Abstract
The present study examined the correlation between phenolic acids and flavonoids with high rice yield traits of rice. It was observed that the difference of phenolic contents among the tested rice lines occurred only in the vegetative stage. The concentrations of phenolic acids were higher in the rice high yield cultivars than low yield variety in the vegetative stage, but they either decreased dramatically or disappeared during the development stage. Caffeic acid was found only in high yield rice, whereas chlorogenic acid was detected only in low yield rice. Sinapic acid was the dominant phenolic acid in high yield cultivars at vegetative stage (3.7 mg/g), followed by ferulic acid (1.2 mg/g). These findings suggest that caffeic acid, ferulic acid, sinapic acid and chlorogenic acid may play a particular role in forming yield components in rice. The cultivar B3 contained high amount of sinapic acid may be used as a natural source for pharmaceutical use.
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