34份芦笋品种(系)萌发期耐高温性评价及评价指标筛选OA

In order to comprehensively evaluate the high temperature resistance and screening evaluation indexes of different asparagus varieties(lines),35℃was used as the high temperature stress temperature,and 34 asparagus varieties(lines)were used as experimental materials.The germination potential,germination rate,germination index,fresh weight,root length,bud length and other related traits of different asparagus varieties(lines)were measured at germination stage,and comprehensive evaluation was carried out by principal component analysis,membership function analysis,cluster analysis and stepwise regression analysis.The results showed that 34 asparagus varieties(lines)could be divided into 4 groups by cluster analysis.The group Ⅰ was high temperature resistance,which included 5 varieties(lines);the group Ⅱ contained 12 varieties(lines)with more high temperature resistance;the group Ⅲ was intermediate that contained 5 varieties(lines);the group Ⅳ contained 12 varieties(lines)with high temperature sensitive.The stepwise regression analysis showed that relative germination potential,relative root length and relative germination rate could be used as the positive index of high temperature identification at germination stage of asparagus,and the greater the index value,the stronger the high temperature resistance.C28 was selected as the most resistant line,which could be used as an important resource for high temperature resistance breeding and mechanism research of high temperature resistance of asparagus.