Abstract: The inhibitive effect of tea-polyphenols (TP) on Pyricularia oryzae at different concentrations and the inhibitive mechanism were studied. The results showed that TP had strong inhibition on hytha growth and conidia germination. With the increasing of TP concentration, the inhibition was increased. The inhibitive efficiency at the concentrations of 5.00 mg/mL and 10.00 mg/mL was the highest, and the inhibitive ratio achieved 100%. The conidia distorted, the cell burst, and the protoplasm overflowed in this condition. The action mechanism of TP was: TP destroyed the structure of cell membrane, strongly inhibited the enzyme activity of CAT, POD, made the cell lose the protection of cell membrane barrier and enzyme system, and finally lead the growth of fungi to be inhibited or die.

Key words: tea-polyphenols, Pyricularia oryzae, inhibition, inhibitory mechanism