NaCl胁迫对2个杨树品系扦插苗生长及体内离子含量和运输的影响  

Effect of NaCl stress on growth and ion content and transport in cutting seedling of two lines of Populus spp.

作　　者：武传兰[1] 隆小华[1] 梁明祥[1] 王长海[1] 刘兆普[1] 

机构地区：[1]南京农业大学资源与环境科学学院江苏省海洋生物学重点实验室,江苏南京210095

出　　处：《植物资源与环境学报》2013年第1期63-69,共7页Journal of Plant Resources and Environment

基　　金：国家公益性行业(农业)科研专项经费项目(200903001-05);国家"十二五"科技支撑计划项目(2011BAD13B09);江苏省科技支撑计划项目(BE2010305;BE2011368)

摘　　要：以杨树(Populus spp.)品系"南杨1号"(Nanyang No.1)和"南杨2号"(Nanyang No.2)为实验材料,研究了不同浓度(0、75和150 mmol.L-1)NaCl胁迫条件下2个杨树品系扦插苗生长及不同器官中离子(N、P、K+、Na+、Ca2+、Mg2+和Cl-)含量与运输的差异。结果表明:随NaCl浓度的提高,2个杨树品系的单株干质量以及"南杨1号"的根冠比均逐渐降低,但"南杨2号"的根冠比呈现先增大后减小的趋势;除P和Mg2+含量外,2个品系根、新生枝条和叶片中营养元素的含量均逐渐降低,Na+和Cl-含量以及Na+/K+和Na+/Ca2+比值均逐渐增加,但Na+和Cl-含量以及Na+/K+和Na+/Ca2+比值的增幅在根中均最高、在叶片中均最小。在150 mmol.L-1NaCl胁迫条件下,2个品系的单株干质量和根冠比以及根、新生枝条和叶片中N、P、K+、Ca2+和Mg2+含量均最低,Na+和Cl-含量以及Na+/K+和Na+/Ca2+比值均最高,且与对照有显著差异。在NaCl胁迫条件下,2个品系从根到新生枝条、从新生枝条到叶片的离子运输相对选择性比率RSK+,Na+和RSCa2+,Na+基本上均小于对照,其中,从根到新生枝条的RSK+,Na+和RSCa2+,Na+均大于从新生枝条到叶片。总体上看,在NaCl胁迫条件下"南杨2号"的单株干质量和根冠比、各器官的N和P含量、不同器官间的RSK+,Na+和RSCa2+,Na+均高于"南杨1号","南杨2号"各器官的Na+和Cl-含量以及Na+/K+和Na+/Ca2+比值的增幅均低于"南杨1号"。综合分析结果表明:NaCl胁迫对2个杨树品系扦插苗的生长及体内离子的分布及运输均有一定的影响,但总体上看,"南杨2号"对NaCl胁迫的耐性优于"南杨1号"。Taking two new lines of ＂Nanyang No. 1＂ and ＂Nanyang No. 2＂ of Populus spp. as the experimental materials, differences of growth and content and transport of ions （ N、P、K^＋、Na^＋、Ca^2＋、Mg^2＋ and Cl^-） in different organs of cutting seedlings of two lines were researched under NaC1 stress with different concentrations （0, 75 and 150 mmol·L^-1）. The results show that with rising of NaC1 concentrations, dry weight per plant of two lines and root-shoot ratio of ＂Nanyang No. 1＂ are gradually reducing, but root-shoot ratio of ＂ Nanyang No. 2＂ appears the trend of firstly increasing and then reducing; in root, new branch and leaf of two lines, contents of nutrient elements all are gradually decreasing except P and Mg^2＋, and contents of Na^＋ and C1^- and ratio values of Na^＋/K^＋ and Na^＋/Ca^2＋ are gradually increasing but their increasing ranges are the highest in root and the lowest in leaf. Under stress of 150 mmol·L^-1 NaC1, dry weight per plant and root-shoot ratio, contents of N, P, K^＋, Ca^2＋ and Mg^2＋ in root, new branch and leaf of two lines all are the lowest, and contents of Na^＋ and C1^- and ratio values of Na^＋/K^＋和 Na^＋/Ca^2＋ all are the highest with the significant difference compared to the control. Under NaC1 stress, the relative selectivity ratio RSK^＋,Na^＋ and RSCa^2＋,Na^＋ of ion transporting from root to new branch and from new branch to leaf of two lines almost are lower than those of the control, in which, RSK^＋,Na^＋ and RSCa^2＋,Na^＋ from root to new branch all are bigger than those from new branch to leaf. Generally, under NaC1 stress, dry weight per plant, root-shoot ratio, N and P contents, and RSK^＋,Na^＋ and RSCa^2＋,Na^＋ among different organs of ＂Nanyang No. 2＂ all are higher than those of ＂Nanyang No. 1 ＂, while increasing ranges of Na~ and C1- contents, ratio values of Na^＋/K^＋ and Na^＋/Ca^2＋ in different organs of ＂Nanyang No. 2＂ all are lower than those of ＂ Nanyang No. 1 �

关 键 词：NACL胁迫 杨树 根冠比 离子含量 离子运输 

分 类 号：Q946.91[生物学—植物学] Q945.78