【摘要】 用不同浓度的 Na Cl溶液处理滨藜 (Atriplex undulata)植株后发现 :1 0 0 mmol/LNa Cl促进滨藜地上部及根部生物量积累 ,高于 1 0 0 mmol/L Na Cl时 ,抑制其生长。各部位的Na+ 和 Cl- 含量随着 Na Cl浓度的升高明显增加。Na Cl处理下 ,叶片的 Na+ 和 Cl- 含量高于根部 ,幼叶高于老叶 ,且叶片的 K+ (除 5 0 0 mol/L Na Cl处理的老叶外 ) ,根部的 K+、Ca2 +和NO- 3 无显著变化。叶片的 Na/K比随 Na Cl浓度的升高而增加 ,但较高浓度时下降 (在老叶中 )或维持稳定 (在幼叶中 )。随着处理浓度的增加 ,各部位对 K+ 的选择性 (相对于 Na+ )增加 ,渗透调节能力增强 ,渗透势降低。另外 ,还讨论了滨藜对盐渍生境的适应特征。更多还原

【Abstract】 Atriplex undulata were treated with different concentrations of NaCl solutions. The results were as follows: The biomass of shoots and roots was enhanced by the treatment of 100 mmol/L NaCl solutions., but it was inhibi- ted by higher NaCl concentrations.The Na + and Cl - contents of different parts increased evidently with increasing NaCl concentrations; those in leaves higher than those in roots, and those in young leaves higher than those in old leaves under NaCl treatments. No significant changes in the contents of K + in leaves (except old leaves treated with 500 mmol/L NaCl) and K +, Ca 2+ and NO - 3 in roots were found. Na/K ratios in leaves increased with increasing NaCl concentrations under lower salt concentrations (0～300 mmol/L NaCl) , but they decreased ( in old leaves) or remained relatively stable ( in young leaves ) under higher salt concentrations (400～500 mmol/L NaCl). The selectivity of K + over Na + and the ability of osmotic adjustment dramatically increased while osmotic potential decreased with increasing NaCl concentrations. Furthermore, the characterized adaptability to diffrent salt environments of Atriplex undulata was discussed.更多还原