Population biology and invasion history of puccinia striformis F.SP. tritici at worldwide and local scale
type: Dataset
contact point: Organization
  fn: CCSD
keyword: infoeu-reposemanticsdoctoralthesis
keyword: lhistoire-des-invasion
keyword: fungal-pathogen
keyword: puccinia-striiformis
keyword: structure-des-populations
keyword: recombination-genetique
keyword: population-structure
keyword: sdvsalife-sciences-q-bioagricultural-sciences
keyword: champignon-pathogenes
keyword: genetic-recombination
keyword: theses
keyword: invasion-history
landing page: https://theses.hal.science/tel-00806507
description: Analyses of the large-scale population structure of pathogens enable the identification of migration patterns, diversity reservoirs or longevity of populations, the understanding of current evolutionary trajectories and the anticipation of future ones. A detailed analysis of populations in centre of diversity should enable to infer the adaptive capacity of the pathogen and identify potential sources for new invasions. Puccinia striiformis f.sp. tritici (PST) is the causal agent of wheat yellow/stripe rust, and despite a worldwide distribution, this fungus remains a model species for invasion studies, due to its long-distance migration capacity and recurrent local emergence of new strains. Little is known about the ancestral relationship of the worldwide PST population with unknown center of origin. We used multilocus microsatellite genotyping to infer the worldwide population structure of PST and the origin of new invasions, analysing a set of isolates representative of sampling performed over six continents. Bayesian and multivariate clustering methods partitioned the isolates into six distinct genetic groups, corresponding to distinct geographic areas. The assignment analysis confirmed the Middle East-Red Sea Area as the most likely source of newly spreading, high-temperature-adapted strains; Europe as the source of South American, North American and Australian populations; and Mediterranean-Central Asian populations as the origin of South African populations. The existence of strong population subdivision at worldwide level shows that major genetic groups are not markedly affected by recent dispersal events. However, the sources for recent invasions and the migration routes identified emphasize the importance of human activities on the recent long-distance spread of the disease. The analyses of linkage disequilibrium and genotypic diversity indicated a strong regional heterogeneity in levels of recombination, with clear signatures of recombination in the Himalaya…
identifier: NNT: 2012PA112162
issued: 2026-05-11T19:44:38.836045
language: en
modified: 2026-05-11T19:44:38.836049

test_moissonnage_selune
type: Agent

Population biology and invasion history of puccinia striformis F.SP. tritici at worldwide and local scale
type: Distribution
access URL: https://theses.hal.science/tel-00806507
format: HTML
issued: 2026-05-11T19:44:38.846573
modified: 2026-05-11T19:44:38.806090