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Odongo PJ, Onaga G, Ricardo O, Natsuaki KT, Alicai T, Geuten K. Insights Into Natural Genetic Resistance to Rice Yellow Mottle Virus and Implications on Breeding for Durable Resistance. FRONTIERS IN PLANT SCIENCE 2021; 12:671355. [PMID: 34267770 PMCID: PMC8276079 DOI: 10.3389/fpls.2021.671355] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 05/14/2021] [Indexed: 06/13/2023]
Abstract
Rice is the main food crop for people in low- and lower-middle-income countries in Asia and sub-Saharan Africa (SSA). Since 1982, there has been a significant increase in the demand for rice in SSA, and its growing importance is reflected in the national strategic food security plans of several countries in the region. However, several abiotic and biotic factors undermine efforts to meet this demand. Rice yellow mottle virus (RYMV) caused by Solemoviridae is a major biotic factor affecting rice production and continues to be an important pathogen in SSA. To date, six pathogenic strains have been reported. RYMV infects rice plants through wounds and rice feeding vectors. Once inside the plant cells, viral genome-linked protein is required to bind to the rice translation initiation factor [eIF(iso)4G1] for a compatible interaction. The development of resistant cultivars that can interrupt this interaction is the most effective method to manage this disease. Three resistance genes are recognized to limit RYMV virulence in rice, some of which have nonsynonymous single mutations or short deletions in the core domain of eIF(iso)4G1 that impair viral host interaction. However, deployment of these resistance genes using conventional methods has proved slow and tedious. Molecular approaches are expected to be an alternative to facilitate gene introgression and/or pyramiding and rapid deployment of these resistance genes into elite cultivars. In this review, we summarize the knowledge on molecular genetics of RYMV-rice interaction, with emphasis on host plant resistance. In addition, we provide strategies for sustainable utilization of the novel resistant sources. This knowledge is expected to guide breeding programs in the development and deployment of RYMV resistant rice varieties.
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Affiliation(s)
- Patrick J. Odongo
- Molecular Biotechnology of Plants and Micro-Organisms, Institute of Botany and Microbiology, KU Leuven, Leuven, Belgium
- National Crops Resources Research Institute, National Agriculture Research Organization, Kampala, Uganda
| | - Geoffrey Onaga
- National Crops Resources Research Institute, National Agriculture Research Organization, Kampala, Uganda
- M’bé Research Station, Africa Rice Center (AfricaRice), Bouaké, Côte d’Ivoire
| | - Oliver Ricardo
- Breeding Innovations Platform, International Rice Research Institute, Metro Manila, Philippines
| | - Keiko T. Natsuaki
- Graduate School of Agriculture, Tokyo University of Agriculture, Tokyo, Japan
| | - Titus Alicai
- National Crops Resources Research Institute, National Agriculture Research Organization, Kampala, Uganda
| | - Koen Geuten
- Molecular Biotechnology of Plants and Micro-Organisms, Institute of Botany and Microbiology, KU Leuven, Leuven, Belgium
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Tollenaere C, Lacombe S, Wonni I, Barro M, Ndougonna C, Gnacko F, Sérémé D, Jacobs JM, Hebrard E, Cunnac S, Brugidou C. Virus-Bacteria Rice Co-Infection in Africa: Field Estimation, Reciprocal Effects, Molecular Mechanisms, and Evolutionary Implications. FRONTIERS IN PLANT SCIENCE 2017; 8:645. [PMID: 28507553 PMCID: PMC5410622 DOI: 10.3389/fpls.2017.00645] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 04/10/2017] [Indexed: 05/04/2023]
Abstract
Simultaneous infection of a single plant by various pathogen species is increasingly recognized as an important modulator of host resistance and a driver of pathogen evolution. Because plants in agro-ecosystems are the target of a multitude of pathogenic microbes, co-infection could be frequent, and consequently important to consider. This is particularly true for rapidly intensifying crops, such as rice in Africa. This study investigated potential interactions between pathogens causing two of the major rice diseases in Africa: the Rice yellow mottle virus (RYMV) and the bacterium Xanthomonas oryzae pathovar oryzicola (Xoc) in order to: 1/ document virus-bacteria co-infection in rice in the field, 2/ explore experimentally their consequences in terms of symptom development and pathogen multiplication, 3/ test the hypothesis of underlying molecular mechanisms of interactions and 4/ explore potential evolutionary consequences. Field surveys in Burkina Faso revealed that a significant proportion of rice fields were simultaneously affected by the two diseases. Co-infection leads to an increase in bacterial specific symptoms, while a decrease in viral load is observed compared to the mono-infected mock. The lack of effect found when using a bacterial mutant for an effector specifically inducing expression of a small RNA regulatory protein, HEN1, as well as a viral genotype-specific effect, both suggest a role for gene silencing mechanisms mediating the within-plant interaction between RYMV and Xoc. Potential implications for pathogen evolution could not be inferred because genotype-specific effects were found only for pathogens originating from different countries, and consequently not meeting in the agrosystem. We argue that pathogen-pathogen-host interactions certainly deserve more attention, both from a theoretical and applied point of view.
