Document Type : Original Article
Authors
1
1. Ph.D. student, Department of Plant Breeding and Biotechnology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2
Professor, Department of Plant Breeding and Biotechnology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
3
Assistant Professor, Department of Plant Breeding and Biotechnology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
4
Professor, Department of Genebank, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Leibniz, Germany
5
Associate Professor, Department of Agronomy and Plant Breeding Sciences, College of Aburaihan, University of Tehran, Pakdasht,, Iran
Abstract
wheat brown rust is caused by Puccinia recondita f. sp. tritici. This research was conducted in three years from 2019 to 2021 to investigate the resistance of 192 spring bread wheat cultivars to brown rust. Based on the area under the disease progress curve (AUDPC) criteria, in the first year, the genotypes were grouped into resistant, moderately resistant, moderately susceptible and susceptible; in the second year, they grouped into resistant, moderately resistant, and moderately susceptible, and in the third year into five groups of resistant, moderately resistant, susceptible, moderately susceptible, and highly susceptible. A complete randomized block design with two replicates was used in each year. Mean AUDPC trait for the studied cultivars in the three years was 154.04, 107.08, and 296.66% per day, respectively. Furthermore, the results of the analysis of variance in the three years showed that the genotypes are significantly different in their evaluated traits at 0.01 significant level. The highest significant positive correlation coefficient was observed between percentage severity and AUDPC (r=0.960-0.981), percentage severity and infection type (r=0.833-0.855), and infection type and AUDPC (r=0.864-0.829). Investigating the genetic diversity of resistance to brown rust disease using AUDPC and estimating the level of resistance in this population of spring bread wheat genotypes showed significant diversity among the genotypes that can be emploied in bread wheat breeding programs.
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