尿素引发对甜菜种子萌发及生理特性的影响OA

To investigate the effects of urea application on the germination and physiological character-istics of Beta vulgaris seeds,'TD801'Beta vulgaris seeds were used as the material.4 urea concentra-tions(0.3,0.6,0.9,1.2 g/L)and 3 soaking times(8,16,24 hours)were set up for the experiment.The results showed that the treatment combinations at medium and low concentrations(0.3 g/L+24 hours,0.6 g/L+8 hours)could significantly increase the seed vitality level,effectively promote the elongation of embryonic roots,enhance the activities of antioxidant enzymes(SOD,CAT),increase the content of ascorbic acid(AsA)and the ratio of reduced ascorbic acid/oxidized ascorbic acid(AsA/DHA),and reduce the content of malondialdehyde(MDA)and the electrical conductivity of the extract solution.The high concentration(≥0.9 g/L)treatment would inhibit seed germination and aggravate membrane lipid peroxidation.Correlation analysis indicated that the germination indicators were significantly positively correlated with growth indicators,antioxidant capacity and osmotic regu-latory substances,and significantly negatively correlated with membrane damage indicators.This sug-gested that urea-induced regulation of antioxidant,membrane protection and osmotic regulation func-tions could reduce the degree of membrane lipid peroxidation and promote seed germination vitality.