The leaves were excised at the base of the stem using a razor blade, and 10mM Na-citrate buffer (pH 6.0) containing 6 mM nitroblue tetrazolium (NBT) was supplied through the site of excision
The leaveswere excised at the base of the stem using a razor blade, and 10mMNa-citrate buffer (pH 6.0) containing 6 mM nitroblue tetrazolium(NBT) was supplied through the site of excision