核桃主要经济性状的主成分分析及优良品种选择的研究

The studies of principal component analysis on the main economic character and superior variety selection of walnut

应用主成分分析法 ,由样本相关矩阵出发 ,对 15个晚熟核桃品系的 8个主要经济性状 (坚果横径、平均坚果重、坚果壳厚、坚果出仁率、核仁重、核仁脂肪含量、蛋白质含量、每平方米树冠投影面积产果量 )进行分析 ,以性状的累积方差贡献率达到 86 .2 9%确定了 4个反映核桃主要经济性状的主成分及其主成分的函数式 ,并通过计算品系的重要主成分值 ,对供试品系进行比较 ,进而选择综合经济性状优良的品系 ,其结果与品系的实际表现型相近似。表明用主成分分析法对核桃主要经济性状综合评选 ,比采用优良性状打分评优法科学、简便。为核桃优良性状选种提供理论依据。

Based on specimen correlation matrix, the main eco nomic character of 1 5 last varieties of walnut were determined by pincipal component analysis, which included nut width, average nut weight, nut shell thickness, nut kernel percent age, per kernel weight, total fat content of kernel, total protein content and kernel yield per m2 tree-crown projection area. According to more than 86.29% of the cumulative variance proportion, the results proposed four principal compone nts and its function equations which reflected the main economic characters of walnut. The key principal component values of various varieties were calculated, it will be applied to selecting fine varieties, the results were similar to pra ctical phenotype. The method of principal component analysis was more scientific and simple than the method of quiver a mark of main economic characters while e valuating main economic characters of walnut comprehensively, It will provide a theoretical basis for selecting fine varieties of walnut.