不同浓度海藻肥对甜叶菊苗期抗逆性的影响

Effects of Different Concentrations of Seaweed Fertilizer on Stress Resistance of Stevia at Seedling Stage

为研究不同浓度海藻肥对甜叶菊抗逆性的影响,本文采用盆栽试验,以甜叶菊为材料,共设置7个海藻肥浓度(0、1.00、1.25、1.50、2.00、2.50、3.00 g/L),以不施用海藻肥为对照。施肥后10、20、30 d测定甜叶菊苗期的生长量(株高、茎粗、地上部鲜质量及干质量)、抗氧化体系(超氧化物歧化酶活性、抗坏血酸含量)、渗透调节物质(脯氨酸、可溶性糖含量)、过氧化物(丙二醛)和叶绿素(叶绿素a、叶绿素b、叶绿素a+b)含量等。结果表明:与普通复合肥相比,配施1.50 g/L海藻肥可提高甜叶菊的地上部干质量4.17%~37.50%,使可溶性糖含量显著提高36.61%~58.91%;配施2.00 g/L海藻肥可使超氧化物歧化酶含量和抗坏血酸含量分别显著提高23.56%~97.56%、71.97%~109.19%,脯氨酸含量显著提高51.53%~81.48%,丙二醛含量显著降低35.87%~40.39%。

To study the effects of different concentrations of seaweed fertilizer on seedling growth,stress resistance and nutrient content of stevia,a pot experiment was conducted with stevia as the material,and 7 seaweed fertilizer concentrations(0,1.00,1.25,1.50,2.00,2.50,3.00 g/L)were set,and no seaweed fertilizer was used as the control.The growth(plant height,stem diameter,fresh weight and dry weight of shoot),antioxidant system(superoxide dismutase activity,ascorbic acid content),osmotic regulating substances(proline,soluble sugar content),peroxides(malondialdehyde)and chlorophyll(chlorophyll a,chlorophyll b,chlorophyll a+b)content in the seedling stage were measured 10,20 d and 30 d after fertilization.The results showed that compared with the common compound fertilizer,the combined application of 1.50 g/L seaweed fertilizer could significantly increase the shoot dry weight of stevia by 4.17%-37.50%,soluble sugar content by 36.61%-58.91%.When 2.00 g/L algae fertilizer was applied,the content of superoxide dismutase and ascorbic acid were significantly increased by 23.56%-97.56%and 71.97%-109.19%,respectively,proline content was significantly increased by 51.53%-81.48%,and the content of malondialdehyde decreased by 35.87%-40.39%.