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Affiliation(s)
- Charlotte Tollenaere
- Interactions Plantes-Microorganismes-Environnement, Institut de Recherche pour le Développement (IRD), Cirad, Univ MontpellierMontpellier, France
- Laboratoire Mixte International Patho-Bios, Laboratoire de Bactériologie, Institut de l'Environnement et de Recherches Agricoles (INERA)Bobo-Dioulasso, Burkina Faso
| | - Severine Lacombe
- Interactions Plantes-Microorganismes-Environnement, Institut de Recherche pour le Développement (IRD), Cirad, Univ MontpellierMontpellier, France
- Laboratoire Mixte International Patho-Bios, Laboratoire de Virologie et de Biotechnologies Végétales, Institut de l'Environnement et de Recherches Agricoles (INERA)Kamboinsé, Burkina Faso
| | - Issa Wonni
- Laboratoire Mixte International Patho-Bios, Laboratoire de Bactériologie, Institut de l'Environnement et de Recherches Agricoles (INERA)Bobo-Dioulasso, Burkina Faso
| | - Mariam Barro
- Laboratoire Mixte International Patho-Bios, Laboratoire de Bactériologie, Institut de l'Environnement et de Recherches Agricoles (INERA)Bobo-Dioulasso, Burkina Faso
| | - Cyrielle Ndougonna
- Interactions Plantes-Microorganismes-Environnement, Institut de Recherche pour le Développement (IRD), Cirad, Univ MontpellierMontpellier, France
| | - Fatoumata Gnacko
- Interactions Plantes-Microorganismes-Environnement, Institut de Recherche pour le Développement (IRD), Cirad, Univ MontpellierMontpellier, France
- Laboratoire Mixte International Patho-Bios, Laboratoire de Virologie et de Biotechnologies Végétales, Institut de l'Environnement et de Recherches Agricoles (INERA)Kamboinsé, Burkina Faso
| | - Drissa Sérémé
- Laboratoire Mixte International Patho-Bios, Laboratoire de Virologie et de Biotechnologies Végétales, Institut de l'Environnement et de Recherches Agricoles (INERA)Kamboinsé, Burkina Faso
| | - Jonathan M. Jacobs
- Interactions Plantes-Microorganismes-Environnement, Institut de Recherche pour le Développement (IRD), Cirad, Univ MontpellierMontpellier, France
| | - Eugénie Hebrard
- Interactions Plantes-Microorganismes-Environnement, Institut de Recherche pour le Développement (IRD), Cirad, Univ MontpellierMontpellier, France
| | - Sebastien Cunnac
- Interactions Plantes-Microorganismes-Environnement, Institut de Recherche pour le Développement (IRD), Cirad, Univ MontpellierMontpellier, France
| | - Christophe Brugidou
- Interactions Plantes-Microorganismes-Environnement, Institut de Recherche pour le Développement (IRD), Cirad, Univ MontpellierMontpellier, France
- Laboratoire Mixte International Patho-Bios, Laboratoire de Virologie et de Biotechnologies Végétales, Institut de l'Environnement et de Recherches Agricoles (INERA)Kamboinsé, Burkina Faso
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Sõmera M, Sarmiento C, Truve E. Overview on Sobemoviruses and a Proposal for the Creation of the Family Sobemoviridae. Viruses 2015; 7:3076-115. [PMID: 26083319 PMCID: PMC4488728 DOI: 10.3390/v7062761] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 05/18/2015] [Accepted: 06/02/2015] [Indexed: 12/26/2022] Open
Abstract
The genus Sobemovirus, unassigned to any family, consists of viruses with single-stranded plus-oriented single-component RNA genomes and small icosahedral particles. Currently, 14 species within the genus have been recognized by the International Committee on Taxonomy of Viruses (ICTV) but several new species are to be recognized in the near future. Sobemovirus genomes are compact with a conserved structure of open reading frames and with short untranslated regions. Several sobemoviruses are important pathogens. Moreover, over the last decade sobemoviruses have become important model systems to study plant virus evolution. In the current review we give an overview of the structure and expression of sobemovirus genomes, processing and functions of individual proteins, particle structure, pathology and phylogenesis of sobemoviruses as well as of satellite RNAs present together with these viruses. Based on a phylogenetic analysis we propose that a new family Sobemoviridae should be recognized including the genera Sobemovirus and Polemovirus. Finally, we outline the future perspectives and needs for the research focusing on sobemoviruses.
