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Determination of Rust Resistance Gene Complex L r34/ Y r18 in Spring Wheat and its Effect on Components of Partial Resistance
Author(s) -
Qamar Maqsood,
Gardezi Dilnawaz Ahmed,
Iqbal Muhammad
Publication year - 2012
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.2012.01957.x
Subject(s) - biology , allele , genotype , gene , rust (programming language) , seedling , resistance (ecology) , wheat leaf rust , horticulture , stripe rust , botany , genetics , plant disease resistance , agronomy , virulence , computer science , programming language
The non‐durable nature of hypersensitive (race‐specific) resistance has stimulated scientists to search for other options such as race‐non‐specific resistance to provide long‐lasting protection against plant diseases. Adult plant resistance gene complex L r34/ Y r18 confers a dual race‐non‐specific type of resistance to wheat against stripe rust ( P uccinia striiformis f. sp . tritici ) and leaf rust ( P . triticina Eriks). This study was conducted to evaluate 59 spring bread wheat ( Triticum aestivum L .) genotypes for the presence of the L r34 / Y r18 ‐linked cs LV 34 allele using STS marker cs LV 34 and to determine the effect of this gene complex on the components of partial resistance in wheat to leaf/stripe rust. L r34 / Y r18 ‐linked cs LV 34 allele was detected only in 12 genotypes, namely I qbal 2000, NR ‐281, NR 354, NR 363, NR 364, NR 366, NR 367, NR 370, NR 376, 4 th EBWYT 509, 4 th EBWYT 510 and 4 th EBWYT 518. Eleven genotypes showing the amplified L r34/ Y r18 ‐linked allele were further studied for the assessment of the effect of L r34/ Y r18 on components of partial resistance along with nine genotypes lacking this gene complex. Both stripe and leaf rusts were studied separately. The components of partial resistance including latency period ( LP ) and infection frequency ( I F) were studied on primary leaf (seedling stage), fourth leaf and fully expanded young flag leaf (adult plant stage). Both the stripe and leaf rust fungi showed a prolonged LP and reduced IF on genotypes carrying L r34/ Y r18 gene complex. Generally, a longer LP was associated with a reduced IF at all growth stages. Although significant effect of L r34/ Y r18 gene complex on LP and IF was observed almost at all three growth stages, the effect was more pronounced at flag leaf. This suggested that L r34/ Y r18 gene complex is more effective at later stages of plant growth.