Dataset on the extensibility of pounded yam from different yam genotypes (by KDGE) in Côte d'Ivoire

The CNRA yam genetic resources collection contains a diversity of accessions consisting of traditional, introduced and hybrid varieties. This collection was the subject of characterization of the quality of pounded yam (foutou) in order to identify varieties suitable for making pounded yam. The sensory parameters measured are the extensogram peak force (N), extensibility (mm), extension area (k.mm). The results show that the measured parameters are positively and strongly correlated. Among these parameters, the extension area (k.mm) best discriminates the two species and extensibility the genotypes. PCA coupled with ascending hierarchical classification (ACH) made it possible to screen the varieties into three classes taking into account their extensibility, that is to say their ability to make pounded yam that pulls. Class 1 consists of 10 varieties with high extensibility. The varieties in this class, all of the species D. rotundata, are capable of making good pounded yam and can therefore be selected. Class 2 includes 21 varieties with medium extensibility. The varieties in this class, which include both D. rotundata and D. alata varieties, can make foutou of medium quality. Class 3 includes varieties of D. rotundata, and most of the varieties of D. alata have low extensibility and cannot produce good quality pounded yam (foutou).

CNRA山药遗传资源库包含涵盖传统品种、引进品种与杂交品种在内的多样种质资源。该资源库曾针对捣制山药泥（foutou）的品质开展性状表征研究，以筛选适配该料理制作的山药品种。本次测定的感官参数包括拉伸仪峰值力（单位：牛，N）、延展性（单位：毫米，mm）及拉伸面积（单位：千牛·毫米，k.mm）。研究结果显示，上述测定参数间呈显著正相关。其中，拉伸面积（k.mm）可最佳区分两个供试山药物种，而延展性则可有效区分不同基因型。结合主成分分析（PCA）与升序层次分类（ascending hierarchical classification, ACH），研究人员可依据山药的延展性——即其制作可拉伸捣制山药泥的能力——将供试品种划分为三类：第一类包含10个高延展性品种，该类品种均为圆叶薯蓣（D. rotundata），均可制作出品质优良的捣制山药泥，因此可作为优选品种。第二类包含21个中延展性品种，该类涵盖圆叶薯蓣（D. rotundata）与大薯（D. alata）两类物种，其制作的捣制山药泥品质中等。第三类包含圆叶薯蓣品种，且多数大薯（D. alata）品种延展性较低，无法制作出高品质的捣制山药泥（foutou）。