蛭石引发对NaCl单盐胁迫下辣椒种子萌发和幼苗抗氧化特性的影响

Effects of priming treatment with vermiculite on the seed germination and seedlings' antioxidant characteristics of hot pepper under NaCl stress

研究了蛭石引发处理和非蛭石引发处理对‘杭椒六号’在NaCl胁迫下种子发芽特性和幼苗耐盐性的影响。结果表明:在NaCl胁迫下,经过引发处理的种子发芽率、发芽势、发芽指数、活力指数和幼苗干鲜重均显著高于对照。引发处理显著提高了幼苗叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)的活性,超氧阴离子(O2-.)的产生速率以及膜脂过氧化产物丙二醛(MDA)含量显著降低,膜脂过氧化程度较轻;游离脯氨酸、可溶性蛋白质和可溶性糖的含量均显著高于对照。以上结果表明,蛭石引发提高了辣椒种子的活力并增强了幼苗的耐盐性。

The seeds of Capsicum annuum cultivar ‘Hangjiao 6＇ were used as test materials, and the effects of priming treatment with/without vermiculite were studied on the seed germination and the salt tolerance of C. annuum seedlings under NaCI stress. The results showed that after priming treatment of the seeds with vermiculite the germination rate, germination energy, germination index and vigor index of seeds and the fresh and dry weights of seedlings were significantly higher than those of control. The priming treatment with vermiculite singnificantly improved the activities of superoxide dismutase（SOD）and peroxidase（POD）in the leaves of seedlings and significantly decreased the rate of producing superoxide anion（O2^-· ）and the content of malondiadehyde（MDA）, resulting in lower membrane lipid peroxidation and significantly higher contents of free proline, soluble protein and soluble sugar in the seedlings. The above results indicated that priming treatment with vermiculite could improve the vigor of hot pepper seeds and the salt tolerance of hot pepper seedlings.