Effects of four kinds of exogenous hormones on the germination and seedling growth of Leymus chinensis

The effects of Gibberellic Acid(GA3) and 3-Indoleacetic acid(IAA) with the concentrations of 100～600 μg/g,6-Benzyl Aminopurine(6-BA) and Abscisic Acid(ABA) with the concentrations of 25～100 μg/g on the germination and seedling growth of Leymus chinensis were investigated in this paper.The results showed that 100～300 μg/g GA3 and IAA,25 μg/g 6-BA promoted the germination and the effects were in the order of GA3IAA6-BA.However,when the concentrations of GA3 and IAA were higher than 400 μg/g or the 6-BA higher than 50 μg/g,the final germination percentages would be limited.ABA with the concentration of 25～100 μg/g showed no inhibitory effect on the final germination of L.chinensis seeds.The shoot length was promoted only by GA3 while limited by IAA and 6-BA but the root length and root/shoot ratios were all limited by the three kinds of hormones.All of the ABA treatments in this paper showed no significant effects on the lengths of shoot and root,the root/shoot ratios.