低温胁迫下不同花椒品种的生理响应及其抗寒性评价OA北大核心CSTPCD

In order to select Zanthoxylum bungeanum varieties that are suitable for local cultivation and have strong cold resistance,this experiment was conducted using five Z.bungeanum varieties,namely'Gou-jiao','Shizitou','Longnan Dahongpao','Taian 1'and'Hanyuan Qingjiao'as experimental materials.Six temperatures of 0,-5,-10,-15,-20,-25℃were set to study the change of physiological and biochemi-cal indicators in the branches and leaves of each Z.bungeanum variety under different low temperature stres-ses,and the membership function method was used to evaluate the cold resistance of each Z.bungeanum vari-ety.The results showed that,with the continuous decrease of temperature,the relative conductivity and proline(Pro)content in branches of the five Z.bungeanum varieties showed the straight upward trend;the activities of peroxidase(POD)and superoxide dismutase(SOD),and the contents of soluble protein and soluble sugar showed the trend of first increasing and then decreasing;the malondialdehyde(MDA)content showed a"S"shaped change trend,while the content of leaf chlorophyll showed a straight downward trend.The comprehen-sive analysis and evaluation result on physiological and biochemical responses of the five Z.bungeanum varie-ties under low temperature treatments by membership function method showed that cold resistances of the five Z.bungeanum varieties were'Longnan Dahongpao'＞'Hanyuan Qingjiao'＞'Shizitou'＞'Taian 1'＞'Gou-jiao'.