Comparative Continental Variation in the Rice Blast Fungus Using Sequence Characterized Amplified Region Markers

Soubabère, Olivier; Tharreau, Didier; Dioh, Waly; Lebrun, Marc‐Henri; Nottéghem, Jean-Loup

doi:10.1007/978-94-015-9430-1_25

Cited by 5 publications

(5 citation statements)

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“…Outside of China, India and Thailand, by contrast, fewer (4–17) lineages were detected in Europe (Roumen et al ., ; Piotti et al ., ), Iran (Javan‐Nikkah et al ., ), USA (Levy et al ., ; Xia et al ., , ; Correll et al ., ), Argentina (Consolo et al ., ), Colombia (Levy et al ., ; Zeigler, ), Cuba (Fuentes et al ., ) and West Africa (Takan et al ., ). Besides these local studies, few attempts have been made to describe the population structure of Mo at a more global scale (Soubabère et al ., ). In the most recent one, Tharreau et al .…”

Section: Introductionmentioning

confidence: 97%

“…Outside of China, India and Thailand, by contrast, fewer (4-17) lineages were detected in Europe (Roumen et al, 1997;Piotti et al, 2005), Iran (Javan-Nikkah et al, 2004), USA (Levy et al, 1991;Xia et al, 1993Xia et al, , 2000Correll et al, 2009), Argentina (Consolo et al, 2008), Colombia (Levy et al, 1993;Zeigler, 1998), Cuba (Fuentes et al, 2003) and West Africa (Takan et al, 2012). Besides these local studies, few attempts have been made to describe the population structure of Mo at a more global scale (Soubab ere et al, 2000). In the most recent one, Tharreau et al (2009) analyzed the genetic diversity of a world-wide collection of strains, and depicted a world-wide genetic structure of three clusters, Asian strains being scattered in the three clusters.…”

Section: Introductionmentioning

confidence: 99%

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South‐East Asia is the center of origin, diversity and dispersion of the rice blast fungus, Magnaporthe oryzae

et al. 2013

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Inferring invasion routes and identifying reservoirs of diversity of plant pathogens are essential in proposing new strategies for their control. Magnaporthe oryzae, the fungus responsible for rice blast disease, has invaded all rice growing areas. Virulent genotypes regularly (re)emerge, causing rapid resistance breakdowns. However, the world-wide genetic subdivision of M. oryzae populations on rice and its past history of invasion have never been elucidated.In order to investigate the centers of diversity, origin and migration of M. oryzae on rice, we analyzed the genetic diversity of 55 populations from 15 countries.Three genetic clusters were identified world-wide. Asia was the center of diversity and the origin of most migrations to other continents. In Asia, two centers of diversity were revealed in the Himalayan foothills: South China–Laos–North Thailand, and western Nepal. Sexual reproduction persisted only in the South China–Laos–North Thailand region, which was identified as the putative center of origin of all M. oryzae populations on rice.Our results suggest a scenario of early evolution of M. oryzae on rice that matches the past history of rice domestication. This study confirms that crop domestication may have considerable influence on the pestification process of natural enemies.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

South‐East Asia is the center of origin, diversity and dispersion of the rice blast fungus, Magnaporthe oryzae

et al. 2013

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“…2009) and a loss of its ability to reproduce sexually. Bottlenecks accompanying migrations and/or selective effects owing to differences in fitness between strains of the two mating types (Soubabère et al. 2000; Couch et al.…”

Section: Introductionmentioning

confidence: 99%

Sex at the origin: an Asian population of the rice blast fungus Magnaporthe oryzae reproduces sexually

Saleh

Shen

et al. 2012

Molecular Ecology

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Sexual reproduction may be cryptic or facultative in fungi and therefore difficult to detect. Magnaporthe oryzae, which causes blast, the most damaging fungal disease of rice, is thought to originate from southeast Asia. It reproduces asexually in all rice-growing regions. Sexual reproduction has been suspected in limited areas of southeast Asia, but has never been demonstrated in contemporary populations. We characterized several M. oryzae populations worldwide both biologically and genetically, to identify candidate populations for sexual reproduction. The sexual cycle of M. oryzae requires two strains of opposite mating types, at least one of which is female-fertile, to come into contact. In one Chinese population, the two mating types were found to be present at similar frequencies and almost all strains were female-fertile. Compatible strains from this population completed the sexual cycle in vitro and produced viable progenies. Genotypic richness and linkage disequilibrium data also supported the existence of sexual reproduction in this population. We resampled this population the following year, and the data obtained confirmed the presence of all the biological and genetic characteristics of sexual reproduction. In particular, a considerable genetic reshuffling of alleles was observed between the 2 years. Computer simulations confirmed that the observed genetic characteristics were unlikely to have arisen in the absence of recombination. We therefore concluded that a contemporary population of M. oryzae, pathogenic on rice, reproduces sexually in natura in southeast Asia. Our findings provide evidence for the loss of sexual reproduction by a fungal plant pathogen outside its centre of origin.

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“…The SCARs we developed were successfully used to test random mating hypothesis (D. Tharreau et al ., unpublished data) and to estimate distances between isolates from different geographical origins (Soubabère et al . 2000).…”

Section: Primer Sequences Amplification Conditions Size and Number mentioning

confidence: 99%

Sequence characterized amplified region markers for the rice blast fungus, Magnaporthe grisea

Soubabère

Jorge

Nottéghem

et al. 2001

Molecular Ecology Notes

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Comparative Continental Variation in the Rice Blast Fungus Using Sequence Characterized Amplified Region Markers

Cited by 5 publications

References 8 publications

South‐East Asia is the center of origin, diversity and dispersion of the rice blast fungus, Magnaporthe oryzae

South‐East Asia is the center of origin, diversity and dispersion of the rice blast fungus, Magnaporthe oryzae

Sex at the origin: an Asian population of the rice blast fungus Magnaporthe oryzae reproduces sexually

Sequence characterized amplified region markers for the rice blast fungus, Magnaporthe grisea

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