عنوان مقاله [English]
Background and objectives: Ellagic acid is a natural polyphenol compound, and different concentrations and ways of using it cause different reactions in plants. This research was conducted to investigate the effect of ellagic acid and seed quality on the phenological stages and yield of soybeans.
Materials and methods: The factorial experiment was designed and implemented in a randomized complete block design in three replications in the agricultural years of 2019 and 2020 in the research farm of the Faculty of Agriculture, Shahrood University of Technology. In this experiment, the initial quality of the seed was considered in two levels (normal seed and aged seed) and ellagic acid in four levels (zero, priming, foliar spraying and combined application of priming and foliar spraying with a concentration of 50 mg/liter). Accelerated aging test was used to apply aging and for this purpose, the seeds were kept for 72 hours at a temperature of 41°C and a relative humidity of 95%. Seed priming was done with a concentration of 50 mg/liter of ellagic acid, following the principles of seed aeration for six hours. The spraying treatment was done early in the morning and at the beginning of flowering (R1) and in favorable environmental conditions.
Results: The results showed that accelerated aging in the first and second year of the experiment, respectively, caused a decrease in the final emergence percentage of seedling in the field by 30.93 and 29.93% compared to the control. In the first and second year, the normal seed priming test with ellagic acid increased the final emergence percentage of field by 16.33 and 12.67 percent, respectively. The final emergence percentage of the field in the first and second year of the experiment in aged seeds that were primed with ellagic acid was improved by 14.33 and 8.33%, respectively, compared to the control. Accelerated aging caused a significant decrease in germination rate by 37.66% compared to the control. The final emergemce percentage of seeds that were primed with ellagic acid increased by 18.75% compared to the non-application of this substance. In this experiment, accelerated aging caused a delay in the occurrence of phenological traits in soybean plants. The use of ellagic acid as priming and the combined use of priming and spraying could increase the rate of occurrence of phenological traits to a significant level. Applying accelerated aging in the first and second year of the experiment caused a decrease of 25.85 and 28.78 percent of seed yield, respectively. The use of ellagic acid in the form of priming, foliar spraying and the combined use of priming and foliar spraying increased the seed yield by 23.59, 23.23 and 55.48%, respectively, compared to the control.
Conclusion: The use of ellagic acid as priming and the combination of priming and spraying can be suggested to accelerate the occurrence of phenological traits in soybeans. In this study, the application of ellagic acid as priming worked better than foliar spraying. It is recommended to use priming and ellagic acid solution to improve soybean yield under normal and aging conditions.