盐胁迫对不同品种黄瓜幼苗生长及生理指标的影响

Effects of Salt Stress on Growth and Physiological Indexes of Different Varieties of Cucumber Seedlings

[目的]为指导内蒙古中部盐渍化地区进行黄瓜品种选择和黄瓜抗盐性深入研究。[方法]对该地区主栽的中农12号和津优1号2个黄瓜品种的幼苗进行营养液水培,并给予NaCl胁迫方法。[结果]盐胁迫后2个品种的生长指标均受到抑制,活性氧代谢增强。中农12号的株高、茎粗和壮苗指数的受抑制程度显著小,根系活力和叶绿素含量降低量也较小,丙二醛积累较少,游离脯氨酸含量和过氧化物酶活性的升高幅度较大。[结论]中农12号的抗盐能力明显优于津优1号。

[Objective] The research aimed to guide the selection of salt resistance cucumber varieties in salinization central Inner Mongolia and the study of cucumber salt resistance.[ Method] Cultivate two varieties of cucumber（ Zhongnong NO. 12 and Jinyou NO. 1） seedlings in hydroponic nutrient solution with NaCl stress. [Result]After salt stress,growth indexes of two species were inhibited,and active oxygen metabolism was enhanced. Zhongnong NO. 12＇s plant height,stem diameter and index of high quality seedling were significantly less affected by salt stress. Root activity and chlorophyll content in leaves were dropped a little. MDA content was less accumulated,and free proline content and POD activity in leaves were all significantly increased. [Conclusion] Zhongnong NO. 12 had better salt tolerance than Jinyou NO. 1.