人工老化对不同Wx基因型稻米品质及RVA谱的影响  

Effects of Artificial Accelerated Aging on Cooking and RVA Properties of Rice Grains with Different Wx Genotypes

作　　者：滕斌[1] 杜士云[1] 周俊峰 李泽福[1] 罗志祥[1] 吴敬德[1] 张瑛[1] 

机构地区：[1]安徽省农业科学院水稻研究所安徽省水稻遗传育种重点实验室,合肥230031

出　　处：《分子植物育种》2016年第6期1595-1601,共7页Molecular Plant Breeding

基　　金：安徽省自然科学基金(1508085MC46);安徽省科技攻关项目(1604A0702008);杂交水稻国家重点实验室(武汉大学)开放课题基金(KF201502);安徽省农科院学科建设项目(16A0102)和种子工程项目(16D0101)共同资助

摘　　要：为了解不同Wx基因型稻米在贮藏过程中的食用蒸煮品质和RVA谱变化,采用高温高湿人工加速老化方法,对5个携有不同Wx等位基因水稻品系的种子在87.5%相对湿度和42℃条件下分别处理0、5 d、10 d、15 d、20 d、25 d和30 d。结果显示,经高温高湿老化处理后,稻米直链淀粉含量、碱消值和胶稠度的变化不大,而RVA谱特征值在整个老化过程中存在较大波动。总体来看,消减值的变异系数最大,达20.71%;其次是崩解值和回复值,分别达到17.52%和14.25%;峰值时间和起浆温度的变异系数最小,只有2.34%和0.91%。不同Wx基因型稻米RVA特征值在老化过程中的稳定性并不一致。其中,Wxt基因型稻米的最高黏度和崩解值变异幅度最小;Wxg1基因型稻米的热浆黏度、消减值、回复值和峰值时间最为稳定;Wxg2基因型稻米冷胶黏度的波动最小。本研究结果,可为今后在水稻品质耐储藏实践中延缓稻米品质的劣变提供理论依据和参考。To ma ke clear the changes in cooking and pasting properties of rice grains with different Wx genotypes during storage, five rice accessions with different Wx alleles were treated of artificial accelerated aging with high temperature and high humidity, i.e., seeds were stored in 87.5% relative humidity and 42℃ for 0 d, 5 d,10 d, 15 d, 20 d, 25 d and 30 d. The results showed that there were no significant differences in amylose content,alkali spreading value, and gel consistency during the process of accelerated aging. However, the RVA properties were sensitive to the aging process and exhibited very wide changes. In general, setback form peak viscosity(SB_P), breakdown(BD), and setback form hotpaste viscosity(SB_H=CPV-HPV) showed high values of variation coefficient, which reached to 20.71%, 17.52%, and 14.25%, respectively. Variation coefficients of peak time(Ptime) and pasting temperature(Ptemp) were relatively low, and they were only 2.34% and 0.91%, respectively.The variations in RVA characteristics of rice with different Wx genotypes were not consistent during the process of aging. Among them, PV and BD of the Wxtgenotype rice had the lowest degree of variation. The most stable values in HPV, SB_P, SB_H and Ptime were found in the Wxg1 genotype rice. Besides, the Wxg2 genotype rice showed the lowest variation in CPV. The present results have important implications for delaying the deterioration of rice quality in improvement rice grain storability.

关 键 词：水稻 人工加速老化 Wx基因型 淀粉RVA谱 稻米品质 

分 类 号：S511[农业科学—作物学]