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Analysis of Resistance to Fusarium Head Blight (FHB) among the Elite Lines of Wheat from the North Warm and Humid Zone of Iran
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Ali Malihipour *   , Mohammadali Dehghan , Kamal Shahbazi |
| Cereal Research Department, Seed & Plant Improvement Institute (SPII), AREEO, Karaj, Iran , a.malihipour@areeo.ac.ir |
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Abstract: (174 Views) |
Fusarium head blight (FHB), caused mainly by Fusarium graminearum, is one of the most important diseases of wheat especially in the North warm and humid zone in Iran. In order to identifying FHB-resistant wheat lines, the reaction of 20 elite lines of wheat from the North warm and humid zone of Iran were determined to FHB along with the susceptible check, the wheat cultivar Falat, under field conditions in 2014-15 in Gorgan and Moghan and in 2015-16 in Moghan, Iran. In order to identify type II resistance in these lines, their response to the disease was also investigated in the greenhouse in Karaj, Iran. Combined analysis of variance of data for several datasets including disease incidence, severity, and index and Fusarium-damaged kernels (FDK) from three environments showed significant differences among the genotypes. Evaluation of the genotypes showed that the commercial wheat cultivar Morvarid along with five lines including N-93-6, N-93-12, N-93-15, N-93-18, and N-93-19 having lower mean disease incidence, severity, and disease index and FDK under field conditions and less disease severity in the greenhouse, were more resistant to FHB. It seems that the presence of type I resistance in these lines has reduced their disease. In this study, the results of measuring different genetic parameters showed large differences between different traits. In terms of comparing the genetic and phenotypic coefficients of variation between different traits, the three traits including Fusarium-damaged kernels (FDK), disease incidence, and disease index had the highest coefficients of variation compared to the other traits including disease severity under field and greenhouse conditions. In addition, FDK had the highest ratio of genetic to phenotypic coefficient of variation. Finally, the two traits including FDK and disease severity under field conditions had the highest values of broad-sense heritability (68 and 60 percent, respectively). |
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| Keywords: Fusarium-damaged kernels (FDK), Disease index, Disease incidence, Disease severity, Type II resistance, Fusarium graminearum |
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Type of Study: Research |
Subject:
Molecular genetics
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