Table 1. Sampling regions and number of isolates selected for the analysis of the worldwide population structure of wheat yellow rust pathogen Puccinia striiformis f.sp. tritici.
| Geographical origin | Country | Number of isolates | Sampling year |
| Older native populations | |||
| South-East Asia | China | 71 | 2004–05 |
| Nepal | 55 | 2008 | |
| Pakistan | 68 | 2004–2006, 2008 | |
| Middle-East | Afghanistan | 7 | 2009 |
| Cyprus | 9 | 2005–2006 | |
| Iran | 17 | 2005 | |
| Israel | 7 | 2005–2006 | |
| Lebanon | 5 | 2006 | |
| Turkey | 10 | 2005 | |
| Yemen | 12 | 2003, 2005 | |
| East Africa | Eritrea | 23 | 2002–2005 |
| Central Asia | Azerbaijan | 11 | 2005 |
| Kazakhstan | 6 | 2005 | |
| Kyrgyzstan | 7 | 2005 | |
| Uzbekistan | 1 | 2003 | |
| Mediterranean area | Algeria | 7 | 2005–2006 |
| Italy | 2 | 1998–2006 | |
| Morocco | 2 | 2006 | |
| Portugal | 4 | 2006 | |
| Spain | 2 | 2006 | |
| Tunisia | 4 | 2005, 2007 | |
| NW Europe | Denmark | 7 | 1995–2002 |
| France | 5 | 1997–2008 | |
| United Kingdom | 5 | 1975, 1978, 1991–1998 | |
| Recent invasions | |||
| North America | Mexico | 2 | 1989, 2002 |
| USA | 10 | 1981–1983, 1991–1997 | |
| South America | Argentina | 1 | 2010 |
| Brazil | 6 | 2010 | |
| Chile | 7 | 2010 | |
| Uruguay | 10 | 2010 | |
| South Africa | South Africa | 6 | 1996–2004 |
| Aggressive isolates | Australia | 4 | 2002–2004 |
| Denmark | 7 | 2001–2006 | |
| France | 1 | 1997 | |
| Mexico | 2 | 2002–2003 | |
| USA | 6 | 2000–2005 | |
| Total | 409 | ||