耐盐西瓜砧木筛选及其耐盐机理的研究

通过NaCl处理筛选出了适合保护地栽培的耐盐西瓜砧木,并对其耐盐机理进行了研究。结果表明,三丰付子瓜、北京极早冬瓜等砧木最耐盐,可耐受300mmol/L的浓度,韩育瓠子瓜等品种不耐盐;高盐胁迫下,细胞膜结构破坏,质膜透性增加,相对电导率均大幅度提高;细胞的膜脂过氧化程度明显加剧,丙二醛(MDA)含量显著增加;植物体内过氧化物酶(POD)活性增强,超氧化物歧化酶(SOD)活性下降;同时,盐处理后植物体内游离脯氨酸含量增加,无盐及盐胁迫下,耐盐品种均高于盐敏感品种。

Study on the Screening of Salt-tolerant Watermelon Stock and Mechanism of Salt-tolerance

Salt-tolerant watermelon stock suit for greenhouse culture was successfully isolated through NaCl stress, and the mechanism of salt-tolerance of stock was studied. The results showed that the salt tolerant of sanfeng guard and Beijing very earlierness was guard were the best, and their ultimate salt tolerant concentration was 300 mmol/L, but hanyu guard was on the contrary. Under the high salt stress,the structure of membrance was destroyed,permeability of cytoplasm membrance was enhanced,electrolytic leakage was increased rapidly;membrance lipid peroxidation was hasten,and content of MDA was dramatically increased,POD activities raised and SOD activities declined.At the same time,content of proline was approved.