小麦芽期和苗期耐盐鉴定方法的适用性评价OA北大核心CSTPCD

Salt tolerance identification is the premise of screening germplasm and breeding salt-tolerant wheat varieties.There are many methods for testing salt tolerance of wheat indoor,involving different growth stages and tissues or organs.In order to evalu-ate the applicability of these methods in production,we selected five salt-tolerant varieties and five salt-sensitive varieties from the Northern Winter Wheat Production Area of China to compare seven identification methods(involving 27 parameters)for the responses to salt stress of wheat at germination and seedling stages.The results showed that the relative salt-injury rate for germi-nation of grains could not distinguish the tolerant-and sensitive-varieties,while the salt-injury index of leaf,the Na+ and K+ fluxes of root,and the relative salt-injury rates for root tip number,root diameter as well as leaf K+ content of seedlings were signifi-cantly different between the tolerant-and sensitive-varieties.Based on the results of regressive analysis and operability,the salt-injury index of leaf was considered to be an appropriate method for identifying salt tolerance that with high applicability in the Northern Winter Wheat Production Area,which can be used for germplasm screening or variety breeding by integrating the relative salt-injury rate for root tip number or leaf K+ content,and the Na+ or K+ flux of root.This study analyzed and evaluated the salt tolerance identification methods from the aspect of application,and provide reference information for salt tolerance breeding in wheat.