Rmg8 and Rmg7, wheat genes for resistance to the wheat blast fungus, recognize the same avirulence gene AVR‐Rmg8

Anh, Vu Lan; Inoue, Yushi; Asuke, Soichiro; Vy, Trinh Thi Phuong; Anh, Nguyễn Tuấn; Wang, Shizhen; Chuma, Izumi; Tosa, Yukio

doi:10.1111/mpp.12609

Cited by 53 publications

(46 citation statements)

References 25 publications

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“…To understand the frequencies of lines with the 2NS translocation, we obtained their frequencies in eight IBWSNs (45)(46)(47)(48)(49)(50)(51)(52) and SAWSNs (30)(31)(32)(33)(34)(35)(36)(37) distributed internationally between 2012 and 2019 and comprising 4143 lines ( Supplementary Table S9). We observed that in the IBWSNs, the percentage of lines with the 2NS translocation had increased 113.8% in seven years, from 44% in 2012 to 94.1% in 2019.…”

Section: Frequencies Of Lines With the 2ns Translocation In The Ibwsnmentioning

confidence: 99%

“…Genetic resistance to wheat blast at the seedling stage follows a gene-for-gene interaction model 32 and five resistance genes namely Rmg2, Rmg3, Rmg7, Rmg8, and RmgGR119 have been identified in wheat against the MoT pathotype [33][34][35][36][37] . However, the genes Rmg 2, Rmg 3 and Rmg 7 do not confer resistance against the recent MoT isolates, and only Rmg8 and RmgGR119 have been reported to be effective against a range of recent MoT isolates and are promising for spike resistance also 4,37 .…”

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confidence: 99%

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Genome-wide association mapping for wheat blast resistance in CIMMYT’s international screening nurseries evaluated in Bolivia and Bangladesh

Juliana

Kabir

et al. 2020

Sci Rep

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Wheat blast caused by the fungus Magnaporthe oryzae pathotype Triticum (MoT) is an emerging threat to wheat production. To identify genomic regions associated with blast resistance against MoT isolates in Bolivia and Bangladesh, we performed a large genome-wide association mapping study using 8607 observations on 1106 lines from the International Maize and Wheat Improvement Centre’s International Bread Wheat Screening Nurseries (IBWSNs) and Semi-Arid Wheat Screening Nurseries (SAWSNs). We identified 36 significant markers on chromosomes 2AS, 3BL, 4AL and 7BL with consistent effects across panels or site-years, including 20 markers that were significant in all the 49 datasets and tagged the 2NS translocation from Aegilops ventricosa. The mean blast index of lines with and without the 2NS translocation was 2.7 ± 4.5 and 53.3 ± 15.9, respectively, that substantiates its strong effect on blast resistance. Furthermore, we fingerprinted a large panel of 4143 lines for the 2NS translocation that provided excellent insights into its frequency over years and indicated its presence in 94.1 and 93.7% of lines in the 2019 IBWSN and SAWSN, respectively. Overall, this study reinforces the effectiveness of the 2NS translocation for blast resistance and emphasizes the urgent need to identify novel non-2NS sources of blast resistance.

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Section: Frequencies Of Lines With the 2ns Translocation In The Ibwsnmentioning

confidence: 99%

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confidence: 99%

Genome-wide association mapping for wheat blast resistance in CIMMYT’s international screening nurseries evaluated in Bolivia and Bangladesh

Juliana

Kabir

et al. 2020

Sci Rep

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“…Fungicide sprays seem unreliable to control head blast after the expression of disease symptoms (McGrath 2001;Fernández-Ortuño et al 2006;Castroagudin et al 2015). The classical breeding for developing resistant wheat is limited by the few effective wheat blast resistant genes identified so far, including 2NS translocation, Rmg8 and RmgGR119, of which the first has been gradually eroded by new MoT virulence groups (Cruz et al 2016b;Anh et al 2015Anh et al , 2018Ceresini et al 2018;Wang et al 2018). In fact, this extreme virulence diversity explains why resistance has not been durable in Brazil.…”

