不同品种木薯的主要品质特征与综合评价

为了研究木薯品种间的品质差异,为木薯的品质改良、加工利用提供理论依据,以木薯中2个不良指标(氢氰酸、单宁)和7个优良指标(淀粉、蛋白质、L(+)-抗坏血酸、粗脂肪、粗纤维、总碳水化合物、可溶性糖)为评判指标,采用描述性统计、主成分、平均隶属函数和聚类分析方法对木薯的品质进行了分析。结果表明,不同品种木薯的品质特性差异较大;经主成分的评价模型综合得分可知,木薯的优良指标得分排名前二的品种是GR891、GR4;经平均隶属函数值的排名可知,木薯优良指标和综合指标的平均隶属函数值排名前二的品种均是GR891、GR4;采用聚类分析可将13个品种木薯分为4类,第1类是SC5、SC11、SC124、SC201、SC205、GR3、GR911,第2类是SC8、SC9、GR4、新选048,第3类是ZM8229,第4类是GR891。采用主成分分析、平均隶属函数与聚类分析对木薯品质的综合评价结果基本一致,SC891、GR4在13个品种木薯中品质较好,该研究可为木薯品种的选育和加工应用提供理论支持。

Main Quality Characteristics and Comprehensive Evaluation of Different Varieties of Cassava

To investigate the quality of different cassava varieties and provide theoretical basis for processing,utilization and quality improvement of cassava,two bad indexes(hydrogen cyanide,tannin)and seven excellent indexes(starch,protein,L(+)-ascorbic acid,crude fat,crude fiber,total carbohydrate and soluble sugar)of cassava were analyzed through principal component analysis(PCA),mean subordinate function(MSF)and hierarchical cluster analysis(HCA),respectively. The results showed that the quality characteristics of cassavas were obvious different. According to PCA analysis,the top two varieties of excellent indexes scores of cassavas were GR891 and GR4.According to MSF,the top two varieties of excellent indexes scores and composite scores of cassavas also were GR891 and GR4.13 varieties of cassava were divided into 4 categories by HCA,the first category was SC5,SC11,SC124,SC201,SC205,GR3,GR911,the second category were SC8,SC9,GR4,the new selection 048,the third category was ZM8229,and the fourth category was GR891.The results of comprehensive evaluation of cassava quality by PCA,MSF and HCA were basically same. The quality of SC891 and GR4 were better among the 13 varieties of cassavas. This study provided theoretical support for the selection and processing of cassava varieties.