籼粳稻杂交后代蒸煮食味品质与亚种分化的关系

以2个典型籼粳稻杂交重组自交系F8群体(中优早8号×丰锦,计158株系;七山占×秋光,计142株系)为试材,利用程氏指数法鉴别其籼粳属性,同时测定稻米食味品质及淀粉RVA特征值,分析籼粳杂交后代稻米蒸煮食味品质与籼粳亚种性状特征的关系。结果表明:1)2个群体程氏指数、口感、综合评分及RVA谱特征值均呈连续分布,大部分株系介于双亲值之间;2)程氏指数与口感、综合评分及各RVA谱特征值的相关不显著或相关系数较小,依据程氏指数划分的类型间口感、综合评分及RVA谱特征值无明显差异,说明籼粳分化对稻米食味品质无直接影响;3)随着口感改善和综合评分的提高,热浆黏度、冷胶黏度、消减值降低、回复值升高,其他RVA谱特征值变化规律性不明显。

Relationship Between Cooking eating Quality and Subspecies Differentiation in RILs Population from indica and japonica Crossing

Two  recombinant inbred lines(RILs) populations, one derived from the cross between Zhongyouzao 8(indica) and Toyonishiki(japonica), the other derived from the cross between Qishanzhan(indica) and Akihikari(japonica), were used to identify indica japonica subspecies differentiation of hybrids by Cheng’s index method and to determine the eating quality and RVA profile characteristic value of rice, to analyze the relationship between cooking eating quality and subspecies differentiation in RILs populations from indica japonica crossing. The number of lines from Zhongyouzao 8/Toyonishiki and Qishanzhan/Akihikari are 158 and 142,respectively. The results showed that: 1) Cheng’s index, taste, comprehensive score and RVA characteristics of the two RILs populations followed a continuous distribution, with most lines being mid parent type. 2) There were insignificant correlations or low correlation coefficients between Cheng’s index and taste, comprehensive score, RVA characteristics. There were insignificant differences among taste, comprehensive score and RVA characteristics for different subspecies based on Cheng’s index. It showed that indica japonica differentiation had no direct influence on cooking eating quality. 3) With the rising taste and comprehensive score, hot paste viscosity, cool paste viscosity, setback viscosity, consistence viscosity  decreased and  breakdown viscosity  increased, other RVA characteristics did not change obviously.