RELATIONSHIPS BETWEEN MYCORRHIZAS AND ANTIOXIDANT ENZYMES IN CITRUS (CITRUS TANGERINA) SEEDLINGS INOCULATED WITH GLOMUS MOSSEAE

摘要

A potted experiment was conducted to evaluate the effects of an arbuscular mycorrhizal fungus (AMF), Glomusmosseae, on growth performance and superoxide dismutase (SOD) and catalase (CAT) activities of citrus (Citrus tangerina)seedlings. After five months of AMF inoculation, mycorrhizal colonization and vesicles, but not arbuscules and entry points,increased with the increase of inoculated mycorrhizal dosages among 5 40 g (32 spores/g dosage). Mycorrhizal inoculationwith 10 40 g dosages significantly increased plant growth traits, including plant height, stem diameter, and shoot, root andtotal fresh weights. Higher leaf chlorophyll content was found in all the mycorrhizal plants, compared with the nonmycorrhizalplants. Inoculation with G. mosseae markedly decreased SOD and CAT activities of leaf and root, except anincrease of either root CAT with the 20 g mycorrhizal treatment or root SOD with the 20 and 40 g mycorrhizal treatments. Inaddition, mycorrhizal colonization and vesicles significantly positively correlated with root SOD and without root CAT. Wealso discussed the relationships between mycorrhizal effects on antioxidant enzymes and growth environment of host plants.