NaCl胁迫对3个彩色树种的盐害及Na^+,K^+,Ca^2+器官分布的影响  

Effect of NaCl Stress on Injury and Na^+,K^+ and Ca^2+ Distribution in Three Color-leaved Tree Species

作　　者：杨升[1] 王金旺[1] 刘星 李效文[1] 潘凤跃[1] 陈秋夏[1] YANG Sheng;WANG Jin-wang;LIU Xing;LI Xiao-wen;PAN Feng-yue;CHEN Qiu-xia(Zhejiang Institute of Subtropical Crops,Wenzhou 325005,China)

机构地区：[1]浙江省亚热带作物研究所,浙江温州325005

出　　处：《浙江林业科技》2019年第6期25-31,共7页Journal of Zhejiang Forestry Science and Technology

基　　金：中央财政林业科技推广示范项目“楠溪江彩叶健康林营建技术推广与示范”(2016-TS-08);院院合作项目“海涂围垦区生态修复及耐盐桑树品种选育”(10102000316LL0005F);所科研启动基金项目“耐盐碱彩色树种选育及快繁技术研究”(2014Y001)。

摘　　要：为了研究彩色树种在NaCl胁迫下矿质离子的响应机制,采用0,85,170,340,510 mmol·L^-1五种不同浓度NaCl溶液对金叶复叶槭Acer negundo‘Aurea’,紫叶合欢Albizia spp.和金叶皂荚Gleditsia triacaanthos‘Sunburst’2年生苗进行胁迫处理,50天后,根据其表型评判各树种盐害等级,并测定其根、茎和叶中Na^+,K^+,Ca^2+含量,计算各组织的K^+/Na^+和Ca^2+/Na^+值。结果表明,在340 mmol·L^-1 NaCl浓度下,金叶复叶槭绝大部分叶片边缘焦枯,盐害等级为3,紫叶合欢和金叶皂荚部分叶片焦枯,盐害等级为2,而510 mmol·L^- 1NaCl浓度下,紫叶合欢盐害等级为4级,而金叶皂荚的盐害等级为3级;3个树种根、茎和叶中Na^+含量均随着盐浓度增加而增加,而K^+含量和K^+/Na^+均显著下降(P<0.05),并且金叶皂荚降幅少于金叶复叶槭和紫叶合欢;Ca^2+含量均随着盐浓度增加呈下降趋势,根和叶的Ca^2+/Na^+在金叶皂荚中的降幅小于金叶复叶槭和紫叶合欢。因此,在NaCl胁迫下,金叶皂荚盐害等级低,归因于其具有较强的拒Na^+和保留K^+,Ca^2+能力,从而维持体内K^+/Na^+,Ca^2+/Na^+平衡。Experiments were carried out on NaCl stress with 0,85,170,340,510 mmol·L-1on 3-year color-leaved tree species namely Acer negundo‘Aurea’,Albizia spp.,Gleditsia triacanthos‘Sunburst’in 2016.Content of Na^+,K^+,Ca^2+,value of K^+/Na^+,Ca^2+/Na+of root,stem and leaf and injuries of treated seedlings were measured 50 days later.The results demonstrated that A.negundo‘Aurea’showed injury of class 3,A.spp.and G.triacanthos‘Sunburst’class 2 under treatment of 340 mmol·L^-1 NaCl,while under treatment of 510 mmol·L^-1 NaCl,A.negundo‘Aurea’and A.spp.class 4,G.triacanthos‘Sunburst’class 3.The content of Na+in the tested organs of three species increased with NaCl concentration,but the content of K+and value of K^+/Na^+ decreased significantly.The content of Ca^2+ had negative relation with the increase of NaCl concentration,and Ca^2+/Na^+ of G.triacanthos‘Sunburst’in root and leaf showed less decline.The experiment resulted that salt damage of G.tricanthos‘Sunburst’was the lowest under NaCl stress.

关 键 词：彩色树种 耐盐性 NACL胁迫 离子平衡 

分 类 号：S713[农业科学—林学]