Arbuscular mycorrhizal colonization of semi-aquatic grasses along a wide hydrologic gradient.

摘要: The effect of soil flooding on arbuscular-mycorrhizal (AM) fungal colonization wetland plants was investigated using Panicum hemitomon and Leersia hexandra, two semi-aquatic grasses (Graminaceae) that grow along a wide hydrologic gradient in Carolina bay wetlands the southeastern US coastal plain. Three related investigations were conducted dry-to-wet these wetlands; field survey AM root eight wetlands, monthly monitoring patterns P. over growing season, an inoculum potential bioassay soils collected gradient. showed strongly negatively correlated with water depth, but present most samples. assessment indicated lowest plots consistently wet rose as some underwent seasonal drying. assay dry, intermediate, performed under both dry saturated conditions for >1 yr had same ability to form mycorrhizas bait those remained dry. These findings suggested lower degree areas observed because presence surface rather than low numbers mycorrhizal propagules soil. Overall, results show is partially not totally inhibitory grasses.