The enhancement of rooting of willow cuttings and plant growth was associated with the increased physiological activity in cells and tissues, which was expressed by greater index of chlorophyll content in the leaves, activity of net photosynthesis, transpiration, and stomatal conductance, but lower intercellular CO2 concentration as well as higher activity of acid (pH=6.0) and alkaline (pH=7.5) phosphatase, RNase, and dehydrogenase, and decreased electrolyte leakage from leaves (Tables 2 and 3, Fig. 3).