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2017, Volume 4, Issue 1

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Frontiers of Agricultural Science and Engineering >> 2017, Volume 4, Issue 1 doi: 10.15302/J-FASE-2016114

Determination of heterozygosity for avirulence/virulence loci through sexual hybridization of

. State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling 712100, China.. China-Australia Joint Research Centre for Abiotic and Biotic Stress Management, Northwest A&F University, Yangling 712100, China

Accepted: 2016-11-30 Available online: 2017-03-06
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Abstract

Wheat stripe rust caused by f. sp. is one of the most devastating diseases of wheat worldwide and resistant cultivars are vital for its management. Therefore, investigating the heterozygosity of the pathogen is important because of rapid virulence changes in isolates heterozygous for avirulence/virulence. An isolate of f. sp. was selfed on to determine the heterozygosity for avirulence/virulence loci. One hundred and twenty progeny isolates obtained from this selfing were phenotyped using 25 lines of wheat containing genes and genotyped with 96 simple sequencing repeat markers, with 51 pathotypes and 55 multi-locus genotypes being identified. All of these were avirulent on lines with , , , and and virulent on lines with , and , indicating that the parental isolate was homozygously avirulent or homozygously virulent for these loci. Segregation was found for wheat lines with , , , , , , , , , , , , , , , and . The 17 cultivars to which the was identified as heterozygous with respect to virulence/avirulence should not be given priority in breeding programs to obtain new resistant cultivars.

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