氯化钠胁迫对2个中山杉无性系生长及离子吸收运输的影响  

Salt(NaCl) stress on growth,ion uptake,and transport of(Taxodium distichum×T. mucronatum) × T. mucronatum 'Zhongshansha' breeding clones

作　　者：马海燕[1] 林松明[1] 徐迎春[1] 李永荣[2] 陈永辉[2] 

机构地区：[1]南京农业大学园艺学院,江苏南京210095 [2]江苏省中国科学院植物研究所(南京中山植物园),江苏南京210014

出　　处：《浙江林学院学报》2008年第3期319-323,共5页Journal of Zhejiang Forestry College

基　　金：江苏省农业三项工程资助项目(SX2004-078)

摘　　要：采用水培试验,比较研究了氯化钠胁迫对2个中山杉(Taxodium distichum×T.mucronatum)×T.mucronatum‘Zhongshansha’无性系146号(耐盐性较强)和24号(耐盐性较弱)生长及离子吸收运输的影响。结果表明:与对照相比,氯化钠胁迫下2个中山杉无性系总干质量和地上部干质量均显著降低,24号根部干质量显著降低,而146号仅在较高质量浓度(4.0,4.5 g.L-1)处理时才显著降低;146号根冠比在低质量浓度(3.5 g.L-1)氯化钠处理时,增加幅度远远大于24号。146号苗高相对生长量在氯化钠低质量浓度(3.0,3.5 g.L-1)时随盐质量浓度的增加下降幅度很大,但当氯化钠高质量浓度时却下降缓慢;而24号与之相反。氯化钠处理下,146号与24号相比,根部对K+的选择性较强,且叶片积累较少的Na+以及叶片维持较低的Na+/K+比率,是146号具有较强耐盐力的重要原因。Growth, ion uptake, and transport of two （Taxodium distichum ×T. mucronatum） × T. mucronatum ＇Zhongshansha＇ breeding clones, No. 146 （with relatively strong salt resistance） and No. 24 （ with relatively weak salt resistance） , were compared under hydroponic culture conditions. A pot experiment design with treatments of clones （ No. 24 and No. 146） , NaCl concentrations of （3.0, 3.5,4. 0, and 4. 5 g· L^- 1 with a control of 0 g· L^- 1 ）, and five replication. Results indicated that compared with the control, total dry mass and aboveground weights of the two T. ＇ Zhongshansa＇ breeding clones treated with NaCl decreased. Other results included ： 1 ） root dry mass of No. 24 decreased significantly （P 〈 0. 05 ） at all concentrations, while No. 146 decreased significantly （P〈0.05）at higher concentrations （4.0 and 4.5 g· L^- 1）; 2） compared with the control, the root-shoot ratio increment of No. 146 treated with NaCl at lower concentrations （3.5 g· L^- 1） was larger than No. 24; 3） relative growth of No. 146 decreased at lower concentrations （3.0 and 3.5 g· L^- 1 ） , but not as much as at high concentrations ; and the relative growth of No. 24 was opposite of No. 146. In treatments with NaC1, root selectivity toward K ＋ of No. 146 was stronger significantly （P〈0.05） than that of No. 24, whereas Na＋ in leaves and the Na＋/K＋ value of No. 146 were lower significantly （ P 〈 0.05 ） than No. 24. These results with K ＋ were important reasons why clone No. 146 had a stronger salt resistance.

关 键 词：植物学 氯化钠胁迫 中山杉 生长 离子吸收运输 

分 类 号：S718.43[农业科学—林学]