South-East Asia is the center of origin, diversity and dispersion of the rice blast fungus, Magnaporthe oryzae
Article first published online: 10 DEC 2013
© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Volume 201, Issue 4, pages 1440–1456, March 2014
How to Cite
Saleh, D., Milazzo, J., Adreit, H., Fournier, E. and Tharreau, D. (2014), South-East Asia is the center of origin, diversity and dispersion of the rice blast fungus, Magnaporthe oryzae. New Phytologist, 201: 1440–1456. doi: 10.1111/nph.12627
- Issue published online: 3 FEB 2014
- Article first published online: 10 DEC 2013
- Manuscript Accepted: 23 OCT 2013
- Manuscript Received: 15 JUL 2013
- Agropolis Fondation
- European Community. Grant Number: Residiv ICA4-CT-2000-30021
- ANR. Grant Numbers: Genblast ANR-06-ERA-PG-013, Emerfundis ANR-Biodiv-07
- center of origin;
- Magnaporthe ;
- 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.