to the methods of Sauter and Kende (1992) by
taking 500 mg of fresh plant tissue was
homogenized in 5 ml of cold 25 mM borate-HCl
buffer (pH 8.8) containing 5 mM marcaptoethanol
and 1 % Polyvinylpyrrolidone and centrifuged at
12000 rpm for 20 min. The reaction mixture for
assaying PAL contained 0.5 ml 100 mM potassium
borate buffer (pH 8.8), 0.2 ml enzyme extract, 1.3
ml water and 1 ml L- phenylalanine (50 mM) and
kept for 1 h for incubation at room temperature.
The reaction was stopped by adding 10 % TCA and
the absorbance was recorded at 290 nm. The
activity was expressed μ mol trans–cinnamic acid
formed h-1 mg-1 protein using cinnamic acid as
standard.
The reaction mixture for the assay of CAD
contained 1.8 ml tris-HCl (400 mM) buffer (pH 9.2),
0.5 ml coniferyl alcohol (15 mM), 0.5 ml NADP+
(0.28 mM) and 0.2 ml enzyme extract. The
absorbance at 400 nm was monitored for 3min. The
activity was expressed in change