South-East Asia is the center of origin, diversity and dispersion of the rice blast fungus, Magnaporthe oryzae.
Bottom Line: 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.
Affiliation: CIRAD, UMR BGPI, TA A54/K, F 34398, Montpellier, France; INRA, UMR BGPI, TA A54/K, F 34398, Montpellier, France.Show MeSH
Mentions: Each cluster was significantly differentiated from the others: pairwise FST values were always higher than 0.2, the lowest FST being between clusters 1 and 4 (FST = 0.44 between clusters 1 and 2; 0.49 between clusters 1 and 3; 0.27 between clusters 1 and 4; 0.63 between clusters 2 and 3; 0.48 between clusters 2 and 4; and 0.38 between clusters 3 and 4; P-values of Fisher's exact tests as implemented in Genepop v4 were below 10−5 for all pair of clusters, allowing rejection of the hypothesis of no differentiation). The pairwise DA chord distance calculated among the four Asian clusters confirmed that clusters 1 and 4 were more closely related to each other than to clusters 2 and 3 (Fig.4a).
Affiliation: CIRAD, UMR BGPI, TA A54/K, F 34398, Montpellier, France; INRA, UMR BGPI, TA A54/K, F 34398, Montpellier, France.