Factor analysis on rice quality under different environments

Factor analysis method was applied to study 13 rice quality traits of 62 rice varieties under different environments．The results show that the cumularive contributions made by the former 5 main factors for variation are above 89．0％．In early season，chalky grain rate (CGR)，chalkiness (CH)，brown rice rate (BRR)，milled rice rate (MRR)，head rice rate (HRR)，broken rice rate，ratio of brown rice width to thickness (WTR)and ratio of brown rice length to width (LWR) are the main factors，which affect the rice quality，while in late season brown rice width (BRW)，head rice rate (HRR)，milled rice rate (MRR)，brown rice length (BRL)and amylose content (AC) are the main factors，Which affect the rice quality．There is a positive correlation between main factors，such as chalk and broken rice rate，WTR and LWR，BRR and WTR in early season．There exists a positive correlation between main factors，such as BRW，MRR and AC，MRR ，BRL and AC in late season，while there is a negative correlation between main factors，such as cha lk and BRR，MRR and HRR，BRR，MRR，HRR and BRR，WTR and LWR，BRR and LWR，WTR and LWR in early season．There exists a negative correlation between main factors，such as BRW and HRR ，MRR，BRL and AC，HRR and BRL．MRR and AC in late season．