Effects of different clones and inducing time on agarwood quality in grafted Qi-Nan Aquilaria sinensis (Lour.) spreng.

RH showed a trend of first increasing and then decreasing, whereas XGY demonstrated a gradual decline in concentration, with the concentration after two years being only 8.72% of that after half a year ( Fig 2b ). 3.4 Changes in the concentrations of the two PECs The content of 2-(2-phenethyl) chromone and 2-[2-(4-methoxy) phenethyl] chromone are two crucial PECs for evaluating the quality of Qi-Nan.

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