辣椒苗期低温耐受性评价OA

To evaluate the tolerance of high-quality pepper germplasm resource to low-temperature stress during the seed-ling stage,six pepper materials including 19Y004,19Y012,and Qicunhong were selected 4℃/12 h low-temperature treatment groups and a 25℃/12 h control group were set up.By assessing the cold damage level,measuring relevant physiological and biochemical indicators,and combining principal component analysis,a comprehensive evaluation of low-temperature tolerance was conducted.The results show that there are significant difference in the cold resistance char-acteristics of the six pepper materials.Among them,the cold damage level of 19Y004 was 0 and exhibited normal mor-phology.Principal component analysis showed that Qicunhong had the highest comprehensive score(78.75)and the stron-gest low-temperature resistance,while 19Y012 had the lowest comprehensive score(-57.00)and the poorest cold resis-tance.In conclusion,this study not only identified the difference in low-temperature tolerance among the six pepper germ-plasm resources,but also selected Qicunhong as an excellent cold-tolerant germplasm resource,which can provide a theo-retical basis for the breeding for cold tolerance in pepper.