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Affiliation(s)
- Merike Sõmera
- Department of Gene Technology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia.
| | - Cecilia Sarmiento
- Department of Gene Technology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia.
| | - Erkki Truve
- Department of Gene Technology, Tallinn University of Technology, Akadeemia tee 15, 12618 Tallinn, Estonia.
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Wang B, Jiang L, Zhang Y, Zhang W, Wang Q, Liu S, Liu Y, Cheng X, Zhai H, Wan J. Genetic dissection of the resistance to Rice stripe virus present in the indica rice cultivar 'IR24'. Genome 2011; 54:611-9. [PMID: 21793697 DOI: 10.1139/g11-022] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Rice stripe disease, caused by Rice stripe virus (RSV) and transmitted by the small brown planthopper (Laodelphax striatellus Fallen), is one of the most serious viral diseases of rice in temperate East Asian production regions. Prior quantitative trait loci (QTL) mapping has established that Oryza sativa L. subsp. indica 'IR24' carries positive alleles at the three loci qSTV3, qSTV7, and qSTV11-i. Here, we report an advanced backcross analysis based on three selected chromosome segment substitution lines (CSSLs), each predicted to carry one of these three QTL. Three sets of BC(4)F(2:3) populations were bred from a cross between the critical CSSL and its recurrent parent Oryza sativa L. subsp. japonica 'Asominori'. Both qSTV3 and qSTV11-i were detected in their respective population, but qSTV7 was not. An allelic analysis based on a known carrier of the major RSV resistance gene Stvb-i, which is located on chromosome 11, showed that qSTV11-i was not allelic with Stvb-i. A large mapping population was used to delimit the location of qSTV11-i to a 73.6-kb region. The de novo markers developed for this purpose will be useful as marker-assisted selection tools in efforts to introduce qSTV11-i into breeding programmes aiming to improve the level of RSV resistance.
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Affiliation(s)
- Baoxiang Wang
- State Key Laboratory of Crop Genetics and Germplasm Enhancement, Research Center of Jiangsu Plant Gene Engineering, Nanjing Agricultural University, China
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Boisnard A, Albar L, Thiéméle D, Rondeau M, Ghesquière A. Evaluation of genes from eIF4E and eIF4G multigenic families as potential candidates for partial resistance QTLs to Rice yellow mottle virus in rice. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2007; 116:53-62. [PMID: 17898986 DOI: 10.1007/s00122-007-0646-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2007] [Accepted: 09/09/2007] [Indexed: 05/17/2023]
Abstract
QTLs for partial resistance to Rice yellow mottle virus (RYMV) in rice were mapped in two populations of doubled-haploid lines (DHLs) and recombinant inbred lines (RILs) derived from the same cross but evaluated for different resistance criteria (virus content and symptom severity). An integrative map was used to compare the two genetic maps and a global analysis of both populations was performed. Most of the QTLs previously identified in DHL population were confirmed with increased significance and precision. As many recent studies evidenced the role of eukaryotic translation initiation factors (eIF) of 4E and 4G families in plant susceptibility to RNA viruses, we checked if these genes co-locate with QTLs of resistance to RYMV. Their systematic in silico identification was carried out on the rice genome and their physical locations were compared to QTL positions on the integrative map. In order to confirm or not the co-locations observed, the analysis was completed by evaluation of near-isogenic lines, QTL fine mapping and sequencing of candidate genes. Three members from eIF4G family could be retained as reliable candidates whereas eIF4E genes, commonly found to govern resistances in other plant/virus interactions, were discarded. Together with the recent identification of an eIF(iso)4G as a major resistance gene, data suggests an important role of genes from eIF4G family in rice resistance to RYMV but does not exclude the contribution of factors different from the translation initiation complex.
