Pathotypic evolution in Puccinia striiformis in India during 1995 - 2004

Abstract

Yellow rust pathogen (Puccinia striiformis) distribution was monitored in different wheat-production zones (north-western plains zone, north hills zone, and south hills zone) of India during the last decade (1994–2004). Studies indicated the predominance of 3 pathotypes: 46S102 (46E149), 47S103 (47E148), and 46S119 (46E149+Yr9) in the north-western plains zone. These pathotypes were detected for the first time in 1995–96 and are evolving frequently. Another pathotype (78S84), although present in low frequency, was first detected from northern India and is virulent on Yr9 and Yr27, posing a major threat to cv. PBW343, which carries these genes. The high altitudes of the northern hills where very primitive wheat cultivars are grown showed less variability for the yellow rust pathogen. Continued breeding efforts and replacement of cultivars have resulted in low specialisation in the yellow rust pathogen in the south hills zone and pathotype 38S102 predominated in this area during the last decade.

Inheritance of temperature-sensitive leaf rust resistance and adult plant stripe rust resistance in common wheat cultivar PBW343

“…This resistance gene, undoubtedly Yr27 (McDonald et al 2004), conferred a high level of resistance to pt. 46S119 in the field (Prashar et al 2006(Prashar et al , 2007. An additional factor for moderate adult plant resistance was also detected in the field.…”

Recovery and virulence phenotyping of the historic ‘Stubbs collection’ of the yellow rust fungusPuccinia striiformisfrom wheat

“…Wheat genotypes carrying Yr27 (such as PBW343 and Inqilab 91) became widely grown from the mid-1990s, in particular in India and Pakistan where Yr27 was deployed on at least 11 million ha but also in other West and Central Asian countries (Singh et al, 2004a). Virulence for Yr27 was detected in India in 2001 and caused epidemics within few years because of the breaking down of the resistance in PBW 343 (Prashar et al, 2007), and in Pakistan, the resistance became ineffective in Inqilab 91 in 2005 (Duveiller et al, 2007). This study documented the presence of virulence for Yr27 already in the early 1970s in two samples collected in the Middle East and in three samples from Pakistan (Table 5).…”

Pathotypic and molecular evolution of contemporary population of Puccinia striiformis f. sp. tritici in Egypt during 2016–2018

“…In Egypt, the disease appeared in epidemic cases in 1967, 1983 and 1996 (El‐Daoudi et al, ). In recent years, evidence of increased aggressiveness of the disease in Egypt has been reported (Ashmawy, Abu‐Aly, Youseef, & Shahin, ); this may be due to the pathotypic evolution of the races that are able to overcome the resistance sources of wheat (Prashar, Bhardwaj, Jain, & Datta, ). The fungus has a complex life cycle that involves five spore stages and alternate hosts ( Berberis spp.…”