Assessment of genetic variability for wheat yellow rust resistance and Puccinia striiformis f.sp. tritici pathotypes from Pakistan

Shaukat Hussain, Syed Jawad Ahmad Shah, Marc Leconte, Claude de Vallavieille-Pope

Abstract


After their release, commercial wheat cultivars often experience a notable decline in effectiveness against yellow rust, highlighting the crucial importance of genetic resistance studies for developing durable solutions for sustainable wheat production. This study characterized 205 wheat genotypes for seedling and adult plant (Yr18) resistance genes, using 14 diverse races of Puccinia striiformis f.sp. tritici (Pst). Additionally, 75 Pst isolates sampled during 2008 were also analyzed. Seedling resistance in 16 genotypes remained undetermined. Twelve resistance patterns emerged: 82 genotypes showed susceptibility across all pathotypes, while 10 displayed consistent resistance. Fifty-seven genotypes were inferred to carry Yr2, Yr3, Yr6, Yr7, Yr9, and an unknown gene. Yr18 prevalence was observed in 29 cultivars but was absent in landraces. Eight resistance spectra were shared between landraces and cultivars, and four were cultivar-specific (Yr6+Yr7, Yr9+Yr17, and Yr18). Many landraces carried defeated resistance genes, as evident from prevalent pathotypes in the 2006 and 2008 surveys in Khyber Pakhtunkhwa, Pakistan. The low frequency of resistance genes in Pakistani cultivars underscores the need for increased use of undefeated seedling resistance genes and Yr18-associated cultivars for effective disease control.


Keywords


Yellow rust, wheat; Puccinia striiformis f.sp. tritici; resistance gene postulation; Yr genes; Pakistan.

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References


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DOI: https://doi.org/10.33804/pp.008.02.5177

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