Virulence survey of Puccinia striiformis, the causal agent of wheat yellow rust, by trap nursery 2010–2012

Abstract

Wheat yellow (stripe) rust, caused by the fungus Puccinia striiformis f. sp. tritici, is an important disease in most of the wheat-growing parts of Iran. Use of resistant cultivar is the best method to control the disease. This study was carried out to identify the virulence factors of stripe rust in Khuzestan province in south of Iran (warm zone) for 2 years (2010–2011 and 2011–2012) and use this information in the breeding programme. For this purpose, the trap nursery was included 41 lines of standard sets of stripe rust with different gene and Bolani and morocco as susceptible check. In the flag leaf stage when the susceptible check (Bolani and morocco) was 90–100S (Susceptible), all lines were scored for stripe rust. Data showed that virulence for genes included Yr6, Yr7, Yr9, Yr27 and YrA. For genes Yr1, Yr3, Yr4, Yr5, Yr8, Yr10, Yr15, YrCV, YrND, YrSU, YrSP and YrSD, virulence was not detected.

Keywords:

• wheat
• yellow rust
• virulence factors
• resistance