Volume 17, Issue 3 (11-2022)
MGj 2022, 17(3): 283-294 |
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Omrani A, Aharizad S, Roohparvar R, Khodarahmi M. Genetic analysis of resistance to wheat stem rust disease in cross of S-83-4 (Resistant) × Avoset’s’ (Sensitive). MGj 2022; 17 (3) : 5
URL: http://mg.genetics.ir/article-1-1744-en.html
URL: http://mg.genetics.ir/article-1-1744-en.html
Agricultural Research Education and Extension Organization
Abstract: (611 Views)
Black or stem rust disease with fungal agent Puccinia graminis f. sp. tritici is one of the most important and destructive wheat diseases in the world, and also,in Iran. Production of resistant cultivars (use of genetic resistance) by identifying sources of resistance, transfer of their resistance genes and pyramidization of effective resistance genes in desirable wheat genotypes (Commercial cultivars and lines under introduction which are susceptible to disease but high in yield), is the most effective method of sustainable control of this disease. Previous results of seedling stage evaluation of wheat line S-83-4 were acceptable as a resistance reaction to many stem rust pathogens in the country (2014-2016). In order to study the inheritance and type of action of genes controlling resistance components including infection type and latent period in line S-83-4, this line was crossed with sensitive cultivar Avocet'S ' and base generations F1, F2 , BC1 and BC2 were produced in farm conditions. Seedlings of parents and generations were inoculated by the high virulent race TTTTF (Boroujerd region) in greenhouse and compared based on a randomized complete block design in three replications. Weight analysis of variance showed a significant difference between generations in terms of measured resistance components (infection type and latent period). The average degree of dominance was higher than one for both traits, indicating over-dominance genetic control. Epistasis interaction effects of additive × additive and dominance × dominance were significant for the both traits. For both measured traits, broad-sense heritability was estimated as moderate, while narrow-sense heritability was low indicating meaningful effct of dominance in controlling of the both studied traits. To improve the studied traits, it is ideal to apply the selection in advanced separating generations (after reaching relative purity) resulting from crossing with S-83-4 line. According to the results of segregating genes estimates, more than one gene is involved in the genetic control of the measured resistance components. According to the results of race determination, by molecular analysis of six effective resistance genes/loci of stem rust (Sr22, Sr24, Sr25, Sr26, Sr31 and Sr39) by the respective specific markers in line S-83-4, the presence of Sr31 resistance gene, confirmed.
Article number: 5
Keywords: Broad-sense heritability, Resistance components, Infection type, Latent period, narrow-sense heritability
Type of Study: Applicable |
Subject:
Subject 01
Received: 2021/12/8 | Accepted: 2022/05/24 | Published: 2022/11/19
Received: 2021/12/8 | Accepted: 2022/05/24 | Published: 2022/11/19
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