水杨酸对冷胁迫下香蕉幼苗抗冷性的效应

Effect of Salicylic Acid on Banana Seedlings under Chilling Stress

用0.6 mmol/L水杨酸(SA)喷洒香蕉幼苗叶片1 d后,于8℃低温胁迫5 d,研究水杨酸对香蕉幼苗抗冷性的影响。结果表明:SA降低了受低温胁迫的香蕉幼苗叶片相对电导率及丙二醛(MDA)和过氧化氢含量,减缓了可溶性蛋白质含量的下降,提高了脯氨酸含量及过氧化物酶(POD)、过氧化氢酶(CAT)活性。表明SA可通过提高香蕉幼苗抗氧化酶活性、清除活性氧的积累、减少膜损伤来缓解低温对香蕉幼苗的损伤。

Bananas seedling leaves were sprayed by 0.6 mmol/L salicylic acid （SA）, then in cold storage at 8 ℃ for 5 d. The effects of SA on resistance of banana seedling to chilling injury were studied. The results showed that pretreatment with 0.6mmol/L SA reduced the contents of MDA and hydrogen peroxide, and the relative ratio of electrolyte, retarded the decreasing of soluble protein, increased the content of proline and the activities of POD and CAT in banana seedling leaves. It indicated that SA could increase the cold tolerance of banana seedling, which was mainly achieved by means of enhancing the anti-oxidative enzyme activities, inhibiting the accumulation of reactive oxygen and decreasing the injury of membranes under cold stress.