Scientia Agricultura Sinica ›› 2024, Vol. 57 ›› Issue (23): 4619-4631.doi: 10.3864/j.issn.0578-1752.2024.23.004

• SPECIAL FOCUS: MINING AND UTILIZATION OF CROP DISEASE RESISTANCE AND INSECT-RELATED GENES • Previous Articles     Next Articles

Fine Mapping and Analysis of Pyramiding Effects of Rice Brown Planthopper Resistance Genes QBPH1 and QBPH4

XIONG ShangYe1(), ZHANG Xiang1, LIANG BaoHui1, YE YangDong1, LI YuYang1, ZHU Xiao1, ZHU ZhiHong1, GUAN HuaZhong3, ZHANG Shuai1,2(), WU JianGuo1,2(), HU Jie1,2()   

  1. 1 College of Plant Protection, Fujian Agriculture and Forestry University/State Key Laboratory for Ecological Pest Control of Fujian and Taiwan Crops/Vector-Borne Virus Research Center, Fuzhou 350002
    2 School of Future Technology, Fujian Agriculture and Forestry University/Center for Genetic Improvement, Fuzhou 350002
    3 College of Agriculture, Fujian Agriculture and Forestry University/Fujian Key Laboratory of Crop Breeding by Design and Key Laboratory of Genetics, Fuzhou 350002
  • Received:2024-05-10 Accepted:2024-06-17 Online:2024-12-01 Published:2024-12-07

Abstract:

【Objective】 This study aims to discover new quantitative trait loci (QTLs) for resistance to the brown planthopper (BPH) in rice by utilizing a genetic population and to assess the pyramiding effects of these QTLs, thereby providing crucial genetic materials and resources for breeding insect-resistant rice. 【Method】 A recombinant inbred line (RIL) population derived from a cross between susceptible NPB and resistant Jiafuzhan was used, combined with seedling stage resistance evaluation and extreme mixed pool sequencing (BSA-seq) to map BPH resistance QTLs. Further, fine mapping, candidate gene identification, pyramiding effect analysis, and mixed-pool transcriptome sequencing (BSR-seq) were employed to elucidate the physiological and molecular mechanisms mediated by these QTLs. 【Result】 BSA-seq identified two major resistance QTLs on chromosomes 1 (30-32 Mb) and 4 (5-7 Mb), named QBPH1 and QBPH4, respectively. Interval-linked molecular markers confirmed the authenticity of these QTLs. QBPH4 coincides with previously cloned BPH3 and BPH15, while QBPH1 represents a newly discovered QTL. High-density markers and recombinant analysis further narrowed the QBPH1 region to 30.61-30.65 Mb. This analysis identified Os01g53294 and Os01g53330 as reliable candidate genes, which code for a respiratory burst oxidase protein B and an anthocyanin 5,3-O-glucosyltransferase, respectively. In evaluations of seedling resistance, brown planthopper honeydew area and weight, insect weight gain, lethality, and preference, comparisons between QBPH1 and QBPH4 single genes and their polymerized lines revealed no significant enhancement in resistance. Both QBPH1 and QBPH4 mediated antibiosis and antixenosis mechanisms with varying effects. BSR-seq analysis highlighted significant enrichment of differentially expressed genes (DEGs) involved in transcriptional regulation, protein phosphorylation, and redox processes among different QBPH1 alleles. Additionally, genes associated with jasmonic acid (JA) synthesis and signaling pathways were significantly upregulated in resistant materials, confirmed by RT-qPCR experiments. 【Conclusion】 A novel BPH resistance QTL, QBPH1, was successfully identified on chromosome 1 of rice. QBPH1 mediated both antibiosis and avoidance against BPH, though its aggregation effect with another QTL was not significant. QBPH1 may mediate defense mechanisms against BPH through involvement in the JA pathway. Based on this, Os01g53294 and Os01g53330 have been validated as reliable candidate genes for QBPH1.

