Principal Component Analysis of the Classification of Yacon Cultivation Areas in Korea

Abstract

To establish cultivation areas for the stable production of yacon, this study investigated the productivity and functional component contents of yacon in eight regions of Korea from 2011 to 2013. The results of principal component analysis using these data were as follows. A survey of 16 agricultural traits and meteorological data in the eight yacon cultivation areas showed that five factors (average temperature, maximum temperature, minimum temperature, frost-free days, and fructooligosaccharide content) were highly significant at the p < 0.001 level. Among the 16 agricultural traits and meteorological data used in the main component analysis of yacon cultivation areas, approximately eight contributed to the first principal component, and approximately four contributed to each of the second and third principal components. In particular, factors related to productivity, fructooligosaccharide content, and temperature change were considered important criteria for the classification of cultivation areas. The cultivation areas were divided into three groups by principal component analysis. In Group I, containing the Jinbu and Bonghwa areas in the mid-highland region at 500-560 m above sea level, the product yield was the highest at 2,622-3,196 kg/10a, the fructooligosaccharide content was also the highest at 9.04-9.62%, and the mean temperature was 17.3-18.5℃. In Group II, the areas Suncheon, Okcheon, Yeoju, and Gangneung, at 20-180 m above sea level, had the lowest yield, relatively lower fructooligosaccharide content, and the highest temperature. The areas in Group III showed values intermediate between those of Group I and Group II. For the different yacon cultivation areas, the product quantity and fructooligosaccharide content differed according to the environmental temperature, and the temperature conditions and number of frost-free days are considered important indicators for cultivation sites. Therefore, in terms of producing yacon with high quality, cultivation at 500-560 m is considered to give a higher yield and functional fructooligosaccharide content.

Comparison of Quality, Antioxidant Capacity, and Anti-Inflammatory Activity of Adlay [Coix lacryma-jobi L. var. ma-yuen (Rom. Caill.) Stapf.] Sprout at Several Harvest Time

“…Stevia ( Stevia rebaudiana Bertoni) a perennial herb from the Asteraceae family, contains stevioside in its stems and leaves, which is a natural sweetener that is 200 to 300 times sweeter than sugar [ 37 , 38 ]. Similarly, studies have been conducted on the functional properties of fructo-oligosaccharides, a natural sugar component found in yacon, known for its potential health benefits [ 39 , 40 , 41 ].…”

Adaptability, stability, and productivity of potato breeding clones and cultivars at high latitudes in Europe

“…Likewise, the AMMI modeling facilitates delineating mega-environments and improves trial accuracy. AMMI has been used for analyzing multi-environment potato yield trials in Brazil (Queiroz de Souza 2007), Croatia (Mijić et al 2019), Ethiopia (Worku et al 2018, Fufa andFufa 2021), Iran Azimi 2010, Mohammadnia et al 2021), Kenya (Naawe 2020), Korea (Kim et al 2017), Rwanda (Placide et al 2022, and Uganda (Mulema et al 2008). Its modeling, particularly when using the ensuing biplots, led to identifying breeding clones for further cultivar registration and suitable cultivar for respective sites in the target population of environments.…”