香稻品种RVA谱多样性研究

对来自不同种植区域的593份香稻材料(香糯稻152份,香籼稻342份,香粳稻99份)进行了RVA谱的多样性分析。结果表明,香糯稻以最终粘度的变异系数最大,为42.9,香籼稻和香粳稻以回生值的变异系数最大,分别为71.9和76.1。按遗传多样性指数(Shannon-wiener多样性指数)的分级标准计算,不同种质资源RVA谱特征值的分级情况复杂,除了峰值时间分布相对集中外,其他特征值的分级情况差别较大。RVA谱各特征值的遗传多样性指数均大于1.0,香糯稻峰值粘度和最终粘度的遗传多样性指数高达2.02和2.01,香籼稻和香粳稻均以回生值的遗传指数最高,分别为2.09和1.99。不同香稻种质间的淀粉糊化特性潜在分异明显。

DIVERSITY ANALYSIS OF RVA PROFILES OF AROMATIC RICE

593 aromatic rice accessions originated from different regions were comparatively studied by analyzing their starch rapid visco analyser (RVA) characters. The result indicated that among the tested aromatic rice accessions there were significant diversities in pasting properties of rice starch except peak time and pasting temperature. The coefficient of variance (CV) of final viscosity of aromatic waxy rices reached 42.9, the CV of setback of aromatic indica and japonica rices reached 71.9 and 76. 1, respectively. There were clear differences in frequency distributions of the RVA profile character. The generalized Shannon-wiener genetic diversity index of each character was calculated and all of indices were more than 1.0, among them the peak viscosity and final viscosity of aromatic waxy rices reached 2.02 and 2.01, the setback of aromatic indica rices and the aromatic japanica rices reached 2.09 and 1.99, respectively.