前言微生物和植物有各种共生关系,这对植物生长是很重要的。豆目植物直接受共生根瘤菌的影响,使之无需依赖土壤氮素的供应而生长。许多树木的生长常依靠其根部形成菌根的真菌,扩大吸收表面积,从中吸取更多的水分和矿质营养,转化土壤有机质,提高土壤有效肥力,以供应共生树木的需要。与豆目植物共生的根瘤菌或与非豆目植物共生的放线菌,可在 Introduction Microbes and plants have various symbiotic relationships that are important for plant growth. The leguminous plants are directly affected by symbiotic rhizobia and grow without being dependent on soil nitrogen supply. Many trees often rely on their roots to form mycorrhizal fungi, expanding their surface area for absorption, extracting more water and mineral nutrients, transforming soil organic matter and increasing soil fertility to supply symbiotic trees. Rhizobia symbiotic with leguminous plants or actinomycetes that are symbiotic with non-leguminous plants