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Affiliation(s)
- Arnaud Boisnard
- UMR 5096, Laboratoire Génome et Développement des Plantes, IRD/CNRS/Université de Perpignan, BP 64501, 34394, Montpellier Cedex 5, France
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6
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Kouassi NK, Chen L, Siré C, Bangratz-Reyser M, Beachy RN, Fauquet CM, Brugidou C. Expression of rice yellow mottle virus coat protein enhances virus infection in transgenic plants. Arch Virol 2006; 151:2111-22. [PMID: 16773235 DOI: 10.1007/s00705-006-0802-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2005] [Accepted: 05/10/2006] [Indexed: 11/26/2022]
Abstract
The disease caused by rice yellow mottle virus (RYMV) is a major, economically important constraint to rice production in Africa. RYMV is mechanically transmitted by a variety of agents, including insect vectors. The production of resistant rice varieties would be an important advance in the control of the disease and increase rice production in Africa. We produced transgenic plants of the Oryza sativa japonica variety, TP309, to express a RYMV coat protein gene (CP) and mutants of the CP under the control of a ubiquitin promoter. Transgenic plants expressing genes that encode wild-type CP (wt.CP), deleted CP (DeltaNLS.CP), mRNA of the CP, or antisense CP sequences of the CP gene were characterised. Eighty per cent (80%) of independent transgenic lines analysed contained CP gene sequences. Transgenic plants were challenged with RYMV and produced two types of reactions. Most of the plants expressing antisense sequences of the CP and untranslatable CP mRNA exhibited a delay in virus accumulation of up to a week, and the level of virus accumulation was reduced compared with non-transgenic TP309 plants. Transgenic plants expressing RYMV wild-type CP (wt.CP) and deleted CP (DeltaNLS.CP) accumulated the highest levels of virus particles. These results suggest that antisense CP and untranslatable CP mRNA induced moderate resistance, whereas transgenic CP enhanced virus infection.
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Affiliation(s)
- N K Kouassi
- Centre National de Recherche Agronomique (CNRA), Laboratoire Central de Biotechnologies, Abidjan, Côte d'Ivoire
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Wisser RJ, Sun Q, Hulbert SH, Kresovich S, Nelson RJ. Identification and characterization of regions of the rice genome associated with broad-spectrum, quantitative disease resistance. Genetics 2005; 169:2277-93. [PMID: 15716503 PMCID: PMC1449593 DOI: 10.1534/genetics.104.036327] [Citation(s) in RCA: 119] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Much research has been devoted to understanding the biology of plant-pathogen interactions. The extensive genetic analysis of disease resistance in rice, coupled with the sequenced genome and genomic resources, provides the opportunity to seek convergent evidence implicating specific chromosomal segments and genes in the control of resistance. Published data on quantitative and qualitative disease resistance in rice were synthesized to evaluate the distributions of and associations among resistance loci. Quantitative trait loci (QTL) for resistance to multiple diseases and qualitative resistance loci (R genes) were clustered in the rice genome. R genes and their analogs of the nucleotide binding site-leucine-rich repeat class and genes identified on the basis of differential representation in disease-related EST libraries were significantly associated with QTL. Chromosomal segments associated with broad-spectrum quantitative disease resistance (BS-QDR) were identified. These segments contained numerous positional candidate genes identified on the basis of a range of criteria, and groups of genes belonging to two defense-associated biochemical pathways were found to underlie one BS-QDR region. Genetic dissection of disease QTL confidence intervals is needed to reduce the number of positional candidate genes for further functional analysis. This study provides a framework for future investigations of disease resistance in rice and related crop species.
