[高盐胁迫对罗布麻生长及离子稳态的影响]

[Impact of high salt stress on Apocynum venetum growth and ionic homeostasis].

作者信息

Ning Jian-Feng, Zheng Qing-Song, Yang Shao-Hai, Zou Xian-Zhong, Sun Li-Li, Chen Yong

机构信息

Guangdong Province Key Laboratory of Nutrient Cycling and Farmland Conservation, Soil and Fertilizer Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China.

出版信息

Ying Yong Sheng Tai Xue Bao. 2010 Feb;21(2):325-30.

PMID:20462001

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 x 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 x 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 x L(-1) NaCl stress, but decreased significantly under 300-400 mmol x 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 the higher selective absorption and transportation of K+ and Ca2+ were the key adaptive mechanisms of high salt-tolerance of A. venetum.

摘要

在网室中进行了盆栽试验，以研究用不同浓度（100 - 400 mmol·L⁻¹）的NaCl处理30天的罗布麻的生长响应及相关机制。测定了生物量积累、生长速率、根系活力、盐离子含量以及矿质离子的吸收和分配情况。与对照相比，100 mmol·L⁻¹ NaCl处理对植株干质量影响较小，但显著降低了植株鲜质量和生长速率。随着培养基中NaCl浓度的增加，植株干质量、鲜质量和生长速率均显著下降。在100和200 mmol·L⁻¹ NaCl胁迫下，植株根系活力明显较高，但在300 - 400 mmol·L⁻¹ NaCl胁迫下显著降低。随着培养基中NaCl浓度的增加，罗布麻根、茎、叶中的Na⁺含量逐渐增加，而K⁺含量缓慢下降，叶中的Ca²⁺和Mg²⁺含量明显降低，茎中的Ca²⁺含量和根中的Mg²⁺含量不同程度增加。在NaCl胁迫下，根、茎、叶中的K⁺/Na⁺、Ca²⁺/Na⁺和Mg²⁺/Na⁺比值显著降低，而K⁺和Ca²⁺的选择性吸收和运输显著增加。较强的排盐能力以及对K⁺和Ca²⁺较高的选择性吸收和运输是罗布麻高耐盐性的关键适应机制。