Mycorrhizal is a typical host plant-fungal symbiotic interaction, although a large number of anatomical and physiological studies clearly show that fungal mycorrhiza can increase the host plant root absorption area, synthesize and release organic compounds and bacteria to the soil Exogenous enzymes fix nutrients and regulate the proteins involved in the transport of nutrients across the membrane of host plant roots, but the specific mechanism is currently unclear. Recently, "New Phytologist" magazine reported the results of Portuguese researcher Feijó and others using "non-damage micro-measurement technology" (ion-selective vibrating probe) to study the role of ion current in the process of mycorrhizal growth. They detected the ion currents of H +, Ca2 +, and anion A- (replaced by Cl-) in the roots of Eucalyptus after infestation and non-infection treatment of Bean Lycoperdon (ECM). At the same time, they used specific inhibitors alumate, gadolinium and 4,4-diisothiocyanato-2,2-disulfonyl stilbene (DIDS) to inhibit the proton pump, calcium ion channel and chloride ion transport channel, respectively. The above three ion currents were detected. The results showed that the fungal infection mainly acted on the root elongation area, and the ion movement and the acidity of the root circumference changed drastically, and the ion current changes showed periodic changes. Continuous wavelength spectroscopy analysis showed that the change period of H + and A- ion currents in the ECM roots was longer than that in the uninfected state, and the Ca2 + oscillations in the ECM roots completely disappeared. Based on the above results, Feijó et al. Constructed a model to explain that plant nutrient absorption and growth acceleration are mediated by infection of fungi and depend on changes in pH, and the main supply of ECM nutrients is plant roots, and found that Ca2 + plays an important role in this process. The role of this provides evidence and models for uncovering plant-fungal symbiosis. Keywords: Ca2 + (calcium); mycorrhizal (ectomycorrhizas); legume L. fungus (ECM); non-damage micro-testing technology (ion-selective vibrating probe) Reference: Feijó JA et al. New Phytologist, 2009,181 : 448-462

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