Effect of salt stress and hydropriming on germination characteristics of Mungbean (Vigna radiata (L.) Wilczek)

Introduction Legumes are the most important source of vegetable protein supply. Mungbean (Vigna radiate (L.) Wilczek) produces seeds contain 22-25 percent protein and high nutritional value for human and also is a major source of protein in most modern societies. Rapid seed germination and emergency, is an important factor determining the ultimate yield of the plant. Salinity is the most important non-life-threatening of plants, especially in the bean. Drought has affect plant growth by reducing water potential in the root zone or create toxicity the sodium and chlorine ions in seedling and or through nutrient imbalance by decrease in absorption rate or a reduction in the transmission rate of the shoots. Nowadays the seed pretreatment technique has introduced as an agent for improvement, seed germination and plant establishment under environmental stress. Seed priming with using pure water is a very simple and cost-effective method that reduce the time required for water absorption in seeds, the mean and percent of germination is improved and expedited emergence and establishment of seedling. Materials & Methods This study was conducted to evaluate the effect of hydropriming on germination component of mung bean under salinity stress, with a factorial experiment using a RBD design with four replications. The hydropriming at 4 levels (0, 8, 16 and 24 hours) and the salinity stress at 5 levels of 0, 2, 4, 6 and 8 dsi/m were used. Before running the test, seeds were washed with a solution of 10% sodium hypochlorite disinfectant for 15 minutes and then 3 times with distilled water.To hydropriming, Seeds were soaked according to levels specified time in distilled water at 25 °Celsius (room temperature). Then 25 seeds were placed within a sterile Petri dish with filter paper. The potential of zero bar was used for distilled water. Five ml of NaCl solution with the potential of 0, 2, 4, 6, 8 ds/m was added to each petri dish. Then petri dishes were coated by parafilm and placed in Germinator at 25 ° Celsius and in the dark for 8 days. The average and percent germination, the radicle and plumule length, fresh weight and dry weight, allometric index, seedling water percent and seed vigor of mung bean were measured. Results & Discussion The results showed that there were significant differences between treatments for all the variables.In addition, the interaction of hydropriming with salinity stress had a highly significant effect on radicle and plumule length, fres