【摘要】 通过喷施适宜浓度的外源水杨酸和脱落酸,研究不同品种苜蓿幼苗在低温胁迫下的生理响应。结果表明,SA、ABA、SA+ABA处理可以显著提高苜蓿幼苗的地上部干质量和株高,SA、SA+ABA处理可以显著提高苜蓿幼苗体内可溶性糖的含量,ABA、SA+ABA处理可以显著提高苜蓿幼苗体内脯氨酸的含量,均以SA+ABA处理效果最显著。同时喷施SA和ABA这2种信号物质可以显著提高苜蓿幼苗体内SOD和POD的酶活性,但CAT酶活性与对照差异不显著。单独喷施SA或ABA可以显著提高苜蓿幼苗体内POD和CAT的酶活性,而SOD酶活性与对照差异不显著。3个苜蓿品种的抗寒性差异十分显著,由高到低,依次为公农1号>金皇后>三得利。更多还原

【Abstract】 Through spraying the appropriate concentration of the exogenous salicylic acid and abscisic acid,to research the physiological responses to exogenous SA and ABA in alfalfa varieties under chilling stress,the results show that the SA,ABA,SA+ABA treatment can improve the dry weight and plant height of alfalfa seedlings significantly,the SA,SA+ABA treatment can improve the contents of soluble sugar of the alfalfa seedlings significantly,the ABA,SA+ABA treatment can improve the proline contents of the alfalfa seedlings significantly,with SA+ABA treatment the most significant of all.Spraying SA and ABA signal material together can greatly improve the enzyme activity of SOD and POD in the alfalfa seedlings,but CAT enzyme activity with no significant difference to contrast.Spraying SA or ABA separately can greatly improve the enzyme activity of POD and CAT in the alfalfa seedlings,but SOD enzyme activity with no significant difference to contrast.The differences of hardiness with the three alfalfa varieties under chilling stress was significant,from high to low,which in turn for:Gongnong No.1>Golden Empress>Sandeli.更多还原