稻米淀粉RVA谱特征及其与理化品质性状相关性的研究

测定了四川地区种植的124个水稻品种的RVA谱特征值及各项理化品质指标, 分析了RVA谱各特征值间, 及其与各项理化品质指标间的相关性, 并分析了不同直链淀粉含量(AC)品种的RVA谱特征值差异, 结果表明, RVA谱6个特征值之间, 最高黏度(PKV)与冷胶黏度(CPV)、回复值(CSV)相关不显著, 热浆黏度(HPV)与崩解值(BDV)相关显著, 其余均相关极显著。AC、胶稠度(GC)与RVA谱6个特征值均极显著相关, 而碱消值(ASV)与RVA谱6个特征值相关均不显著, 说明AC和GC是影响RVA谱特征值的两个重要理化品质指标。不同AC品种间的RVA谱不尽相同, 一般而言, AC越高的品种崩解值越小, 而消减值和回复值越大。

Rice RVA Profile Characteristics and Correlation with the Physical/Chemical Quality

In this paper, we determined rice RVA profile characteristics and their physical/chemical quality indicators of 124 varieties grown in Sichuan Province, and studied the relationship among RVA profile characteristics and between RVA profile characteristics and physical/chemical indicators. To study the differences of RVA profile characteristics of rice varieties with different amylose contents (AC), we divided these varieties into six groups, including waxy rice, low AC, moderate lower AC, moderate AC, moderate higher AC, high AC, and analyzed the differences of RVA profile characteristics between the latter five groups of no-waxy varieties, and the influence of AC on RVA profile characteristics. There were no significant correlation between peak viscosity (PKV) and cool paste viscosity (CPV), and between PKV and consistence (CSV), but significant correlations among other RVA profile characteristics with each other at P = 0.01 except hot paste viscosity (HPV) with breakdown (BDV) at P = 0.05. CPV significantly positive correlated to CSV, with the correlation coefficients of 0.94. Six RVA profile characteristics had signifi-cant correlations with AC and gel consistency (GC) at P = 0.01, AC significantly positively correlated to GC, with the correlation coefficients of -0.82 at P = 0.01; alkali-spreading value (ASV) had no significant correlation with AC, GC, and six RVA profile characteristics. Varieties with different AC had different RVA profile characteristics, when AC was higher, setback (SBV) and CSV were higher and BDV lower.