粳稻不同发育时期剑叶含氮量与稻米食味品质的关系

为定量分析水稻剑叶含氮量、籽粒蛋白质含量与食味值的相互关系,改善稻米的食味品质,以46份不同地理来源的优质粳稻品种为材料,测定抽穗后不同发育时期剑叶的含氮量,并于成熟期收获籽粒测定蛋白质含量及稻米食味值.结果表明,抽穗期和抽穗后7 d剑叶含氮量与食味值相关系数最大,分别为-0.635**和-0.661**.并通过多元逐步回归和聚类分析建立了根据剑叶含氮量预测稻米食味值的最优回归方程Y=74.879-2.450 X_1-2.622 X_2,且发现当抽穗期和抽穗后7 d剑叶含氮量小于或等于3.7%时,稻米食味值较高.

The Relation between Flag Leaves at Different Growth Stages and Eating Quality of Japonica Rice

This study aimed to analyze the relationship between the nitrogen content of flag leaves,grain protein content and taste value in japonica rice,and to improve eating quality of Japoniaca rice.Using 46 varieties from different geographical sources for research materials,this study measured the nitrogen content of flag leaves after heading stage,and mesured protein content and taste value at kernal maturity stage.The result showd that correlation coefficient between nitrogen content of flag leaves heading stage and seven days after heading with taste value were maximal,ie 0.635** and 0.661**respectively.We constructed a optimum regression equation about rice eating quality by multiple stepwise regression and clustering analysis,ie Y=74.879-2.450X_1-2.622X_2,and the rice taste was excellent when the nitrogen content of flag leaves in heading stage and after seven days was equal to or blow 3.7%.