Would explain overgrowth, and auxin oxidation is slower in gall extracts.Explains why auxin oxidation is slower in the extracts - oxidising agents draw electrons of these compounds, before degrading auxin.The phenolic compounds dominate the fractions that reduce auxin oxidation.There is no need, since they act to reduce auxin oxidation instead.An upregulation explains how gall wasps increase the ability of phenolic compounds to protect auxin from oxidation. An increase in PPO gives more reducing agent.