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| 高盐胁迫对罗布麻生长及离子平衡的影响 | |
| 引用本文： | 宁建凤,郑青松,杨少海,邹献中,孙丽丽,陈勇.高盐胁迫对罗布麻生长及离子平衡的影响[J].应用生态学报,2010,21(2):325-330. |
| 作者姓名： | 宁建凤 郑青松 杨少海 邹献中 孙丽丽 陈勇 |
| 作者单位： | 1. 广东省农业科学院土壤肥料研究所广东省养分资源循环利用与耕地保育重点实验室,广州,510640 2. 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试验室,南京,210095 |
| 基金项目： | 广东省养分资源循环利用与耕地保育重点实验室项目; 广东省农业科学院土壤肥料研究所所长基金项目(2007-SZJJ-02)资助 |
| 摘 要： | 采用网室盆栽试验,研究了不同浓度NaCl(100～400mmol.L-1)胁迫30d对罗布麻植株生物量积累、生长速率、根系活力、盐分和矿质离子吸收、分布等的影响.结果表明:100mmol.L-1NaCl处理30d,罗布麻植株鲜质量和生长速率显著下降,但对其干质量没有影响;随着盐度的增加,罗布麻植株干质量、鲜质量和生长速率均显著降低.100～200mmol.L-1NaCl胁迫下,罗布麻根系活力明显高于对照;300～400mmol.L-1NaCl盐胁迫下,其活力显著降低.随着盐浓度的增加,罗布麻根、茎和叶片Na+含量逐渐增加、K+含量缓慢降低;叶片Ca2+、Mg2+含量明显降低,茎部Ca2+和根部Mg2+含量有不同程度的增加.盐胁迫明显降低了罗布麻根、茎和叶片K+/Na+、Ca2+/Na+和Mg2+/Na+的比率,植株选择性吸收和运输K+、Ca2+的能力显著提高.罗布麻植株很强的拒盐能力,以及对K+、Ca2+的选择性吸收和运输是其具有高盐适应性的主要原因. |
| 关 键 词： | 盐胁迫 罗布麻 生物量 离子平衡 离子选择性吸收和运输 |
Impact of high salt stress on Apocynum venetum growth and ionic homeostasis |
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| NING Jian-feng,ZHENG Qing-song,YANG Shao-hai,ZOU Xian-zhong,SUN Li-li,CHEN Yong.Impact of high salt stress on Apocynum venetum growth and ionic homeostasis[J].Chinese Journal of Applied Ecology,2010,21(2):325-330. | |
| Authors: | NING Jian-feng ZHENG Qing-song YANG Shao-hai ZOU Xian-zhong SUN Li-li CHEN Yong |
| Affiliation: | Guangdong Province Key Laboratory of Nutrient Cycling and Farmland Conservation, Soil and Fertilizer Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;Jiangsu Province Key Laboratory of Marine Biology, College of Natural Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China |
| Abstract: | A pot experiment was conducted in a net room to study the growth responses and related mechanisms of Apocynum venetum treated with different concentrations (100-400 mmol·L-1) of NaCl for 30 days. The biomass accumulation, growth rate, root vigor, salt ion content and mineral ion uptake and distribution were measured. Compared with the control, treatment 100 mmol·L-1 NaCl had lesser effects on the plant dry mass, but decreased the plant fresh mass and growth rate significantly. With increasing NaCl concentration in the medium, the plant dry mass, fresh mass, and growth rate all decreased significantly. The plant root vigor was obviously higher under 100 and 200 mmol·L-1 NaCl stress, but decreased significantly under 300-400 mmol·L-1 NaCl stress. With the increase of NaCl concentration in the medium, the Na+ content in A. venetum roots, stems and leaves increased gradually while the K+ content had a slow decrease, the Ca2+ and Mg2+contents in leaves decreased obviously, and the Ca2+ content in stems and the Mg2+ content in roots increased in different degree. Under NaCl stress, the K+/Na+, Ca2+/Na+, and Mg2+/Na+ ratios in roots, stems, and leaves decreased markedly, while the selective absorption and transportation of K+ and Ca2+ increased significantly. The stronger ability of salt exclusion and zhe higher selective absorption and transportation of K+ and Ca2+ were the key adaptive mechanisms of high salt-tolerance of A. venetum. |
| Keywords: | salt stress Apocynum venetum biomass ionic homeostasis ionic selective absorption and transportation |
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