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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.
Pot experiments were conducted to study the effects of different concentrations of NaCl (100-400mmol.L-1) on the biomass accumulation, growth rate, root vigor, salt and mineral ion absorption and distribution of Apocynum plant.Results showed that: 100 mmol.L-1NaCl for 30 days, the fresh weight and growth rate of Apocynum venetum reduced significantly, but had no effect on its dry weight. With the increase of salinity, the dry weight, fresh weight and growth rate of Apocynum venetum reduced significantly Under the stress of ~ 200mmol.L-1NaCl, the root activity of Apocynum venetum L. was significantly higher than that of the control; Under the salt stress of 300-400mmol.L-1NaCl, its vitality decreased significantly.With the increase of salt concentration, the Na + content of Apocynum venetum root, stem and leaf While K + content decreased slowly. The content of Ca2 + and Mg2 + in leaves and the contents of Mg2 + in roots and stems increased with the increase of salt stress, but K + / Na +, Ca2 + / Na + and Mg2 + / Na +, the ability of plants to selectively absorb and transport K + and Ca2 + was significantly increased.The strong salt rejection ability and the selective absorption and transport of K + and Ca2 + were the main reasons for its high salt adaptability .