国内69份穇子营养品质与籽粒颜色关系初探

Preliminary Study on the Relationship between Nutritional Quality and Grain Color of 69 Domestic Finger Millet Resources

本研究测定了69份穇子资源的籽粒颜色(明度:L^(*),红度:a^(*),黄度:b^(*))及淀粉和总黄酮含量等12个营养指标,并根据L^(*)、a^(*)和b^(*)值分析各类粒色的营养指标差异及粒色值与营养指标的相关性。结果表明,采用聚类分析将69份穇子资源分为棕黄色、褐色和黑红色3类。黑红色穇子的平均蛋白质、总氨基酸、钙、铁、钾、镁、维生素B2含量均高于其他颜色穇子,其中镁含量与其他2种粒色穇子都存在极显著差异(P<0.01)。由相关性结果可知,钙、镁含量均与L^(*)、b^(*)存在显著负相关(P<0.05),L^(*)和b^(*)越低,钙和镁含量越高。总糖含量与L^(*)值呈极显著负相关(P<0.01),淀粉与b^(*)呈显著负相关(P<0.05),其余均与粒色值相关性不大。

In this study,12 nutritional indexes such as grain color(brightness:L^(*),red:a^(*),yellow:b^(*)),starch and total flavone contents of 69 finger millets resources were determined,and the differences of nutritional indexes of grain color and the correlation between grain color and nutritional indexes were analyzed according to L^(*),a^(*)and b^(*)values.The results showed that the cluster analysis of 69 finger millet resources were separated into three groups:brown-yellow,brownness,and black-red.The average contents of protein,total amino acid,calcium,iron,potassium,magnesium,and VB2 of black red finger millets were higher than those of all other colors,and the magnesium content was significantly different from that of the other two kinds of grain colors(P<0.01).The correlation results exhibited that both calcium and magnesium contents were negatively correlated with L^(*)and b^(*)(P<0.01).The lower the L^(*)and b^(*)values,the higher the content of Ca and Mg.Total glucose was negatively correlated with L^(*)value(P<0.01),total starch content was negatively correlated with b^(*)value(P<0.05),and the rest were not correlated with grain color value.