盐胁迫对两种锦鸡儿幼苗生理指标的影响

用NaCl胁迫白皮锦鸡儿(Caragana leucophloea)和镰叶锦鸡儿(C.aurantiaca)的一年生幼苗，NaCl质量分数为0.2%、0.4%、0.6%、0.8%和1.0%，盐胁迫7和15 d后取样，测定其叶片相对电导率、丙二醛(MDA)、脯氨酸(Pro)含量。结果表明，随着NaCl质量分数的增加和胁迫时间的延长，白皮锦鸡儿叶片相对电导率逐渐降低，而镰叶锦鸡儿相对电导率有所增加；随盐质量分数的增加，白皮锦鸡儿MDA含量先降低后升高，而镰叶锦鸡儿MDA含量逐渐升高；当两种锦鸡儿植株受到盐胁迫时，叶片内脯氨酸含量迅速上升来维持渗透平衡。综合各项指标，白皮锦鸡儿抗盐能力较强，镰叶锦鸡儿抗盐能力较弱。

Effects of salt stress on physiological indexes of Caragana leucophloea and Caragana aurantiaca seedlings

This study was to evaluate the physiological changes of Caragana leucophloea and C.aurantiaca seedlings under salt stress.One year old of C.leucophloea and C.aurantiaca seedlings were treated with 0.2%,0.4%,0.6%,0.8% and 1.0% NaCl solution for 7 and 15 days,respectively.Leaf relative conductivity,contents of MDA and proline(Pro) of the seedlings were measured.The results showed that with increased NaCl concentration and longer of stress time,the leaf relative conductivity of C.leucophloea gradually decreased whereas the leaf relative conductivity of C.aurantiaca gradually increased.The MDA content of C.leucophloea decreased at first and then increased;MDA of C.aurantiaca gradually increased when NaCl concentration increased or salt stress was prolonged.When C.leucophloea and C.aurantiaca.plants were subjected to salt stress,the Pro content in leaves went up in order to maintaining the osmosis balance.Ultimately through overall assessment,it was concluded that salt-tolerance of C.leucophloea was higher compared wit C.aurantiaca.