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The effects of 6-benzylaminopurine(6-BA) on several physiological indexes of Caryota mitis and C.obtusa seedlings treated at varied temperatures were conducted,the leaves of the two palm species were sprayed with 0,25,50 and 100 mg · L~(-1)6-BA solutions,the activities of superoxide dismutase(SOD),peroxidase(POD),and the contents of malondialdehyde(MDA),proline,soluble protein,chlorophyll and chlorophyll a/b were determined under 25℃,5℃ and 25℃ for 24 h,respectively.The dynamics of a series of important physiological components derived from the leaves were studied.It was indicated that all the above mentioned physiological indexes varied with different concentrations of 6-BA and temperature.The fuzzy comprehensive evaluation values for different concentrations of 6-BA at the recovery temperature 25℃ were 0.33,0.28,0.92 and 0.33,respectively for C.mitis,and 0.20,0.49,0.56 and 0.63,respectively for C.obtusa.It was concluded that leaves sprayed with different concentrations of 6-BA could affect the cold tolerance of palm seedlings.The optimal concentration of 6-BA was different for different palm species.
The effects of 6-benzylaminopurine (6-BA) on several physiological indexes of Caryota mitis and C. obtusa seedlings treated at various temperatures were conducted, the leaves of the two palm species were sprayed with 0,25,50 and 100 mg · L The activities of superoxide dismutase (SOD), peroxidase (POD), and the contents of malondialdehyde (MDA), proline, soluble protein, chlorophyll and chlorophyll a / b were determined under 25 ℃, 5 ° C and 25 ° C for 24 h, respectively. The dynamics of a series of important physiological components derived from the leaves were studied. It was indicated that all the above profiles were varied with different concentrations of 6-BA and temperature. Fuzzy comprehensive evaluation values for different concentrations of 6-BA at the recovery temperature of 25 ° C. were 0.33, 0.28, 0.92 and 0.33, respectively for C. mitis, and 0.20, 0.49, 0.56 and 0.63, respectively for C. obtusa. leaves sprayed with different concentrations of 6- BA could affect the cold tolerance of palm seedlings.The optimal concentration of 6-BA was different for different palm species.