Increased Tolerance of Citrus (Citrus tangerina) Seedlings to Soil Water Deficit after Mycorrhizal Inoculation: Changes in Antioxidant Enzyme Defense System

摘要: Arbuscular mycorrhizal fungi (AMF) can enhance tolerance of plants to soil water deficit, whereas morphological observations reactive oxygen species and antioxidant enzyme system are poorly studied. The present study thereby evaluated temporal variations the in citrus (Citrus tangerina) seedlings colonized by Glomus etunicatum G. mosseae over a 12-day period drying. Root colonization decreased with drying days from 32.0 1.0% 50.1 4.5% 0-day 12-day, respectively. Compared non-AM controls, AMF had significantly lower tissue (both leaves roots) hydrogen peroxide (H2O2) superoxide anion radical (O2•–) concentrations during 1.03–1.92, 1.25–1.84 1.18–1.69 times higher activity dismutase, peroxidase (POD) catalase. In situ leaf H2O2 root POD location also showed that AM less but accumulation. Furthermore, infection enzymatic activities expressed than These results demonstrated AMs could confer greater deficit through an enhancement their defence whilst decrease level O2•–.