Department of Plant Agriculture, University of Guelph, 50 Stone Road East, Guelph, Ontario N1G 2W1, Canada.
J Agric Food Chem. 2013 Apr 24;61(16):3941-8. doi: 10.1021/jf3030216. Epub 2013 Apr 12.
Biochemically, starch is composed of amylose and amylopectin but can also be defined by its digestibility rates within the human intestinal tract, i.e., rapidly digested (RDS), slowly digested (SDS), or resistant (RS). The relative ratio of these starch components is the main contributor to differences in the glycemic index (GI) of carbohydrate sources. This study evaluated the digestible starch profile of 12 potato genotypes comprising elite breeding lines and commercial varieties in six environments, with the optimal profile defined as low RDS and high SDS. Genotype by environment interaction (GEI) analysis found significant (p = 0.05) genotypic and environmental effects for all digestibility rate components; however, interaction effects were only significant for SDS. Optimal starch profiles were identified for two genotypes, CV96044-3 and Goldrush. The desirable starch profile in these potato cultivars can be exploited in breeding programs for the improvement of starch profile and other important characteristics such as high yields and disease resistance.
从生化角度来看，淀粉由直链淀粉和支链淀粉组成，但也可以根据其在人体肠道中的消化率来定义，即快速消化（RDS）、缓慢消化（SDS）或抗性（RS）。这些淀粉成分的相对比例是碳水化合物来源血糖生成指数（GI）差异的主要原因。本研究评估了 12 种马铃薯基因型在 6 种环境下可消化淀粉的特征，最佳特征定义为低 RDS 和高 SDS。基因型与环境互作（GEI）分析发现，所有消化率成分均存在显著（p = 0.05）的基因型和环境效应；然而，仅 SDS 存在交互效应。确定了两个基因型（CV96044-3 和 Goldrush）的最佳淀粉特征。这些马铃薯品种的理想淀粉特征可用于改良淀粉特征和其他重要特性（如高产量和抗病性）的育种计划中。
