Varietal responses of soybean germination and seedling elongation to temperature and polyethylene glycol solution
1988
Seong, R.C. | Chung, H.J. (Paichai Univ., Taejon (Korea R.). Dept. of Horticulture) | Hong, E.H. (Rural Development Administration, Suwon (Korea R.). Crops Experiment Station)
Germination and seedling elongation of soybeans [Glycine max. (L.) Merr., cultivars Bangsakong, Hill, Paldalkong, Danyupkong, Baegwun-kong, Kwangkyokong, Changyupkong and Hwangkeumkong] were measured at two temperatures (15 and 30deg C) and four polyethylene glycol 10,000 (PEG) solutions (0, 20, 30 and 35g/100g H2O). Adjustments of PEG solution were based on water potentials of 0.0, -0.5, -1.1 and -1.5 MPa at room temperature. Observations were made at 3, 6, 9 and 12 days for 15deg C and 1, 2, 3 and 4 days for 30deg C. Fifteen seeds of each cultivar were placed on Whatman No. 1 (9cm) filter paper in plastic petridishes, and adjusted to 15 ml of the proper PEG solution supplemented with 0.2 percent thiram using automatic syringe. The dishes were covered with cap. The seeds were germinated at a continuous temperature of 15 or 30 deg C under dark conditions for programmed period. Seedling moisture content and seedling length of eight soybean cultivars decreased as PEG concentration increased both at 15 and 30 deg C. Cultivar differences in seedling moisture content and seedling length were found among eight soybean cultivars at temperatures of 15 and 30 deg C. Larger sized cultivar absorbed more moisture than smaller sized cultivar. However, reverse results were obtained on the seedling moisture content of each of eight soybean cultivars. Cultivar Hill and Paldalkong showed greater seedling length than the other six cultivars from 20 to 30g/100g water of PEG concentrations both at 15 and 30deg C. The results of this study indicated that germination test of soybean seeds in aqueous solutions of PEG has potential for screening soybean cultivars for improved emergence during moisture stress
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