A Study on Flavone Contents in Rice Bran of Various Varieties

Sixty-four rice varieties and germplasms with different colors of seed coat were employed to study the flavone contents in rice bran under different environment conditions.The results showed as follows:①The flavone contents in rice bran were significantly different from early and late planting-seasons.The mean flavone content from early planting-season rice bran was 0.015 g/100 g,and that from late planting-season rice bran was 0.827 g/100 g,making 5.51 times as much as that from early planting-season rice bran.②From both early and late planting-season rice,the flavone content in rice bran of various color rice were significantly different.From early planting-season rice,the mean flavone content in rice bran of black rice was 1.28 times as much as that of red rice,and was 8.83 times as much as that of white rice,the mean flavonoid content of red rice was 6.87 times as much as that of white rice.From late planting-season rice,the mean flavone content in rice bran of black rice was 5.52 times as much as that of red rice,and was 31.43 times as much as that of white rice,the mean flavone content of red rice was 5.69 times as much as that of white rice.③Influence degrees of difference environmental conditions were different.The flavone content in rice bran of white rice,red rice,black rice from late planting-season rice were 1.74 times,1.27 times,7.15 times as much as those from early planting-season rice.