南瓜品种资源中铬含量聚类分析

南瓜中含有的营养成分对多种疾病的防治有着不可忽视的作用。其中南瓜中的果胶、环丙基氨基酸以及微量元素锌、铬（Cr）对防治糖尿病起主要作用。但长期以来，由于人们对南瓜的营养价值认识不够，除部分食用外，还有一部分作为饲料处理，导致南瓜品种资源不能充分利用。本文采用干法消解处理样品，原子吸收光谱仪测定200份不同品种资源南瓜中铬的含量。其中203号样品总铬含量最低（0.015 3 mg/kg），233号样品总铬含量最高（0.520 0 mg/kg），且已超出国家限量标准（≤0.5 mg/kg）。通过对试验数据进行聚类分析，从200份不同南瓜品种资源中筛选出一批含铬量适宜的品种，为开展富铬南瓜新品种的选育奠定技术和种质基础，对利用南瓜防治糖尿病也有重要意义。 

Cluster Analysis of Chromium Content among Pumpkin Resources

Nutrients contained in pumpkin have a negligible effect for prevention and treatment of human diseases.Pectin，cyclopropyl amino acids and trace elements zinc and chromium contained in pumpkin play a major role in the prevention of diabetes.For a long time，as people lack of awareness of the nutritional value of pumpkin，only part amount of pumpkin were eaten，and part of pumpkin were used as feed，as well as causing insufficier usage of pumpkin resources.In this paper，the contents of Cr in 200 pumpkin resources were determined by dry ashing-atomic absorption spectrometry.Sample number 203 has the lowest chromium content 0.015 3 mg/kg.Sample number 233 has the highest chromium content 0.520 0 mg/kg，which has exceeded the national limited standard（≤0.5 mg/kg）.200 germplasm materials were cluster analyzed，in which were screened out varieties with suitable content chromium offer technology and germplasm basis for breeding new varieties in rich-chromium pumpkin.