羊草早期幼苗在盐、碱生境下生长与生理适应性的研究  

Study on Growth and Physiological Adaptability of Leymus chinensis in Early Seedlings Stage under Salt and Alkali Environments

作　　者：蔺吉祥[1] 张兆军[1] 李晓宇[2] 唐佳红[1] 王俊锋[1] 穆春生[1] 

机构地区：[1]东北师范大学草地科学研究所/植被生态科学教育部重点实验室,吉林长春130024 [2]中国科学院东北地理与农业生态研究所,吉林长春130012

出　　处：《中国草地学报》2011年第6期64-69,共6页Chinese Journal of Grassland

基　　金：国家自然科学基金项目(31172259);中央高校科研业务费专项资金(10SSXT145)资助

摘　　要：为明确羊草早期幼苗在盐、碱生境下的适应机制,混合两种中性盐(NaCl∶Na2SO4=9∶1)与两种碱性盐(Na2CO3∶NaHCO3=9∶1)分别模拟不同强度的盐、碱胁迫条件,测量羊草幼苗在两种胁迫下的生长与生理指标变化。结果表明:与盐胁迫相比,羊草幼苗在碱胁迫下的生长量、鲜重及含水量下降幅度更大。盐、碱胁迫均造成幼苗Na+浓度与Na+/K+升高,K+浓度下降,碱胁迫下这三种指标变化幅度均大于盐胁迫。盐胁迫下,羊草幼苗大量积累Cl-,有机酸含量变化不大;碱胁迫下,Cl-、NO3-与H2PO4-均呈下降趋势,而有机酸则大量积累。另外,脯氨酸与可溶性糖含量随盐、碱胁迫强度的增加而增加,且碱胁迫下积累量更大。碱胁迫由于其高pH值对羊草早期幼苗生长的抑制作用更强,Cl-与有机酸积累特征的差异表明,羊草早期幼苗在盐、碱生境下具有不同的生理适应策略。The main growth and physiological index of Leymus chinensis seedlings under salt （NaCl： Na2SO4=9 ： 1） and alkali （NaHCO3 ： Na2CO3 = 9 ： 1） stresses were measured in order to explore the physiological adaptive mechanisms of this species to such conditions in early seedling stage. The results showed that reductions of seedling growth, fresh weight and water content were greater under alkali stress. The Na＋ concentration, Na＋/K＋ ratio increased, but K＋ concentration decreased Under both stresses, and the changes were greater under alkali stress. Under salt stress, shoots mainly accumulated C1- and iittle change was found in organic acids. While under alkali stress, the concentrations of C1- ,NO;- and H2PO;- were all decreased, and organic acids accumulated. In addition, proline and soluble sugars were both accumulated under salt and alkali stresses, but the increment was greater under alkali stress. Thus, alkali stress inhibited early seedlings of Leymus chinensis much greater because of the high pH, different accumulation characters of Cl- and organic acids indicated that different adaptive mechanisms to salt and alkali stresses existed in early seedling stage.

关 键 词：盐胁迫 碱胁迫 羊草 幼苗 生理响应 有机酸 

分 类 号：Q945.78[生物学—植物学]