The Response Of Tall Fescue (Fetuca Arundinacea Schreb) To NaCl Stress

This study was focused on the physiological strain of Tall Fescue (Festuca arundinacea Schreb ) on different salt stress levels. The Tall Fescue seedlings were treated by eight salt levels. We got some important information of the law about growth and partitioning of Tall Fescue under different salt conditions. The main results were as follows:Growth reduction by salt treatment was significantly greater in shoot than that in root. The half of the lethal salt concentrations of shoot and root would get stabile only after a long treatment- time. Because of this, we should put more attention on the treatment-time, if we want to use the half of the lethal salt concentration to judge the capacity of plant fastness to salt.As the salt content increased, the sodium and chloride content of plant increased also. After 36-day treatment, the plants grew under 50~100 mmol.L-1 salt levels had the most amount of salt ions.Different changes of K+ content taken place of root and shoot, as treatment-time went along. As time went by, the content of K+ of root increased, on the contrary that of shoot decreased. As the salt levels increased, the capacity of uptake selectivity and transport selectivity of K+ would increased also on some degree.Salt would stimulate plant to absorb Ca2+, if there is an enough supply of Ca2+ around. This shown us, under salt stress, Tall Fescue adjust itself on nutrition absorption.Salt stress can decrease the total content of N on shoot obviously ,but this change has no relation with time. Under salt stress, threr is a positive correlation between N content and dry mass. Perhaps the NaCl-induced inactivation of photosystems was the reason of this phenomenon.