Evolutionary history of the mitochondrial genome in Mycosphaerella populations infecting bread wheat,durum wheat and wild grasses |
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| Authors: | Stefano FF Torriani Patrick C Brunner Bruce A McDonald |
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| Institution: | 1. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, P.R.China;2. College of Resources and Environment Science, Hebei Agricultural University, Baoding 071001, P.R.China;3. Key Laboratory of Plant-Soil Interactions, Ministry of Education, Beijing 100193, P.R.China;4. National Agricultural Technology Extension and Service Center, Ministry of Agriculture and Rural Affairs, Beijing 100125, P.R.China;1. National Observation Station of Hailun Agro-ecology System/Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, P.R.China;2. University of Chinese Academy of Sciences, Beijing 100049, P.R.China;1. School of Science, Monash University Malaysia, 46150 Bandar Sunway, Selangor, Malaysia;2. School of Biological Sciences, University of Western Australia, Perth, Australia;3. Rice Research Center, Malaysian Agricultural Research and Development Institute (MARDI), MARDI Seberang Perai, 13200 Kepala Batas, Pulau Pinang, Malaysia;4. Department of Agriculture, Sabah, Malaysia;5. Monash University Malaysia Genomics Facility, Tropical Medicine and Biology Multidisciplinary Platform, 47500 Bandar Sunway, Selangor, Malaysia;1. U.S. Department of Agriculture, Agricultural Research Service, 1815 North University Street, Peoria, IL 61604, USA;2. 23 Healy Crescent, Winnipeg, Manitoba R2N 2S6, Canada;3. Lacombe Research Centre, Agriculture and Agri-Food Canada, 6000 C and E Trail, Lacombe, Alberta T4L 1W1, Canada;4. Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba R3T 2M9, Canada;5. USDA-ARS, Cereal Disease Laboratory, University of Minnesota, 1551 Lindig Avenue, St. Paul, MN 55108, USA;1. Advance Centre for Computational & Applied Biotechnology, Uttarakhand Council for Biotechnology, Dehradun 248007, India;2. Bioinformatics Centre, Biotech Park, Lucknow 226018, India;3. Centre for Excellence in Mountain Biology, Uttarakhand Council for Biotechnology, Biotech Bhavan, Haldi, U.S. Nagar 263146, India;4. Bioclues. Org, Kukatpally, Hyderabad 500072, Telangana, India;5. Bioinformatics Organization, 28 Pope St, Hudson, MA 01749, USA;6. Institute of Biotechnology, Professor Jayashankar Telangana State Agricultural University, Rajendra Nagar, Hyderabad 500030, India |
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| Abstract: | Plant pathogens emerge in agro-ecosystems following different evolutionary mechanisms over different time scales. Previous analyses based on sequence variation at six nuclear loci indicated that Mycosphaerella graminicola diverged from an ancestral population adapted to wild grasses during the process of wheat domestication approximately 10,500 years ago. We tested this hypothesis by conducting coalescence analyses based on four mitochondrial loci using 143 isolates that included four closely related pathogen species originating from four continents. Pathogen isolates from bread and durum wheat were included to evaluate the emergence of specificity towards these hosts in M. graminicola. Although mitochondrial and nuclear genomes differed greatly in degree of genetic variability, their coalescence was remarkably congruent, supporting the proposed origin of M. graminicola through host tracking. The coalescence analysis was unable to trace M. graminicola host specificity through recent evolutionary time, indicating that the specificity towards durum or bread wheat emerged following the domestication of the pathogen on wheat. |
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