水杨酸对茶树离体叶片衰老的影响

Effects of salicylic acid on senescence in detached leaves of tea plant

为探明水杨酸(SA)对茶树离体叶片衰老的影响,先后分别用0、100、200、300、400、500 mg/L和0、50、100、150、200 mg/L的水杨酸处理茶树离体叶片。结果表明,一定浓度的水杨酸能有效延缓茶树离体叶片的衰老,但质量浓度高于200 mg/L的水杨酸会导致离体叶片出现不同程度的伤害;50、100、150 mg/L处理均能使离体叶片保持正常,且能减缓其衰老过程中SOD活性、叶绿素含量、可溶性蛋白含量的降低和MDA的积累,其中100 mg/L处理的效果最好。

Effects of salicylic acid（SA） on senescence of detached tea plant（Camellia sinensis） leaves were investigated.by two-group experimental design using different concentration gradient separately with solution treatment of SA,one group at 0,100,200,300,400,500 mg/L and another at 0,50,100,150,200 mg/L.Results demonstrated that certain concentration of SA was able to slow down efficiently the senescence process of detached leaves of tea plant,but the detached leaves displayed different degrees of injured phenomenon with concentrations of SA above 200 mg/L.However,the detached leaves were maintained normal and decreases in activity of SOD,contents of chlorophyll,contents of soluble protein,and accumulation of MDA were alleviated by SA at the concentration of 50,100,150 mg/L,among which the 100 mg/L had the best effect.