不同生态区黔椒8号果实品质差异及其综合评价OA

[Objective]The difference in pepper quality characteristics of Qianjiao 8 from different ecological regions was investigated to determine the key indexes of differential markers,and provide a theoretical basis for production of high-quality pepper.[Method]The standardized multi-site field experiment was designed and the nutritional components and volatile compounds of Qianjiao 8 planted in 5 different ecological regions,including Zunyi of Guizhou(GZ),Zhengzhou of Henan(HZ),Changsha of Hunan(HC),Urumqi of Xinjiang(XW)and Chifeng of Inner Mongolia(NC)were detected by physicochemical analysis and HS-SPME-GC/MS.The detection results were analyzed by principal component analysis(PCA)and orthogonal partial least squares discriminant method(OPLS-DA),and the comprehensive quality of peppers was evaluated by using the TOPSIS method.[Result]There were significant differences in physicochemical indexes of Qianjiao 8 peppers planted in 5 different ecological regions.The content of reducing sugar,total amino acids and capsanthin in Qianjiao 8 peppers from HZ reached 3.28 mg/g,23.04 mg/g and 67.84 mg/g,respectively.The content of capsaicin(1.40 mg/g)and dihydrocapsaicin(0.54 mg/g)in Qianjiao 8 peppers from NC was significantly higher than that from 4 other ecological regions.There were 127 volatile compounds in Qianjiao 8 peppers among 5 ecological regions.A total of 86 kinds of volatile compounds were detected from Qianjiao 8 peppers from GZ,the content of volatile compounds reached 142.46 μg/g(the highest)and the esters(68.18 μg/g,47.86%)were its characteristic components.There were the commonality and regional specificity in volatile compounds composition of Qianjiao 8 peppers among 5 different ecological regions.The esters(VIP=2.09)and capsanthin(VIP=1.89)screened by multivariate statistical analysis were key differential markers.The esters was negatively related to diurnal temperature range during the growing period significantly.From the perspective of comprehensive quality,the quality of Qianjiao 8 peppers from GZ was the best,followed by HZ.[Conclusion]The quality of Qianjiao 8 peppers is significantly influenced by the cultivation ecological environments.The esters and capsanthin can be used as geographical origin indicators.