NaCl胁迫对酸枣幼苗离子吸收与分配的影响  

Effects of NaCl Stress on Ion Absorption and Distribution in Sour Jujube Seedlings

作　　者：靳娟[1] 王依[1] 鲁晓燕[1] 林海荣[1] 崔辉梅[1] 

机构地区：[1]石河子大学农学院特色果蔬栽培生理与种质资源利用兵团重点实验室,新疆石河子832000

出　　处：《园艺学报》2015年第5期853-862,共10页Acta Horticulturae Sinica

基　　金：国家自然科学基金项目(31460057);石河子大学博士基金项目(RCZX200908)

摘　　要：以酸枣水培幼苗为试验材料,研究了不同浓度NaCl胁迫对其活性氧、细胞膜透性、根系活力、不同器官Na+、K+、Ca2+和Mg2+离子含量的影响。结果表明:NaCl处理6 d,50、100 mmol·L-1处理酸枣叶片无萎蔫症状,150、200 mmol·L-1处理叶片萎蔫。在150、200 mmol·L-1 NaCl处理下叶片H2O2积累增加,50、100、150、200 mmol·L-1 NaCl处理下均有积累。随着NaCl处理浓度的升高,根、茎、叶中Na+含量均显著增加,叶片中K+、Ca2+和Mg2+含量显著下降,根和茎的K+和Mg2+含量变化不显著,Ca2+在200 mmol·L-1NaCl处理下显著下降。根、茎、叶中K+/Na+、Ca2+/Na+、Mg2+/Na+均显著下降,但是根的K+/Na+值始终大于1。总之,NaCl胁迫下,维持根和茎中相对稳定的K+、Mg2+水平、保持根部K+/Na+比值>1,是酸枣幼苗对盐胁迫的一种适应。A hydroponic experiment was conducted to study the effects of NaCl concentration on reactive oxygen species,cell membrane permeability,root activity,and the concentrations of Na+,K+,Ca2+,and Mg2+ in different organs of sour jujube seedlings. The results showed no leaf wilting after six days in either 50 or 100 mmol · L-1 NaCl treatments. In contrast,leaf wilting was observed in both the 150 and 200 mmol · L-1 NaCl treatments. Leaf H2O2 concentrations were significantly greater in both the 150 and 200 mmol · L-1 NaCl treatments than in the 0 mmol · L-1 NaCl(control)treatment. Leaf concentrations were significantly greater in the NaCl treatments(i.e.,50,100,150,200 mmol · L-1 NaCl)than in the control treatment. The NaCl treatments significantly increased Na+ concentrations in roots,stems,and leaves. In contrast,the NaCl treatments significantly reduced K+,Ca2+,Mg2+ concentrations in leaves. The NaCl treatments had no significant effect on K+ and Mg2+ concentrations,regardless of the plant organ. Compared with the control,the 200 mmol · L-1 NaCl treatment significantly reduced Ca2+ concentrations in roots and stems. The NaCl treatments significantly reduced the K+/Na+,Ca2+/Na+,and Mg2+/Na+ ratios of roots,stems and leaves;However,the K+/Na+ ratio of roots was always greater than 1. In conclusion,in order to adapt to salt stress,sour jujube seedlings not only maintained relative stable K+and Mg2+ concentrations in roots and stems,but also maintained a K+/Na+ ratio > 1 in roots.

关 键 词：酸枣 NACL胁迫 矿质离子 吸收与分配 

分 类 号：S665.1[农业科学—果树学]