نشریه تحقیقات بذر
پیاپی 38 (بهار 1400)

Decreased vegetative growth is one of the consequences of seed decay that may reduce plant yield. In order to investigate the effect of seed decay on germination and seedling growth of wheat cultivars in laboratory conditions, an experiment was conducted in a completely randomized design with three replications in 2010 in the laboratory of the Faculty of Agriculture, Islamic Azad University, Gorgan Branch. The treatments studied in this test included three levels of burnout (control, 72 and 96 hours). They were incubated for 45 and 96 hours at 45 ° C and 100% relative humidity to induce deterioration. The results showed that germination percentage and germination rate were significant under different treatments of seed degradation at a probability level of 1% and shoot dry weight, root dry weight, seedling dry weight, shoot length and root length at a probability level of 5% were significant. With increasing seed decay period, germination percentage, germination rate, shoot dry weight, root dry weight, shoot length and root length decreased compared to the control, so that the highest percentage and germination rate were obtained in the control and the lowest in 96 hours of decay treatment. With increasing the rate of burnout in all traits showed a downward trend.

Medicinal plants are widely used in traditional and modern industrial medicine. For this purpose, the effect of salicylic acid pre-treatment on germination and some seed characteristics of borage (Borago officinalis L.), under salinity stress carried out as factorial in a randomized complete blocks design with three levels of salicylic acid (500, 1000 and 1500 mM) and salinity stress (50, 100 and 150 mM). Measured traits included root and stem length, seed germination energy, seed vigor, proline content in root and stem, germination rate and final germination percentage. According to the results, the effect of salicylic acid under salinity stress showed significant effect on studied traits. Increased salinity caused decrease in seed and germination indices. In general, application of salicylic acid as a seed pre-treatment improved growth and germination.

In order to evaluate the effect of priming and salinity stress on seed germination of sesame (Sesamum indica L.), a factorial experiment was conducted as completely randomized design with three replications at Seed Technology Laboratory of College of Agriculture, Shahed University in 2016. The factors were pre-treatment of cytokinin (0.2 and 0.5 mg/L), auxin (0.2 and 0.5 mg/L) and salinity stress (zero, -3, -6, -9 and 12 dS.m-1 ). Analysis of variance showed that the effect of priming on total germination percentage, seedling dry weight and SV II index was significant at 1% probability level, but on relative moisture content was not significant. Also, salinity stress on all traits were significant. The highest total germination percentage (20%) related to control and the lowest one was in -12 ds.m-1 salinity and 0.5 mg/L (14.5) cytokinin. However, there was no different with control under -9 ds.m-1 salinity stress. The highest and the lowest SV II index related to the 0.5 mg/L auxin in no salinity (11.90) and 0.5 mg/L auxin with 12 ds.m-1 salinity (1.190), respectively. In general, application of auxin improved germination percentage and rate of sesame seeds under salinity stress condition up to 6 dS.m -1 .

Coriander is one of the most important medicinal plants used both fresh and dried and has many medicinal properties. One of the great biological resources is seaweed, which is full of materials needed for plant growth. Therefore this experiment was performed to investigate the effect of priming with seaweed extract on germination and growth of coriander seedlings (Coriandrum sativum L.) at different times. Factorial experiment was conducted in a completely randomized design with four replications in the Laboratory of Faculty of Agriculture, University of Birjand, in 2020. The experimental factors were priming time at two levels (12 and 24 hours) and the concentration of seaweed extract at 6 levels (1,2,3,4 ml per liters and distilled water and dry seed treatment). Results showed that algae extract priming, significantly increased germination rate and percentage. In general, priming of coriander seeds in 12 hours with 2 ml of seaweed extract improved germination and seedling characteristics of coriander

The sea squill (Drimia maritima L.) is a perennial bulbous plant used in traditional medicine. This plant grows in the southern parts of Iran, but there is no information about the propagation of this plant using seeds. In the present experiment, the effects of soil, pumice, soil/pumice, coco peat, coco peat/perlite, fine perlite, coarse perlite, sand, fine sand and compost of sugarcane waste on seed germination and some seedling growth indices were investigated. The results showed that seed germination percentage, germination index, Thomson germination index, germination index rate and seed germination rate in soil, sand and soil/pumice were lower than other seed bed. Minimum length of roots and aerial parts was in the soil culture. The highest fresh and dry weight of roots, shoots and total dry weight of seedlings as well as shoot growth index were observed in soil/pumice growing media. In general, seed bed had significant effect on seed germination percentage and germination indices as well as seedling growth indices. To propagate the sea squill by seed, it is recommended to use soilless culture.

Salinity is one of the main abiotic stress limits plant growth and production by changing ionic and osmotic balance. This study was conducted to investigate the effect of osmotic pretreatment on germination indices of celery seeds under salinity stress as a factorial experiment in a completely randomized design with three replications. Osmotic pre-treatment factors were: osmotic solution (1%) of KNo3, KCl, CaCl2 and CaSO4 and control (without pre-treatment) and salinity factor at four levels including concentrations of 0, 50, 100 and 150 mmol NaCl. Seed germination rate, seed germination percentage, radicle and plumule length, radicle and plumule dry weight, Kutowski-coefficient, salinity tolerance index, allometric coefficient and seed vigor index were measured. Results showed that under normal conditions, osmotic pretreatment had no positive effect on germination percentage and germination rate. Germination indices significantly decreased with increasing salinity stress, so that no germination observed in the 150 mM salinity treatment. The positive effect of osmotic pre-treatments on seed germination indices was significant. In non-stress conditions, calcium chloride treatment increased salinity resistance by 100% and in 50 mM stress by 150%, but at 100 mM salinity, potassium nitrate had a better effect than other treatments. There was a positive and significant correlation between all germination indices. In general, under salinity stress pretreatment of celery seeds can be used as a beneficial solution.

Salinity is one of the main abiotic stress limits plant growth and production by changing ionic and osmotic balance. This study was conducted to investigate the effect of osmotic pretreatment on germination indices of celery seeds under salinity stress as a factorial experiment in a completely randomized design with three replications. Osmotic pre-treatment factors were: osmotic solution (1%) of KNo3, KCl, CaCl2 and CaSO4 and control (without pre-treatment) and salinity factor at four levels including concentrations of 0, 50, 100 and 150 mmol NaCl. Seed germination rate, seed germination percentage, radicle and plumule length, radicle and plumule dry weight, Kutowski-coefficient, salinity tolerance index, allometric coefficient and seed vigor index were measured. Results showed that under normal conditions, osmotic pretreatment had no positive effect on germination percentage and germination rate. Germination indices significantly decreased with increasing salinity stress, so that no germination observed in the 150 mM salinity treatment. The positive effect of osmotic pre-treatments on seed germination indices was significant. In non-stress conditions, calcium chloride treatment increased salinity resistance by 100% and in 50 mM stress by 150%, but at 100 mM salinity, potassium nitrate had a better effect than other treatments. There was a positive and significant correlation between all germination indices. In general, under salinity stress pretreatment of celery seeds can be used as a beneficial solution