نشریه علوم و فناوری بذر ایران
سال سیزدهم شماره 2 (پیاپی 34، تابستان 1403)

This research was done in order to find the most effective treatment to break the hardness of Persian camelthorn (Alhagi camelorum) seeds, which is one of the major problems of its cultivation on a large scale. treatments including 98% sulfuric acid (treatments of 25, 30 and 35 minutes) and 100°C hot water (treatments of 30 seconds, 1 and 3 minutes) were performed in comparison with the control. The factorial experiment was conducted in the form of a completely randomized design. The results showed that the populations had significant differences in terms of all traits and the difference between seed hardness treatments and their interaction effects for all traits was significant at the 1% level. The results of the findings show that the presence of the hard shell is a physical barrier and it acts as factors limiting germination by preventing the expansion of the embryo or by limiting water absorption and gas exchange. Therefore, applying a series of seed scratching treatments such as sulfuric acid treatment and 100°C water will improve the germination of the camelthorn seed. Because the use of treatments such as sulfuric acid involves problems such as the risk of working with acid, and also due to the cheapness and availability of water, the lack of special facilities and materials, the harmlessness and simplicity of working with it to stimulate germination and remove hardness, 100 °C water for 30 seconds and placement of seeds in 30 °C germinator is the priority for treating Iranian seeds.

Yarrow (Achillea) is one of the most important species of medicinal plants that has many applications in the pharmaceutical, cosmetic and health industries. In order to investigate the effect of seed priming on the germination characteristics of degenerate seeds,, A factorial As the form of completely randomized design with 3 replications carried in the greenhouse of the Natural Resources Gene Bank of Research Institute Forests and Rangeland in 2022.. I, three yarrow species, Achillea.nobolis, A.millifolium and A.tenufolia, were artificially senesced by applying a temperature of 40 degrees Celsius and a relative humidity of 100% (for 0, 48 hours, 72 hours), seed priming at 3 levels, including hydropriming (soaking for 24 hours in distilled water), gibberellic acid, 250 and 500 ppm. The analysis of variance showed that there were main and interaction effects of species, seed priming and seed deterioration for all the traits of emergence Characteristics were significant at P≤ 1% . Comparison of the species showed , that of A. nobolis species higher values of all traits except for dry matter compare with two other species.The species of A. millifolium was ranked as second level. The highest emergence rate was obtained in non- deteriorated (hydro) seeds. Three species have high average mean values with gibberellic acid 250 ppm for all traits except the ratio of root/stem and percentage of dry matter. . The highest root length /Shoot were obtained with gibberellic acid 250 ppm, which indicates that the aged seeds inside Pots have more rooting improvement for their survival

With the aim of evaluating the effect of salicylic acid in improving the efficiency of the aged pumpkin seeds under drought stress conditions, a factorial experiment was carried out in the form of a completely randomized design with three replications. Pretreatment of different concentrations of salicylic acid including zero (pretreated with water), 1 and 1.5 mM at different drought levels of zero, -0.2, -0.4 and -0.6 MPa were investigated. Indicators of mean germination time, germination percentage, seedling length, seed vigor, membrane electrolyte leakage, soluble carbohydrates, soluble proteins, malondialdehyde, ascorbate peroxidase activity, superoxide dismutase and catalase enzymes were evaluated. The results showed that the pretreatment of seeds with different concentrations of salicylic acid prevented the significant decrease in the germination indices of the deteriorated pumpkin seeds under drought stress. So that at the potential of -0.6 MPa, the treatment of seeds with 1.5 mM salicylic acid increased the percentage of germination, seed germination index, soluble carbohydrates and soluble proteins respectively 80.2, 169.4, 51.6, 93.4% and for the activity of ascorbate peroxidase, superoxide dismutase and catalase enzymes, 41.2%, 12% and 11.8%, respectively, compared to the control. Based on the research findings, pretreatment of salicylic acid (1.5 mM) is recommended in order to reduce the oxidative stress caused by drought for pumpkin.

