外源锌对气生铁兰抗寒生理特征的影响OA

To explore the effect of exogenous zinc on physiological characteristics of cold resistance in Tillandsia under natural low tempera-ture,this study is based on six species of Tillandsia as experimental material with seven zinc treatments,respectively 0,100,150,200,250,300,350 mg/L.The results showed that with the increase of zinc concentration,the changes of chlorophyll content(Chl),proline content(Pro),activity of antioxidant enzymes(SOD and POD)all increased first and then decreased,the membrane lipid peroxidation index(MDA and REC)was opposite;when the concentration of zinc was 200-300 mg/L,the membrane peroxidation was reduced,the antioxidation ability of the cells was enhanced,the osmotic pressure was stable,the photosynthetic physiological state was good,the plant grew healthily,the dam-age caused by low temperature stress was also obviously weakened,and the cold resistance was significantly improved,such as the content of Chl,Pro and antioxidant enzyme activity were higher,the content of MDA and REC were lower.