Grain quality of new Indica conventional rice varieties in Guangxi province
Twelve grain quality traits of 25 new inbred varieties in regional test of Guangxi province in 2010 were analyzed.The results showed that no conventional rice variety reached the 1st class standard of all the seven traits.These traits included brown rice rate(BR),head rice rate(MR),length/width(L/D),percentage of chalky grain(PCG),chalkiness degree(CD),gel consistency(GC) and amylose contents(AC).High PCG,CD,and low GC were the major factors which limited the improvement of the rice quality in Guangxi province.The quality of late rice was better than that of the early rice.The correlations between MRR and PCG,MRR and CD were negative at the 0.01 level,respectively,and correlation between MRR and protein content(PC) was positive at the 0.05 level.The principal component analysis showed that the main quality components of indica conventional rice varieties were milling factors,cooking factors and appearance factors.The cluster analysis between quality characteristics showed that the quality characteristics of indica conventional rice varieties in Guangxi province were similar.