钦州湾红树林丛枝菌根初步研究

Primary study on arbuscular mycorrhizas of mangrove in Qinzhou Bay

海漆 (Excoecaria agallocha)、桐花树 (Aegiceras corniculatum)、秋茄 (Kandlia candel)、白骨壤 (Avi-cennia marina)是钦州湾分布广、生长量大的 4种红树植物 ,该项研究初步调查了丛枝菌根真菌在这四种植物根系的定居情况。在这四种植物的根际土壤均分离到丛枝菌根真菌孢子 ,其孢子密度以海漆根际的最高 ,其次为桐花树、秋茄、白骨壤。同时 ,海漆根系的侵染率和物种丰富度也最高 ,但在所取的白骨壤根样中没有观察到丛枝菌根的侵染。菌根侵染主要是以根内菌丝、胞内菌丝膨大扭曲、泡囊等形态出现。海水和土壤质地是影响菌根侵染率的主要因素。在所采土样中仅发现球囊霉属 (Glomus)、无梗囊霉属 (Acaulospora)丛枝菌根真菌 ,计有 1 7种和多个未确定种。

Colonization of the arbuscular mycorrhizal fungi (AMF) on root system of four mangrove plants in Qinzhou Bay was surveyed. The AMF spores density in soil of different plant rhizosphere and the intensity of AMF infection were analyzed. Excoecaria agallocha possessed the highest spore density,infection intensity,and species richness of AMF,and Aegiceras corniculatum,Kandlia candel,Avicennia marina rank in turns. AM structures were not found in the root samples of Avicennia marina. Curled and expanded intracellular hyphae,vesicles,and intercellular hyphae were the most discernible AM structures. Saline and soil character were the main factors that influenced the AMF infection of mangrove. Seventeen AMF were isolated and belong to the genera of Glomus and Acaulospora.