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Affiliation(s)
- Randall J Wisser
- Department of Plant Breeding and Genetics, Institute for Genomic Diversity, Cornell University, Ithaca, New York 14853, USA.
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Kouassi NK, N'Guessan P, Albar L, Fauquet CM, Brugidou C. Distribution and Characterization of Rice yellow mottle virus: A Threat to African Farmers. PLANT DISEASE 2005; 89:124-133. [PMID: 30795214 DOI: 10.1094/pd-89-0124] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Affiliation(s)
- N K Kouassi
- Centre National de Recherche Agronomique (CNRA), Laboratoire Central de Biotechnologies, Côte d'Ivoire
| | - P N'Guessan
- CNRA, Station de Recherche de Man, Côte d'Ivoire
| | - L Albar
- Institut de Recherche pour le Développement (IRD), France
| | - C M Fauquet
- ILTAB, Donald Danforth Plant Science Center, St. Louis, MO, USA
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Calenge F, Faure A, Goerre M, Gebhardt C, Van de Weg WE, Parisi L, Durel CE. Quantitative Trait Loci (QTL) Analysis Reveals Both Broad-Spectrum and Isolate-Specific QTL for Scab Resistance in an Apple Progeny Challenged with Eight Isolates of Venturia inaequalis. PHYTOPATHOLOGY 2004; 94:370-9. [PMID: 18944113 DOI: 10.1094/phyto.2004.94.4.370] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
ABSTRACT The major scab resistance gene Vf, extensively used in apple breeding programs, was recently overcome by the new races 6 and 7 of the fungal pathogen Venturia inaequalis. New, more durable, scab resistance genes are needed in apple breeding programs. F(1) progeny derived from the cross between partially resistant apple cv. Discovery and apple hybrid 'TN10-8' were inoculated in the greenhouse with eight isolates of V. inaequalis, including isolates able to overcome Vf. One major resistance gene, Vg, and seven quantitative trait loci (QTL) were identified for resistance to these isolates. Three QTL on linkage group (LG)12, LG13, and LG15 were clearly isolate-specific. Another QTL on LG5 was detected with two isolates. Three QTL on LG1, LG2, and LG17 were identified with most isolates tested, but not with every isolate. The QTL on LG2 displayed alleles conferring different specificities. This QTL co-localized with the major scab resistance genes Vr and Vh8, whereas the QTL on LG1 colocalized with Vf. These results contribute to a better understanding of the genetic basis of the V. inaequalis-Malus x domestica interaction.
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Kover PX, Caicedo AL. The genetic architecture of disease resistance in plants and the maintenance of recombination by parasites. Mol Ecol 2001; 10:1-16. [PMID: 11251782 DOI: 10.1046/j.1365-294x.2001.01124.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Parasites represent strong selection on host populations because they are ubiquitous and can drastically reduce host fitness. It has been hypothesized that parasite selection could explain the widespread occurrence of recombination because it is a coevolving force that favours new genetic combinations in the host. A review of deterministic models for the maintenance of recombination reveals that for recombination to be favoured, multiple genes that interact with each other must be under selection. To evaluate whether parasite selection can explain the maintenance of recombination, we review 85 studies that investigated the genetic architecture of plant disease resistance and discuss whether they conform to the requirements that emerge from theoretical models. General characteristics of disease resistance in plants and problems in evaluating resistance experimentally are also discussed. We found strong evidence that disease resistance in plants is determined by multiple loci. Furthermore, in most cases where loci were tested for interactions, epistasis between loci that affect resistance was found. However, we found weak support for the idea that specific allelic combinations determine resistance to different host genotypes and there was little data on whether epistasis between resistance genes is negative or positive. Thus, the current data indicate that it is possible that parasite selection can favour recombination, but more studies in natural populations that specifically address the nature of the interactions between resistance genes are necessary. The data summarized here suggest that disease resistance is a complex trait and that environmental effects and fitness trade-offs should be considered in future models of the coevolutionary dynamics of host and parasites.
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Affiliation(s)
- P X Kover
- Department of Biology, Washington University, 1 Brookings Drive, Campus Box 1137, St. Louis, MO, 63130, USA.
