Arbuscular Mycorrhizal Fungus Affects the Photosynthetic Characteristics and Mineral Element Concentration of Blueberry Under Drought Stress

doi:10.11924/j.issn.1000-6850.casb18090109

Abstract

Abstract: For further clarifying the drought-resistant mechanism of blueberry improved by the arbuscular mycorrhizal (AM) fungus Glomus mosseae, a pot experiment was conducted to study the effects of AM fungus on the photosynthetic characteristics and mineral element concentrations in the leaves of southern highbush blueberry ‘O’ Neal’(Vaccinium corymbosum) under moderate drought stress. The results showed that moderate drought treatment significantly decreased the mycorrhizal colonization rate, net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), original light energy conversion efficiency of PSII (Fv/Fm), phosphorus (P), magnesium (Mg) and iron (Fe) concentration in the leaves of blueberry. Under moderate drought stress, AM inoculation significantly enhanced leaf chlorophyll and carotenoid concentrations, Pn, Tr, Gs, intercellular CO2 concentration (Ci), Fv/Fm, concentration of P, Mg and Fe, but it had no significant effect on potassium (K) and manganese (Mn) concentration in the leaves of blueberry. Thus, moderate drought stress treatment inhibits the rate of photosynthesis in blueberry mainly through the non-stomatal factors such as decreasing the light energy conversion efficiency of PSII. However, under moderate drought stress, AM inoculation enhances photosynthetic efficiency of blueberry through both non-stomatal and stomatal factors,

CLC Number:

Q945.78

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