[Ectomycorrhizal fungi enhance salt tolerance of by regulating ion balance].

We explored the effects of salt stress on the growth of and the effects of ectomycorrhizal fungi (ECMF) on the ion balance of . After inoculating four kinds of ECMFs (, , , ) on seedlings, we treated the annual non-mycorrhizated and mycorrhizated seedlings with NaCl stress (0, 100, 200, 300 mmol·L) for 36 days, and then analyzed the mycorrhizal characteristics, growth, leaf injury symptoms, leaf electrolyte permeability, water content, and ion contents in roots, stems, and leaves. The results showed that the four ECMFs could establish a symbiotic system with , and that root system of mycorrhizal seedlings was stronger than that of non-mycorrhizal seedlings. Under salt stress, the growth of seedlings was inhibited, with the symptoms of scorched leaves. The damage to leaf plasma membrane and the degree of water loss were aggravated with the increases of salt stress. Under low salt stress (100 mmol·L), preferentially accumulated Na in roots and stems. Under medium-high salt stress (200-300 mmol·L), roots became the primary organ for accumulating Na. ECMF regulated ion balance in plant by increasing the Na level in roots and reducing the Na accumulation in stems and leaves, enhancing the absorption of K and Ca to increase the K/Na and Ca/Na. The four ECMFs had different mitigation effects on salt poisoning of . had the strongest effect, followed by , while and had relatively little effect.