The aim of this study was to investigate the relationship between the morphometric characteristics of the seeds of different buckwheat (Fagopyrum esculentum Möench) lots obtained from different planting dates (29th Aug: 1, 13th Sep: 2, 28th Sep: 3 and 12th Oc: 4) with its seed germination quality under different temperature treatments. For each of seed lot, four separate experiments with 11 temperature levels including 4, 7, 10, 15, 20, 25, 30, 35, 37, 40 and 45 °C were carried out in a completely randomized design with 3 replications in seed science and technology laboratory of Agricultural Sciences and Natural Resources of Khuzestan University in 2022. The results of analysis of variance demonstrated that temperature has a significant effect at the level of 1% on germination rate index. According to the model parameters and of course the standard error, the segmented model was chosen as the best model. Based on this, according to the superior (segmented) model, the base, optimal and ceiling temperatures for lot 1 are 4.82, 34.24 and 44.82 degrees Celsius respectively, in lot 2 they are 4.18, 33.82 and 46 respectively. 44.0 degrees Celsius, in lot 3 it was estimated 5, 34.64 and 43.87 degrees Celsius respectively and in lot 4 it was estimated 5, 31.69 and 44.27 degrees Celsius respectively. Identify the cardinal temperatures can be of great help in managing the optimal sowing date of crops.

Tomato (Solanum lycopersicum L.) is one of the most important and popular fruit vegetables, to enter a new variety of tomato in the national list of plant varieties of Iran or to obtain the right of a breeder, it is a legal requirement to perform a Distinctness, Uniformity and Stability examination. In order to provide morphological description and evaluation of Distinctness and Uniformity19 tomato varieties (15newvarieties and 4check varieties) were examined under greenhouse conditions in 2021and 2022.The experiment was carried out using a completely randomized design with two replications. Varieties were distinguished based on qualitative, pseudo qualitative and quantitative traits such as green shoulder in fruit, fruit shape in longitudinal section, fruit firmness ,Inflorescence type, ribbing at peduncle end in fruit, blistering of leaf, size of blossom scar, size of peduncle scar, depression at peduncle end in fruit, anthocyanin coloration in the upper part of the stem, leaf attitude, intensity of green color in leaf, intensity of green color excluding shoulder (before maturity)in fruit and number of locules in fruit, But Sumurai variety was not distinguished based on qualitative, pseudo qualitative and quantitative traits with compared of Lisa (check) variety. Analysis of variance quantitative traits indicated that evaluated traits such as fruit length and diameter, length to diameter of fruit, pericarp thickness, total diameter of fruit, diameter of core and fruit weight were significantly different at the α=1 % probability level. Also length of leaflets, width of leaflets, width of leaf, diameter of core in cross section in relation to total diameter and peduncle length were significantly different at the α=5 % probability level. These results showed that new varieties had essential uniformity according to standard  of International Union for the Protection Of new Varieties of plants.

In order to investigate the effect of planting date on germination characteristics and biochemical activity of seed in different quinoa genotypes, an experiment was conducted in the Research Laboratory of Seed Physiology and Biotechnology of the Faculty of Agricultural Sciences at University of Guilan in 2019. The experiment was performed as a split plot in the form of a Randomized Complete Block Design in three replications. The seeds of three genotypes T, R and Q29 were planted on six planting dates: 15 January, 15 February, 15 March, 15 February, 15 May and 15 June in the research farm of Karaj Seedling and Seed Breeding Research Institute. The harvested seeds from the treatments available in the field were transferred to the laboratory in order to investigate seed germination characteristics and vigour, and were measured germination percentage and rate, length and weight of the seedling, length and weight index of the seed vigour, electrical conductivity of the seed solution, and biochemical characteristics of soluble protein content, malondialdehyde content, alpha amylase, catalase and peroxidase enzyme activity. The interaction of two factors was significant on germination percentage, germination rate, number of abnormal seedlings, activity of alpha-amylase, catalase, peroxidase and superoxide dismutase enzymes, soluble protein content, malondialdehyde content and electrical conductivity of seed solution. The three planting dates of 15 January, 15 February, 15 March in Q29 genotype showed the highest percentage, germination rate, alpha-amylase enzyme activity and the highest number of abnormal seedlings.