yousef safavi; Ali Ashraf Jafari; Mehrnaz Riasat
Volume 23, Issue 2 , September 2016, , Pages 254-244
Abstract
In this study, the effects of water stress on seedling growth characteristics were studied in Agropyron tauri and Agropyron repens. The experiments were conducted in the greenhouse of Fars Agricultural and Natural Resources Research and Education Center in 2010. Six Agropyron repens genotypes and ...
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In this study, the effects of water stress on seedling growth characteristics were studied in Agropyron tauri and Agropyron repens. The experiments were conducted in the greenhouse of Fars Agricultural and Natural Resources Research and Education Center in 2010. Six Agropyron repens genotypes and four Agropyron tauri genotypes were selected from the gene bank of Research Institute of Forests and Rangelands and were arranged in a factorial experiment in a completely randomized design with three replications. Factors A and B were the genotypes and drought levels, respectively. Drought stress levels were 100, 75, 50 and 25% of field capacity, and the measured characteristics were shoot length, root length, root/shoot ratio, seedling length, seedling fresh weight, seedling dry weight, dry weight/fresh weight ratio, and leaf area. There were statistically significant differences among drought treatments, genotypes, and interaction effects of accessions with land, in most of the above characteristics. Five drought resistance indices including stress susceptibility index (SSI), tolerance index (TOL), stress tolerance index (STI), mean productivity (MP), and geometric mean productivity (GMP) were calculated. By assigning the highest indices, the genotype A.tauri (99) showed the highest resistance in most of the traits tested.According to the obtained results, genotype A.tauri (99) as the best and genotypes A. repens (211), A. repens (217), A. repens (224), and A. repens (225) in the next rank could be recommended for rangeland improvement and reclamation in arid regions.
Jalil Karimzadeh; Hasan Monirifar; Akbar Abdi Ghazijahani; Ahmad Razban Haghighi
Volume 19, Issue 4 , March 2013, , Pages 693-702
Abstract
In order to study the grouping of Agropyron tauri populations, 13 populations were investigated in a randomized complete blocks design with three replications. The study was performed in research field of Islamic Azad University of Tabriz in 2010. In this study, a number of traits including plant height, ...
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In order to study the grouping of Agropyron tauri populations, 13 populations were investigated in a randomized complete blocks design with three replications. The study was performed in research field of Islamic Azad University of Tabriz in 2010. In this study, a number of traits including plant height, tiller number, leaf number, flag leaf length, first leaf length, second leaf length, first internode length, second internode length, crown cover, fresh yield, dry yield, fresh weight of single plant and dry weight per plant were evaluated. Analysis of variance showed significant differences among populations for all measured traits. Thirteen populations were classified into three clusters by cluster analysis of standardized data, based on Euclidean distance and Ward method. This result was in consistent with the height of geographic regions from which populations were collected. In principal components analysis, four components were introduced, and the traits of fresh and dry yield showed high and positive coefficients in first component. Results of cluster analysis were confirmed by results of principal components analysis.
Zainab Nurikiya; Akbar Javadi; Akbar Fakhireh; Ali Tavili; Mohammad ali Zare chahouki; Hamid reza Abbasi
Volume 16, Issue 4 , January 2010, , Pages 574-585
Abstract
The purpose of this research was to compare the amount of N, P and K in the soil under three rangeland species i.e. Agropyron tauri, Astragalus ammodendron and Bromus tomentellus and (with) the soil properties of the control area. After identifying the habitats (sites) of the mentioned species, soil ...
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The purpose of this research was to compare the amount of N, P and K in the soil under three rangeland species i.e. Agropyron tauri, Astragalus ammodendron and Bromus tomentellus and (with) the soil properties of the control area. After identifying the habitats (sites) of the mentioned species, soil sampling was done in all key areas at the end of the growing season based upon randomized systematic method. In order to study the features of the mentioned species, 10 plots (1 m2) were established along 4 transects.Soil sampling was carried out in the beginning and in the end of all transects from 0-10 and 10-40 cm soil depths. Soil sampling was also done in the control area and then N, P and K were measured. All data were analyzed and compared by T test. The results indicate that the amount of N, P and K in the first soil depth beneath Agropyron tauri is more than that in Astragalus ammodendron and Bromus tomentellus. In most cases the amount of N and K in the soil beneath (under) the species are more than that in the control area which indicates the increase of fertility in the soil beneath the species in comparison to the control area and it can be due to the litter fall or intensified biological activities of the organisms.