bsr-d1-F/R) designed to target the single nucleotide polymorphism (SNP) site distinguishing resistance and susceptibility alleles, with an expected PCR-amplified product of 530 bp. The number shown at the left of each sequence is the rice variety code. The nucleotide polymorphic site of rice cultivars 1-7, tightly associated with rice blast resistance, is guanine (G), highlighted in red font. Varieties 8‒34 with adenine (A) are susceptible varieties. Detailed information of rice varieties is given in Table S8.B, PCR-based validation of the primer set in 34 rice varieties (30 PCR cycles). Rice varieties 1-34 are referenced in Table S8. OsActin1 (LOC_Os03g50885) was used as a control to ensure that the extracted rice genome is of good quality. M, Marker.

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