生长,生物资源和离子关系上的 NaCl 的效果二盐容忍 Paxillus 孤立 involutus, MAJ 和 NAU 被调查。二 Paxillus 紧张暴露于 NaCl 的下列集中:0, 100, 200 和 500 mmol · L −1 。MAJ 和 NAU 的生长被 100 mmol · L −1 NaCl 提高,但是严重地在 500 mmol · L −1 的集中禁止了。NAU 展出了一个更大的能力在所有咸度层次下面排除 Na + 和 Cl − ,而盐包括 MAJ 在盐应力下面在滋养的举起有一个更高的能力。在对待 NaCl 的 MAJ 和 NAU 的比率 Na +/K+, Na +/Ca2+ 和 Na +/Mg2+ 没在 100 和 200 mmol · L −1 NaCl,但是显著地的层次增加在 500 点增加了 mmol · L −1 。这建议二拉紧,特别 MAJ,相应于在中等咸度的增加的 Na + 流入的提高的滋养的举起。我们断定 MAJ 和 NAU 能容忍 500 mmol · L −1 NaCl 但是在在二 Paxillus 紧张保留离子的动态平衡有种类特定的差别。NAU 是盐排除, MAJ 是盐包括,但是在盐的条件下面在滋养的选择保留一个高能力。他们提高 mycorrhizal 主人的盐忍耐的明确的机制需要推进学习。
The effect of NaCl on growth, biomass and ion relations of two salt-tolerant isolates of Paxillus involutus, MAJ and NAU were investigated. The two Paxillus strains were exposed to the following concentrations of NaCl: 0, 100, 200 and 500 mmol·L^-1. Growth of MAJ and NAU was enhanced by 100 mmol·L^-1 NaCl but severely inhibited at the concentration of 500 mmol·L^-1. NAU exhibited a greater capacity to exclude Na^+ and Cl^- under all salinity levels, whereas the salt-includer MAJ had a higher capacity in nutrient uptake under salt stress. The ratios Na^+/K^+, Na^+/Ca^2+ and Na^+/Mg^2+ in NaCl-treated MAJ and NAU did not increase at levels of 100 and 200 mmol·L^-1 NaCl but markedly increased at 500 mmol·L^-1. This suggests that the two strains, especially MAJ, enhanced nutrient uptake corresponding to the increased Na^+ influx at moderate salinity. We conclude that both MAJ and NAU are able to tolerate 500 mmol·L^-1 NaCl but there are species-specific differences in retaining ionic homeostasis in the two Paxillus strains. NAU is a salt-excluder, MAJ is a salt-includer but retains a high capacity in nutrient selectivity under saline conditions. Their definite mechanisms to enhance salt tolerance of mycorrhizal hosts need further study.