Genetic analysis of resistance to stripe rust in cross of commercial bread wheat cv. Aflak × Avocet

Document Type : Research Paper

Authors

1 Field and Horticultural Crops Research Department, Ardabil Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization, Moghan, Iran.Research, AREEO, Moghan, Iran.

2 Seed and Plant Improvement Institute, Agricultural Research Education and Extension Organization, Karaj, Iran.

Abstract

Stripe rust caused by Puccinia striiformis f. sp. tritici (Pst) is one of the most devastating wheat diseases worldwide. Identification of virulence factors of the pathogenas well as using resistant cultivars are effective approaches in controlling wheat strip rust. Knowledge of genetic basis of resistance to stripe rust in commercial wheat cultivars is an important objective to ensure that diverse resistance genes are deployed in breeding programs.Five bread wheat commercial cultivars were evaluated for stripe rust using 40 Pst races that were collected from different locations in Iran. Among them cultivar Aflak showed seedling resistance to all races and the other cultivars displayed field resistance at the adult plant stage. To study the heritability and genetic basis of resistance to stripe rust inbread wheat cv. Aflak, it was crossed with susceptible cultivar Avocet‘s’ and F1, F2, BC1 and BC2 generations were developed. The generations along with their parents were planted in Randomized Complete Block Design (RCBD) with three replications under greenhouse conditions. The seedlings were inoculated using the race 230E158A+, Yr27+ urediniospores. The resistance components including infection type, latent period, pustule size and pustule density were recordedon single plants of each generation. The results ofthe weighted analysis of variance showed that there were significant (p ≤ 0.01) differencesamong generations for each of the four traits. Generations mean analysis showed that in addition to additive and dominance effects, epistasis, particularly the additive × dominance epistasis also played a significant role in controlling resistance to stripe rust.For all traits, high broad-sense heritability was observed. Moderate to high narrow-sense heritability wasestimated for resistance components

Keywords

References

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Crop Breeding Journal
Volume 9, Issue 2
February 2019
Pages 61-70

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