Table 5.

The effect of nitrogen levels on soluble protein and PAL activity in L. pumila.

Nitrogen levels	Soluble protein(mg/g fresh weight)	PAL (Phenyl-alanine-lyase) activity (nM transcinnamic/mg protein/h)
0 kg N/ha	2.67 ± 0.24 d	26.71 ± 0.78 d
90 kg N/ha	3.87 ± 0.12 c	21.45 ± 1.21 c
180 kg N/ha	8.26 ± 0.09 b	13.65 ± 0.98 b
270 kg N/ha	11.76 ± 0.78 a	7.68 ± 0.87 a

All analyses are mean ± standard error of mean (SEM), N = 18. Means not sharing a common single alphabet were significantly different at P ≤ 0.05.