The variation and relationships among Fe,Se,Zn,Cu,Mn,Ca,Mg,K,Na and P in brown rice of 196 F3 lines,which derived from a cross between japonica rice varieties,Longjin 1 and Xiangruanmi 1578,were analysed.The results showed that there were high variation among these mineral element contents in brown rice for F3 lines.The variation coefficient of Na content was the highest(77.69%),whereas that of Zn content was the lowest(12.04%).The variation coefficient values in brown rice were as follows: Na>Se>Cu>Fe>Mg>Mn>Ca>P>K>Zn.The various mineral element contents were also obviously different,their mean values in brown rice for F3 lines were as follows: P>K>Mg>Ca>Fe>Mn>Zn>Na>Cu>Se.Moreover,these mineral element contents all followed the normal distribution,indicating they were quantitative traits controlled by multiple genes.Zn was significantly positive correlative with Fe and Cu at 0.01 or 0.05 levels,so were Mn with Mg,Ca,K and P;Ca with Mg,K,Na and P;Mg with K and P;P with K and Na.However,the contents of Fe and Se,Mn and Na,Mg and Na displayed significantly negative correlation at 0.01 or 0.05 levels.Furthermore,Mn,Ca,Mg,K and P correlated much more closely with other mineral element contents than Fe,Se,Cu and Zn did.