Key words: rice, brown planthopper resistance, QTL mapping, gene pyramiding, RNA-seq

Table 1

Primer sequences"

引物 primer 正向引物 Forward primer (5′-3′) 反向引物 Reverse primer (5′-3′) 用途 Purpose
C1-30.40 GAGACTAGTGCTTCCTAGTAG CCAGATTTCTTTATAAGAAGCATG 定位 Mapping
C1-30.50 TCGGCCAGCTGATACGGTATCG TTAGAACAAGCCAAAATAGTCGTT
C1-30.61 TGCAACATAGGTGCTTTGCC CCTGCCAGCAGCCTAACTTA
C1-30.65 CCCTACACACATTGGCATGC AGGCTCTTTTGTTCACTTTACACA
RM128 TTCTTGGAAGCGAAGAGTGAGG CCTCCTTGTGCTCAGCCATGC
C1-30.77 AAACCCCTGAAGTGAATCGC CATCGCCGAAGTCGTTCAC
C1-30.86 TGTTAGGGTGGCTGTTGACT GGAACAACCACAGGAACACA
C1-30.90 TCTCGTGGTTTCCAGACGAA ACTGGGATGGTTCAGACCTC
C1-31.00 TTCATTGCGCCTTTCAGTCCCAT GAGTGGACTGTAGAGATCTCCCAC
C1-31.64 ATGCAGCCGGTCTCGTC TCGCCAAGGTGCTCAGCTC
C1-31.72 AGGAGAACTTCAGAGTGGCG CGTCCGCGGTGAAG
C1-31.76 ACCGGGGCCTAACTAGTCTA GCGGAAAAACGGGGAGAAAG
OsPR1a GTCTTCATCACCTGCAACTACTC CATGCATAAACACGTAGCATAGCA RT-qPCR
JIOsPR10 GCAGCGTCAGGCAGTTCAA GAACTCCAGCCTCTCCTTCATG
OsJAZ8 GTCGCCCACCATCAACAGCA CCGTTGGTGTCATCACTCTT
OsNAC10 TCCTTTGATGATGGCAGCAGCA TGCGGTTTCTTGACAACGGCAT
ONAC131 AATATATCCAAACCAAACACTA AGCAGCGGTTTCTTGGCAACAT
OsJAMyb GAAGAGGACTGGGAAGAGCTG GCTATCTTGGACCATCGGTTGC
OsLOX1 GCATCCCCAACAGCACATC AAGATTTGGGAGTGACATATTGG

Fig. 1

Phenotypes of BPH resistance and preliminary mapping of QTLs in RIL population a: Phenotypic map of resistance to brown planthopper at seedling stage of RIL population and parents; b: RIL population resistance score frequency distribution map; c: Mut-map of QTLs for brown planthopper resistance based on allele frequency difference"

Fig. 2

Physical map and fine mapping of QBPH1 a: Physical map of QBPH1; b: The genotype and phenotype of some recombinant plants. White region: The genotype of NPB; Red region: The genotype of JFZ; Yellow region: Recombined segments; 130-156: number of recombinant plants; S: Susceptible; R: Resistant; MR: Moderately resistant. The red frame line indicates the location interval of QBPH1. The same as below"

Fig. 3

Further fine mapping of QBPH1"

Fig. 4

Gene effect of resistance to brown planthopper in QBPH1 and QBPH4 families a: The photos of seedling resistance and honeydew secretion of BPH; b: Resistance score at seedling stage; c: Weight gain of BPH; d: Honeydew area of BPH; e: Honeydew weight of BPH; f: Preference of settled BPH; g: Survival rate of BPH. The different letters indicate that the analysis of variance is significantly different at the 0.05 level. The same as below"

Fig. 5

DEGs analysis by RNA-seq in the resistant and susceptible groups with contrary QBPH1 genotypes before and after infestation a: Wayne diagram; b: GO enrichment analysis of DEGs after comparison between the resistant group (BR) and the susceptible group (BS) after BPH infestation; c: KEGG pathway analysis of DEGs after comparison between BR and BS; d: A heat map of expression of genes related with Jasmonic acid synthesis and signaling pathway. MR, MS represent the resistant group and the susceptible group before infestation, BR and BS represent the resistant group and the susceptible group 48 hours after infestation, respectively. The same as below"

Fig. 6

RT-qPCR detection of expression levels of JA-related genes before and after infestation"

Table 2

Reliable candidate genes in the fine mapping interval of QBPH1"

基因名称 Locus name MR MS BR BS 基因注释 Gene annotation
LOC_Os01g53294 6.58 7.92 3.09 2.08 呼吸爆发氧化酶蛋白B Respiratory burst oxidase protein B
LOC_Os01g53330 1.28 1.32 3.75 1.83 花青素5,3-O-葡萄糖基转移酶Anthocyanidin 5,3-O-glucosyltransferase
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