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11
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Affiliation(s)
- T Tamm
- Institute of Chemical Physics and Biophysics and Gene Technology Centre, Tallinn Technical University, EE12618 Tallinn, Estonia
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Dioh W, Tharreau D, Notteghem JL, Orbach M, Lebrun MH. Mapping of avirulence genes in the rice blast fungus, Magnaporthe grisea, with RFLP and RAPD markers. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2000; 13:217-227. [PMID: 10659712 DOI: 10.1094/mpmi.2000.13.2.217] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Three genetically independent avirulence genes, AVR1-Irat7, AVRI-MedNoi; and AVR1-Ku86, were identified in a cross involving isolates Guy11 and 2/0/3 of the rice blast fungus, Magnaporthe grisea. Using 76 random progeny, we constructed a partial genetic map with restriction fragment length polymorphism (RFLP) markers revealed by probes such as the repeated sequences MGL/MGR583 and Pot3/MGR586, cosmids from the M. grisea genetic map, and a telomere sequence oligonucleotide. Avirulence genes AVR1-MedNoi and AVR1-Ku86 were closely linked to telomere RFLPs such as marker TelG (6 cM from AVR1-MedNoi) and TelF (4.5 cM from AVR1-Ku86). Avirulence gene AVR1-Irat7 was linked to a cosmid RFLP located on chromosome 1 and mapped at 20 cM from the avirulence gene AVR1-CO39. Using bulked segregant analysis, we identified 11 random amplified polymorphic DNA (RAPD) markers closely linked (0 to 10 cM) to the avirulence genes segregating in this cross. Most of these RAPD markers corresponded to junction fragments between known or new transposons and a single-copy sequence. Such junctions or the whole sequences of single-copy RAPD markers were frequently absent in one parental isolate. Single-copy sequences from RAPD markers tightly linked to avirulence genes will be used for positional cloning.
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Affiliation(s)
- W Dioh
- Génétique Moléculaire des Champignons Phytopathogènes, Institut de Génétique et Microbiologie, CNRS-URA 2255, Université Paris-Sud, Orsay, France
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Ndjiondjop MN, Albar L, Fargette D, Fauquet C, Ghesquière A. The Genetic Basis of High Resistance to Rice Yellow Mottle Virus (RYMV) in Cultivars of Two Cultivated Rice Species. PLANT DISEASE 1999; 83:931-935. [PMID: 30841075 DOI: 10.1094/pdis.1999.83.10.931] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Three cultivars of Oryza sativa (IR64, Azucena, and Gigante) and four cultivars of O. glaberrima (Tog5681, Tog5673, CG14, and SG329) were evaluated for their resistance to two isolates of rice yellow mottle virus (RYMV) by enzyme-linked immunosorbent assay (ELISA) and symptomatology. Cultivars Tog5681 and Gigante were highly resistant, and no symptoms were observed when either virus isolate was inoculated at 10 or 20 days postgermination and assayed by ELISA at 7, 14, 22, 35, 50, or 64 days postinoculation. Azucena showed a partial resistance, whereas the other cultivars were susceptible. Symptom appearance was associated with increase in ELISA absorbance in the systemically infected leaves. The best discrimination among the cultivars occurred when the plants were inoculated at 10 days postgermination. Crosses were made between the highly resistant (Gigante and Tog5681) and the susceptible (IR64) cultivars to determine the genetic basis of resistance to RYMV. Evaluation of F1 hybrids and interspecific progenies, as well as the segregation of resistance in F2 and F3 lines of the IR64 × Gigante cross, provided results consistent with the presence of a single recessive resistance gene common to Tog5681 and Gigante.
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Affiliation(s)
- M N Ndjiondjop
- IRD-GeneTrop, BP 5045, 34032 Montpellier Cedex 1, France
| | - L Albar
- IRD-GeneTrop, BP 5045, 34032 Montpellier Cedex 1, France
| | - D Fargette
- CIRAD/IRD-LPRC, BP 5035, 34032 Montpellier Cedex 1, France
| | - C Fauquet
- ILTAB/IRD-TSRI, BCC 206, 10550 North Torrey Pines Road, La Jolla, CA 92037
| | - A Ghesquière
- IRD-GeneTrop, BP 5045, 34032 Montpellier Cedex 1, France
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