Study On The Relationship Of Yield Traits, Quality Traits And Panicle Characteristics In Rice

Rice yield, quality and panicle traits and their relationships were studied by the field control test and the indoor assay determination method, in 2007, in rice Research institute, Shenyang Agricultural college. This research's results are as follows:1. In northeast japonica rice locations, the relationship of the yield traits, quality traits and panicle traits indicated that adapt increasing of biomass based on stabilization of harvest index, could realize the object such as: Panicle number per plant (PNPP) is 14-16 per point, grain number per panicle (GNPP) is 150-170 per panicle, 1000 grain weight (1000-GW) is about 24g, Seed Setting Rate (SSR) is more than 93%, panicle length(PL) is about 24cm, panicle neck weight(PNW) is 1.4-1.6mm, then could realize the finally object of high yield with good quality.2.The results of path analysis between yield and panicle traits in 45 rice cultivars of Liaoning province showed there was close correlation with yield. The direct effect of grains per panicle among panicle traits on yield was the greatest, while the effect of grain density and panicle length on yield was negative. Therefore, high yield could obtain from increasing grains per panicle and meanwhile increasing properly panicle length that were sure to have proper grain density. There was significantly correlation between biomass yield, economic coefficient and yield, which showed that enough biomass yield and greater economic coefficient could get high yield. High yield could obtain from biomass yield increase and economic coefficient through increasing seed setting rate on the secondary branch, 1000-grain weight, seed setting rate on the primary branch and secondary branch length 3.There was close correlation between panicle traits and quality traits. Almost all panicle traits had more or less different degree effect on quality traits. The most effect factors were the number of primary branch and primary branch length in terms of processing quality. The most effect factors were secondary branch length, 1000-grain weight and the number of secondary branch in terms of chalkiness index. The most effect factors were secondary branch length, spike number, grains per panicle, the number of primary branch and seed setting rate on the primary branch in terms of rice shape. The most effect factors were spike number, spike number, 1000-grain weight, the number of grains on the primary branch in terms of cooking and eating quality of rice. The most effect factor was seed setting rate, especially secondary seed setting rate in terms of nutritional quality. The most effect factors were seed setting rate on the primary branch and panicle length in terms of taste quality.Blown rice percentage, Milled rice percentage and Head rice percentage had significant or most significant negative correlation with grain length and ratio of grain length to width, and had significant or most significant positive correlation with grain width, which showed that processing quality of stubby rice grains was better than that of slight rice grain. Chalkiness size had most significant positive correlation with chalkiness degree, grain length and ratio of grain length to width, and had most significant negative correlation with grain width, which showed that appearance quality of slight rice cultivars stubby rice grains was lower. Protein content had most significant positive correlation with grain length and ratio of grain length to width, and had most significant negative correlation with grain width, which indicated that protein content of slight rice grains was higher than that of stubby rice grain, while taste quality showed reverse trend. 1000-grain weight had significant negative correlation with chalkiness size, and had significant or most significant positive correlation with grain width and fatty acid ,which showed that rice of lower grain weight had great chalkiness area and wider grains was in favor of increase 1000-grain weight.