不同浓度亚硒酸钠对水培生菜富硒品质的影响

摘要

With Italian lettuce (Lactuca ativa L. var. ramosa Hort.), the effect of nutrient solutions supplemented with 0.25, 0.5, 1.0 and 2.0 mg/L different concentrations of sodium selenite on the selenium enriched effect of lettuce in hydroponics was studied. The results showed that supplying sodium selenite to the nutrient solutions with the final concentration of 0.5 mg/L significantly increased contents of organic selenium 10 times of the control, the plant height by 25.9%, vitamin C content by 20.4% and total phenolics by 29.5% compared with the control in lettuce leaves. There was no significant effect on the single plant weight, content of chlorophyll, protein and cellulose. Supplying sodium selenite with the final concentration of 2.0 mg/L significantly inhibited the plant growth by 48%, but increasing the total phenol sharply by 215.2% compared with the control in lettuce leaves.%以意大利生菜(Lactuca ativa L. var. ramosa Hort.)为材料,通过在水培营养液中添加浓度为0.25、0.5、1.0、2.0 mg/L的亚硒酸钠,研究不同浓度亚硒酸钠对生菜富硒的效果及对生菜生长和品质的影响.结果表明:与对照相比,适宜浓度的亚硒酸钠(0.5 mg/L)培养可大大提高生菜的有机硒含量(9.2 μg/g,DW,10倍于对照),并分别显著提高生菜的株高(增长25.9%)、维生素C含量(增加20.4%)和总酚含量(增加29.5%),但对单株重量和叶绿素、蛋白质、纤维素含量等均无显著影响;而过高浓度的亚硒酸钠(2.0 mg/L)则显著抑制了生菜的生长(鲜重减少48%),但大大增加了总酚含量(增加215.2%).