ROLE OF ARBUSCULAR MYCORRHIZAL FUNGI IN UPTAKE OF PHOSPHORUS AND NITROGEN FROM SOIL
ROLE OF ARBUSCULAR MYCORRHIZAL FUNGI IN UPTAKE OF PHOSPHORUS AND NITROGEN FROM SOIL
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DOI：
10.3109/07388559509147412
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发表时间：
1995-01-01
影响因子：
9
通讯作者：
JAKOBSEN, I
中科院分区：
文献类型：
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作者：
GEORGE, E;MARSCHNER, H;JAKOBSEN, I
丛枝菌根真菌对植物根系的定植可显著提高植物对磷、氮的吸收。丛枝菌根真菌对植物生长的最大贡献是由于根外菌丝吸收养分。通过使用根部和菌丝生长带分开的土箱，菌丝养分吸收的量化已经成为可能。许多(但不是全部)被测试的真菌菌株通过从土壤中吸收磷酸盐、铵和硝酸盐来增加植物对磷和氮的吸收。然而，与植物生长对养分的需求相比，丛枝菌根真菌对植物磷吸收的贡献通常要远远大于对植物氮素吸收的贡献。土壤养分的利用可能更多地依赖于土壤溶液中磷、硝酸盐和铵的有效吸收，即使在低供应浓度下也是如此，而不是依赖于氢磷的活化过程。与外生菌根真菌不同，丛枝菌根真菌菌丝只能在一定程度上利用土壤中的不溶营养源。菌根定植对植物健康或根系活力的副作用也可能影响植物的养分吸收。
Colonization of plant roots by arbuscular mycorrhizal fungi can greatly increase the plant uptake of phosphorus and nitrogen. The most prominent contribution of arbuscular mycorrhizal fungi to plant growth is due to uptake of nutrients by extraradical mycorrhizal hyphae. Quantification of hyphal nutrient uptake has become possible by the use of soil boxes with separated growing zones for roots and hyphae. Many (but not all) tested fungal isolates increased phosphorus and nitrogen uptake of the plant by absorbing phosphate, ammonium, and nitrate from soil. However, compared with the nutrient demand of the plant for growth, the contribution of arbuscular mycorrhizal fungi to plant phosphorus uptake is usually much larger than the contribution to plant nitrogen uptake. The utilization of soil nutrients may depend more on efficient uptake of phosphate, nitrate, and ammonium from the soil solution even at low supply concentrations than on mobilization processes in the hyphosphere. In contrast to ectomycorrhizal fungi, nonsoluble nutrient sources in soil are used only to a limited extent by hyphae of arbuscular mycorrhizal fungi. Side effects of mycorrhizal colonization on, for example, plant health or root activity may also influence plant nutrient uptake.