赣鄂两省早籼稻谷的品质分析

    QUALITY ANALYSIS OF EARLY INDICA RICE IN JIANGXI AND HUBEI PROVINCES

    • 摘要: 了解2015年产于赣鄂两省早籼稻谷的品质性状,可为后期筛选影响稻谷食味品质指标及加快品质改良进程提供数据参考。对赣鄂两省82份早籼稻谷的外观品质(粒型、垩白粒率、垩白度)、理化特性(直链淀粉含量、粗蛋白含量和粗脂肪含量)、糊化特性及食味品质等指标进行了测定。结果表明:所测定的21项指标中,17项品质指标的变异系数大于10%,说明收集的样品处于不同的品质水平,具有较好的代表性;试样的长宽比、垩白度、垩白粒率、直链淀粉含量达到国家优质稻谷标准三等及以上要求的比例分别为43.9%、17.1%、26.8%、63.4%。对样品品质指标进行相关性分析发现,其粒型、垩白粒率、垩白度、直链淀粉含量、碘蓝值、最低黏度、衰减值是影响早籼稻米综合适口性的重要指标。主成分分析法发现,前3个主成分的累计方差贡献率达到71.5%,包含了大部分稻谷样品的品质特征。其中,第1、第2和第3主成分的贡献率分别为50.8%、13.2%和7.5%。第1主成分将湖北省和江西省的试样分为两类,湖北省产的早籼稻具有高垩白粒率、高垩白度、高直链淀粉含量、低衰减值等特点,而江西省产的早籼稻则具有低垩白粒率、低垩白度、低直链淀粉含量、高衰减值等特点。

       

      Abstract: The understanding of the quality traits of early Indica rice produced in Hubei and Jiangxi provinces of 2015 will provide reference data for the quality index of cooked rice and quality improvement.This study was conducted to determine appearance quality (grain type,chalkiness and chalky kernel percentage),the physical and chemical characteristics (amylose,crude protein and crude fat content) and pasting characteristics and cooking quality of 82 early Indica rice samples produced in Jiangxi and Hubei provinces.The results showed that the variation coefficient of 17 quality indexes was greater than 10% in the 21 indexes tested,which implied that the samples collected in this study were of different quality levels and had good representativeness.The proportions of chalkiness,chalky kernel percentage and amylose contentreaching to the third-grade of national standard of paddy were 17.1%,26.8%,63.4% and 43.9%,respectively.Correlation analysis found that the grain shape,chalky kernel percentage,chalkiness,amylose content,the blue value of iodine,trough value and breakdown value were the important indexes to affect the comprehensive palatability of early Indica rice.The results of principal components analysisshowed that the cumulative variance contribution rate of the first 3 principal components was 71.5%,which included the quality characteristics of most rice samples.The contribution rates of the first,second and third principal component were 50.8%,13.2% and 7.5%,respectively.The samples were divided into two types according to the first principal component,which were Hubei and Jiangxi provinces two categories.The early Indica rice produced in Hubei province had the characteristics of high chalkiness rate,high chalkiness,high amylose content and low breakdown value,while the early Indica rice in Jiangxi province had the opposite trend of the above characteristics.

       

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