فهرست مطالب z. khodarahmpour

The genus Stachys L., (Lamiaceae family) has several spicy and aromatic species. In order to investigate the diversity of aerial biomass, morphological traits, and essential oil yield, 47 populations out of five species including S. lavandulifolia, S. laxa, S. inflata, S. germanica and S. byzantina were evaluated during two years, at a research farm in Khorramabad, Iran. The traits such as plant height, leaf length, leaf width, stem number, stem diameter, vegetation cover, 1,000 seed weight, and aerial dry (DM) yield in all 47 populations were measured. The essential oil was extracted using the hydrodistillation method with a Clevenger-type apparatus. The essential oil compounds were detected using GC and GC/MS. Data were analyzed using nested ANOVA with Minitab16 software. The results showed that both S. germanica and S. byzantina had higher aerial biomass than the other species. The Saveh and Tehran populations of S. inflata, the populations of Qazvin and Qorveh in S. lavandulifolia, and the populations of Ardebil and Semirom in S. Byzantine were superior to the others for the measured traits. For essential oil yields (w/w), the highest and lowest values were 2.0 and 0.8%, obtained in S. byzantina and S. lavandulifolia, respectively. Phytochemical analyses of S. lavandulifolia identified 43 compounds. The main compounds were β-eudesmol (3.48%), germacrene-D (4.59%), δ-cadinol (4.69%), bicyclogermacrene (6.85%), δ-cadinene (9.69%), spathulenol (10.08%) and α-cadinol (12.86%). S. lavandulifolia, with early maturity and higher essential oil, was recommended for domestication and breeding of improved varieties.

In this study, to evaluate the seed vigor tests associated with the seedling field emergence and yield of clover cultivars three separate experiments consisted of germination test and seed accelerated aging test in a completely randomized design with 4 replications in Islamic Azad University, Ahvaz and culture in the city of Shoushtar in a randomized complete block design with three replications on 11 cultivars and accessions of clover of 3 species (T. pratense, T. alexandrinum and T. resupinatum) was conducted in 2014. Traits of germination percent, germination rate, seedling fresh weight and dry weight measured in laboratory conditions and traits of seedling field emergence percent and rete, height of plant, number of stem in plant and dry forage yield in field conditions. The results showed that seed accelerated aging test reduces seed germination percent (21%), germination rate (59%) and fresh weight (6%) and dry weight (48%) respectively. In terms of percent and rate of germination and seedling emergence in 3 experiments varieties of Berseem Multicut and Berseem Sucromont were superior cultivars. The maximumu of the dry forage yield of 9.26 tons per hectare belonged to Berseem Multicut. So it became clear that species of Alexandrinum. is compared to other species in the city of Shoushtar. The results of canonical correlation analysis between showed that between stem characteristics in farm and germination components and growth in germination test and seed accelerated aging test there are significant relationships. Therefore the seed accelerated aging test and germination test well could emergence percent and plant establishment of clover in the field predict.

In this study, to evaluate the seed vigor tests associated with the emergence and yield of forage sorghum, three separate experiments consisted of standard germination test and seed deterioration test in a completely randomized design with four replications in Islamic Azad University, Ahvaz and culture in the city of Shoushtar were conducted. 8 genotypes of forage sorghum in a randomized complete block design with three replications was conducted in 2014.Analysis of variance showed that there were significant differences between genotypes in all three experiments for all traits except seedling length in standard germination test. The results showed that seed deterioration test reduces seed germination percentage (39%), germination rate (38%), seedling length (11%) and fresh weight (40%) and dry weight (13%).In terms of percentage and rate of germination and emergence in three experiments, genotype KFS18 was superior genotype. The maximum of the dry forage yield of 9.5 tons per hectare belonged to genotypes KFS2 and KFS18. So it became clear that superior genotype was KFS18.The results showed that the correlations between the percentage of germination and emergence and biomass production in field experiments with standard germination test and seed deterioration test were significant. The seed deterioration test and standard germination test could predict emergence of sorghum in the field.