小连翘内生真菌种群分布及其抗菌性研究

Studies on communities of endophytic fungi from Hyperioums sampsonii Hance and their antipathogenic activities in vitro

目的分析小连翘(Hyperioums sampsonii Hance)内生真菌的分布特征和抗菌活性。方法采用内生菌分离法分离菌株,双培养法对峙试验测定其抗菌性。结果从小连翘的根、茎、叶等不同的器官中分离得到81株内生真菌,经形态学分类鉴定分属于4个目,5个科,26个属,其中头孢霉属(Cephalosporium sp.)和丝核菌属(Rhizoctonia sp.)为优势菌群。不同部位内生真菌的类型、数量和分布存在差异,根部有31株,分属于12属;茎部有12株,分属于10属;叶部有38株,分属于13属。通过平板对峙实验发现,从小连翘所分离的内生真菌中54.32%对某些植物病原真菌有拮抗活性。结论小连翘内生真菌及其代谢产物中具有潜在活性物质,值得深入研究。

The endophytic fungi were isolated and identified morphologically from the roots, stems and leaves of Hyperioums Sampsonii Hance. Eighty-one strains of endophytic fungi were isolated and belonged to 26 genera, 5 families and 4 orders. Cephalosporium sp. and Rhizoctonia sp. were the dominant genera. Among 81 strains, 31 strains of 12 genera were isolated in roots, 12 strains of 10 genera in stems, and 38 strains of 13 genera in leaves. The results showed that the quantity, population, and distribution of the endophytic fungi varied in different positions of Hyperioums Sampsonii Hance. In the dual culture tests, 53.48% of all the isolated Endophytie fungi showed antagonistic to some plant pathogens. These endophytic fungi inside the plants have intimate correlation with their hosts. These endophytic fungi and their metabolites might play an important role in the plants against the pathogens.