盐胁迫下VA菌根真菌对无芒雀麦体内矿质元素含量及组成的影响

Influence of VAM Fungi on Mineral Elements Concentration and Composition in Bromus inermis under Salinity Stress

盆栽条件下研究了不同ＮａＣｌ水平、ＶＡＭ真菌对无芒雀麦（Ｂｒｏｍｕｓｉｎｅｒｍｉｓ）生长和矿质元素吸收的影响。结果表明：在土壤中加入ＮａＣｌ量为０、１、２、３ｇ／ｋｇ条件下，随着ＮａＣｌ水平提高，植株生物产量降低。在同一ＮａＣｌ水平下，接种ＶＡＭ真菌处理的生物产量显著高于对照；而且随着ＮａＣｌ水平提高，无芒雀麦对ＶＡＭ真菌的依赖性也呈增加趋势，说明盐胁迫下ＶＡＭ真菌对无芒雀麦生长的促进作用增大。与不接种处理相比，在ＮａＣｌ胁迫下接种ＶＡＭ真菌根处理的植株磷含量提高，钠含量和Ｎａ／Ｋ、Ｎａ／Ｃａ、Ｎａ／Ｐ、Ｃｌ／Ｐ元素间的含量比例降低；在ＮａＣｌ水平较高时（大于２ｇ／ｋｇ）接种ＶＡＭ真菌还显著增加了植株体内Ｎ和Ｋ的含量。上述结果说明，ＶＡＭ真菌提高无芒雀麦耐盐性的原因与其改善植株营养条件（如Ｎ、Ｐ等）、降低Ｎａ、Ｃｌ在植株体内的相对含量有关。

The influence of vesicular-arbuscular mycorrhizal fungi on the growth of and mineral elements accumulation in Bromus inermis under salt-caused stress conditions was studied at the levels of 0,1,2,3 g/kg NaCl added to the soil for the potted plant. It was shown that the biomass of the plant declined with an increased NaCl level, and, at a given NaCl level, the biomass of the individuals inoculated with VAM fungi was higher than that of the individuals without the inoculation treatment. The result indicated that VAM fungi had a promoting effect on the growth of the plant under salt-caused stress, and it seemed more so with an increased degree of the stress. It was also observed that the content of P in the plant under NaCl stress was increased by VAM fungi, while the content of Na and the ratios of Na/K, Na/Ca, Na/P and Cl/P were decreased. At a high NaCl level (>2 g/kg) VAM fungi significantly increased the contents of N and K in the plant. It could be concluded that the mechanism of VAM fungi in improving the salt tolerance of Bromus inermis was in that the fungi can improve the nutritional condition of the plant by increasing the contents of N and P while decreasing the relative concentration of Na and Cl in the plant.