丛枝菌根利用氮素研究进展

氮素是植物需求量最大的元素,丛枝菌根真菌与植物形成共生体后能从土壤中获取无机氮、简单的氨基酸,还能利用一些复杂的有机态氮.考虑到NH+4在土壤中的移动性低及丛枝菌根真菌的专性共生菌的特点,丛枝菌根真菌吸收NH+4对植物的贡献较大.近年来的研究发现丛枝菌根真菌内存在与氮素代谢有关的鸟氨酸循环,而精氨酸则是菌丝内氮素转移的主要形式.综述最近的AMF对氮素的吸收、转运、同化、交换等方面的文献,旨在揭示丛枝菌根真菌氮素利用特点,阐明丛枝菌根真菌在氮循环系统中的重要作用.

Review of researches on nitrogen utilized by arbuscular mycorrhiza

Nitrogen, as the most demands of nutrient element for plants, can be uptake by the symbiosis of arbuscular mycorrhizal fungus (AMF) and host plant with different forms, such as inorganic nitrogen, simple amino acid, even some complicated organic nitrogen and so on. Since the NH+4 expresses low mobility in soil and AMF belongs to the obligate fungi, it can be accounted that AMF possess the major contribution for host plant about NH+4 uptake. Some recent researches showed the existing of ornithine cycle related to nitrogen transport in AMF, and the arginine may take the mostly nitrogen transfer role in the AMF hypha. In this article, we attempt to outline the mechanism of nitrogen metabolism such as uptake, transport, assimilation and exchange in AMF, and focus on the characteristic of AMF nitrogen utilization. Forthmore, we hope to elucidate why AMF take an important role in nitrogen cycle of the ecosystem.