Fruit quality analysis and comprehensive evaluation of 27 avocado variet-ies
摘要
【Objective】The flesh of the avocado is fine in texture and rich in unsaturated fatty acids, flavonoids, phenols and other nutrients, which have health care functions such as preventing arteriosclerosis, stroke and diabetes. Principal component analysis, membership function analysis and clustering analysis were used to comprehensively evaluate the quality traits of 27 avocado varieties preserved in the avocado germplasm resource nursery of Guangxi South Subtropical Agricultural Science Research Institute, to establish a fruit evaluation system, and to determine the difference in fruit quality among the different avocado varieties.【Methods】A comparative analysis of fruit quality indexes, such as the dry matter content, soluble solid content, bioactive substance content and fatty acid composition, were carried out among 27 avocado varieties. Principal component analysis, membership function analysis, and clustering analysis were used to evaluate the fruit quality of different avocado varieties comprehensively.【Results】Significant differences were observed in 13 fruit quality indexes among 27 avocado varieties, with coefficients of variation ranging from 3.73% to 160.07%. Hass was rich in the contents of dry matter, total fatty acid, saturated fatty acid and polyunsaturated fatty acid. The highest soluble solids content, total phenolic content and total flavonoid content were found in Guilong No. 4, Lisa and Guilong No.3, respectively. Lamb Hass had the highest contents of unsaturated fatty acid and monounsaturated fatty acid, while the DPPH free radical scavenging capacity of Tenglong and ABTS free radical scavenging capacity of Guiyan No.3 were the highest compare to other varieties. All samples were clustered based on 13 fruit quality traits, and the 27 avocado varieties were divided into 5 categories. The cluster 1 included Hass, Fuerte and Lamb Hass. The cluster 2 included Guikenda No.2, Guilong No. 15 and Guiyan No. 3. The cluster 3 included Lisa, Guiyan No. 4, Be