Section: Introductionmentioning

confidence: 99%

Wheat blast: a new threat to food security

et al. 2020

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Wheat blast, caused by the Magnaporthe oryzae Triticum (MoT) lineage (synonym Pyricularia oryzae Triticum lineage), is a destructive disease in South America and Bangladesh. It is primarily a disease of wheat head, which can cause yield loss up to 100% under favorable disease conditions. The head infection results in complete or partial bleaching of the spike above the point of infection with either no grain or shriveled grain with low test weight. Due to low fungicide efficacy against the disease and lack of availability of resistant varieties, an integrated management program should be adopted to control this serious wheat disease. First of all, a convenient and specific diagnostic tool is needed for evaluating seed health and early detection in wheat field to initiate timely mitigation measures and thereby decreasing pathogen initial inoculum and dispersal. Second, we should have a better understanding of the epidemiology of the disease and develop a real-time disease monitoring and surveillance system to alert growers to apply management practices at an optimum time. Third, we need a better understanding of the infection biology of the fungus and its interaction with wheat plants at the tissue and molecular levels helpful for improving disease management. Fourth, breeding for resistance to wheat blast can be accelerated by using resistance genes such as 2NS translocation, Rmg8 and RmgGR119 or advanced genomic technology such as CRISPR-Cas. Fifth, integration of alternative disease management practices, such as biological control using antagonistic microorganisms or derivatives thereof to achieve sustainable approach for the management of wheat blast. Finally, a globally concerted effort is needed using open science and open data sharing approaches to prevent this seed-and airborne plant disease's widespread devastation of wheat crop. This comprehensive review updates our knowledge on wheat blast disease and discusses the approaches for its sustainable management for ensuring food and nutritional security of the ever-increasing global population.

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“…Rmg2 ( Resistance to Magnaporthe grisea 2 ) (chromosome 7A) and Rmg3 (6B), identified in the hexaploid wheat ( Triticum aestivum ) cultivar Thatcher, confer blast resistance at the seedling stage and are temperature sensitive [ 11 ]. The genes Rmg7 (2A) and Rmg8 (2B), from tetraploid ( T. durum ) and hexaploid wheat respectively, recognise the same avirulence gene AVR-Rmg8 and provide resistance at both the seedling and heading stage [ 12 ]. However, of the two R genes only Rmg8 has been determined to be effective at temperatures above 24 °C [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…The genes Rmg7 (2A) and Rmg8 (2B), from tetraploid ( T. durum ) and hexaploid wheat respectively, recognise the same avirulence gene AVR-Rmg8 and provide resistance at both the seedling and heading stage [ 12 ]. However, of the two R genes only Rmg8 has been determined to be effective at temperatures above 24 °C [ 12 ]. The genes Rmg1 (syn.…”

Section: Introductionmentioning

confidence: 99%

Dissecting the genetic basis of wheat blast resistance in the Brazilian wheat cultivar BR 18-Terena

et al. 2020

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Background Wheat blast, caused by Magnaporthe oryzae Triticum (MoT) pathotype, is a global threat to wheat ( Triticum aestivum L.) production. Few blast resistance ( R ) genes have been identified to date, therefore assessing potential sources of resistance in wheat is important. The Brazilian wheat cultivar BR 18-Terena is considered one of the best sources of resistance to blast and has been widely used in Brazilian breeding programmes, however the underlying genetics of this resistance are unknown. Results BR 18-Terena was used as the common parent in the development of two recombinant inbred line (RIL) F 6 populations with the Brazilian cultivars Anahuac 75 and BRS 179. Populations were phenotyped for resistance at the seedling and heading stage using the sequenced MoT isolate BR32, with transgressive segregation being observed. Genetic maps containing 1779 and 1318 markers, were produced for the Anahuac 75 × BR 18-Terena and BR 18-Terena × BRS 179 populations, respectively. Five quantitative trait loci (QTL) associated with seedling resistance, on chromosomes 2B, 4B (2 QTL), 5A and 6A, were identified, as were four QTL associated with heading stage resistance (1A, 2B, 4A and 5A). Seedling and heading stage QTL did not co-locate, despite a significant positive correlation between these traits, indicating that resistance at these developmental stages is likely to be controlled by different genes. BR 18-Terena provided the resistant allele for six QTL, at both developmental stages, with the largest phenotypic effect conferred by a QTL being 24.8% suggesting that BR 18-Terena possesses quantitative resistance. Haplotype analysis of 100 Brazilian wheat cultivars indicates that 11.0% of cultivars already possess a BR 18-Terena-like haplotype for more than one of the identified heading stage QTL. Conclusions This study suggests that BR 18-Terena possesses quantitative resistance to wheat blast, with nine QTL associated with resistance at either the seedling or heading stage being detected. Wheat blast resistance is also largely tissue-specific. Identification of durable quantitative resistances which can be combined with race-specific R gene-mediated resistance is critical to effectively control wheat blast. Collectively, this work facilitates marker-assisted selection to develop new varieties for cultivation in regions at risk from this emerging disease.

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Rmg8 and Rmg7, wheat genes for resistance to the wheat blast fungus, recognize the same avirulence gene AVR‐Rmg8

Cited by 53 publications

References 25 publications

Genome-wide association mapping for wheat blast resistance in CIMMYT’s international screening nurseries evaluated in Bolivia and Bangladesh

Genome-wide association mapping for wheat blast resistance in CIMMYT’s international screening nurseries evaluated in Bolivia and Bangladesh

Wheat blast: a new threat to food security

Dissecting the genetic basis of wheat blast resistance in the Brazilian wheat cultivar BR 18-Terena

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