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Showing 2 results for Hatami Maleki
Volume 3, Issue 1 (3-2014)
Abstract
Black stem is one of the most important fungal diseases of sunflower which is caused by Phoma macdonaldii. This research was conducted to clarify the interactions between a few breeder lines and wild-type accessions of sunflower with seven isolates of Phoma macdonaldii, the causal agent, under controlled conditions. The experiment was carried out in randomized complete block design with three replications. Each replication consisted of 30 seedlings. Twenty micro liters of spore suspension was deposited at the intersection of the cotyledon petiole and hypocotyl of four-leaf-stage sunflower seedlings as well. Three, five and seven days after inoculation, seedlings were scored on a 1-9 scale for percentage of necrotic area. Highly significant differences were observed among genotypes, isolates and their interactions for disease severity 7 days after inoculation based on AUDPC (Area Under Disease Progress Curve) values. Two models of GGE biplot including Isolate-based and genotype-based models were used to study the pathogenicity of the isolates and susceptibility of sunflower, respectively. Isolate-focused biplot revealed that there was a considerable difference between virulence of isolates. Based on genotype-focused biplot model, accessions including 665 Iowa, 1012 Nebraska, 211 Illinois and 1016 Nebraska were more resistant to studied isolates of P. macdnaldii. Results revealed that GGE biplot approach could lead to good understanding about interactions between sunflower genotypes and Phoma macdonaldii isolates.
B. Rahnemoun , H. Hatami Maleki, R. Mohammadi ,
Volume 9, Issue 4 (Fall 2018)
Abstract
Aims: The perennial grass is one of important grassland plants, which have special importance based on their feeding production, protection, and prevention of soil erosion. One of the important genera of the wheat family is the Agropyron. The aim of this study was to evaluate genetic variability in different accessions of Agropyron based on morphological traits.
Materials and Methods: In this experimental research, 31 populations belonging to the 3 species of the Agropyron were evaluated in a randomized complete block design (RCBD) with 3 replications in research farm of Agricultural Biotechnology Research Institute of Northwest and West region of Iran. The cluster analysis was performed by SPSS 17, using Euclidean space and UPGMA and the principal components analysis was performed through trait correlation coefficient matrix and Minitab 14 software.
Findings:
The highest value of phenotypic coefficient of variation was seen in traits, including panicle length, fresh forage yield in the first cutting, and dry matter yield in the first cutting, respectively. In the second component, seed yield and crown diameter were the most important in explaining this component. There were significant differences between different populations in terms of morphological traits, so that for these traits, the various species in this genus could be separated. From a morphological point of view, there was a great similarity between A. cristatum and A. desertorum.
Conclusion: Different populations of A. elongatum species could be distinguished from the populations of the A. cristatum and A. desertorum in terms of morphological traits, while utilization of molecular markers is mandatory to segregate the populations of A. cristatum and A. desertorum from each other.
