不同栽培地不同品种甜荞膳食纤维含量变异研究

以8个甜荞品种在全国19个不同地点进行栽培试验,采用酶重量法测定所得种子中膳食纤维含量,分析在不同地点栽培下不同甜荞品种的籽粒膳食纤维变异情况和不同品种对基本生态因子的敏感性.结果表明,供试甜荞籽粒的总膳食纤维含量(TDF)、非水溶性膳食纤维含量(NSDF)、水溶性膳食纤维含量(WSDF)平均分别为19.65％、14.94％、4.71％,变异范围分别为13.91％～28.32％、8.76％～23.34％、0.63％～9.72％.TDF含量在品种间及地点间差异均达极显著水平;NSDF含量地点间有极显著差异,而品种间无显著差异;WSDF含量在品种间有极显著差异,而地点间差异不显著.Scott-Knott聚类分析显示TDF上供试品种可分为3类和参试地点可分为4类;NSDF上,地点可分为4类;在WSDF上,供试品种可分为3类.相关性分析表明,各甜养品种膳食纤维含量与海拔、生育期均温无显著的相关关系;而榆荞4号的TDF(r=0.637**)和NSDF(r=0.651**)含量与纬度的相关性均达极显著水平,榆荞4号较其他7个品种对纬度敏感性强.

Variation of seed dietary fiber contents among different common buckwheat varieties and among different places

Eight common buckwheat varieties were planted at 19 different locations across the country, and then their kernel dietary fiber content were determined with enzymatic-gravimetric method, so as to analyse the variations of common buckwheat dietary fiber contents among different varieties and among different places and analyze their sensitivity to basic ecological factors. The results showed that the variation ranges of total dietary fiber (TDF) content, non-water-soluble dietary fiber (NSDF) content, and water-soluble dietary fiber(WSDF) content in the experimental common buckwheat kernels are 13.91%~28.32%,8.76%~23.34%, and 0.63%~9.72%, respectively, with the average of 19.65%, 14.94%, and 4.71%, respectively. There are significant differences of the TDF content among different common buckwheat varieties and among different places, respectively. There exist significant differences of the NSDF content among different places and non-significant variations among different varieties. As for WSDF content, however, there are significant differences among common buckwheat varieties and non-significant variations among different locations. Scott-Knott clustering analysis showed that there are three groups of varieties and four groups of places in accordance with the TDF content, four groups of places in accordance with the NSDF content,three groups of varieties in accordance with the WSDF content. Correlation analysis indicated that dietary fiber content has no significant correlations with altitude and mean temperature in the growth period. Latitude is significantly associated with TDF(r=0.637**), NSDF(r=0.651**) of Yuqiao-4, respectively, indicating that Yuqiao-4 has higher sensibility to latitude than the others.