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      Effect of light-emitting diodes on arbuscular mycorrhizal fungi associated with bahiagrass (Paspalum notatum Flügge) and millet [Pennisetum glaucum (L.) R.Br] Translated title: Efecto de diodos emisores de luz (LED) sobre hongos micorrízicos arbusculares asociados a pasto bahía (Paspalum notatum Flügge) y mijo perla [Pennisetum glaucum (L.) R.Br]


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          This research was conducted to verify the in vivo effects of light-emitting diodes (LED) on propagule formation of arbuscular mycorrhizal fungi (AMF) in pots cultivated with bahiagrass and millet. A glass pot was separated into two sections, inside and outside, and placed in a paper box covered with aluminum foil. In the inner section, spores of AMF, bahiagrass, and millet seedlings were inserted, while the outer section was filled with glass beads (1 mm diameter). Spores of the AMF, Gigaspora margarita Becker and Hall, from commercial inoculums and two kinds of LED, red and blue, were utilized for this experiment with different combinations: dark (the control pot), blue, red, red+blue, red/blue (alternated every 12 h) and red-blue (red for 60 days followed by blue for 30 days). The experiment was conducted for a total of 90 days. Among LED treatments the red-blue induced higher plant growth in millet seedlings although the growth did not surpass the one of the control. This response was less notorious in bahiagrass. On the other hand, the plant growth under blue LED was always lower than the control. The red-blue and red alone treatments stimulated the formation of AMF spores in glass beads, whereas the blue treatment alone inhibited it. In summary, based on AMF colonization and sporulation, red-blue and red alone treatments were the most efficient.

          Translated abstract

          Esta investigación se llevó a cabo para comprobar los efectos in vivo de los diodos emisores de luz (LED) en la formación de propágulos de hongos micorrícicos arbusculares (HMA) dentro de contenedores con pasto bahía y mijo perla. Vasos de vidrio separados en dos secciones, dentro y fuera, fueran colocados en cajas de cartón cubiertas con papel de aluminio. En la sección interna se inoculó con las esporas de HMA junto con las plántulas de pasto bahía y mijo, mientras que la sección exterior contenía perlas de vidrio (1 mm de diámetro). Las esporas de la HMA, Gigaspora margarita Becker y Hall, provenientes de inóculos comerciales y dos tipos de LED (rojo y azul), se utilizaron en este experimento con diferentes combinaciones: oscuridad (tratamiento testigo), azul, rojo, rojo+azul, rojo/azul (alternado cada 12 h) y rojo-azul (rojo durante 60 días, seguido de azul por 30 días). El experimento se llevó a cabo durante de 90 días. Entre los tratamientos con LED, el rojo-azul indujo mayor crecimiento de las plantas de mijo aunque este crecimiento no superó al del testigo. Los tratamientos rojo-azul y solo rojo estimularon la formación de esporas de HMA en las perlas de vidrio, mientras que el tratamiento solo azul inhibió dicha formación. En resumen, basados en la colonización y la esporulación de los HMA, los tratamientos rojo-azul y solo rojo fueron los más eficientes.

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          Most cited references29

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          Inactivation of bacterial pathogens following exposure to light from a 405-nanometer light-emitting diode array.

          This study demonstrates the susceptibility of a variety of medically important bacteria to inactivation by 405-nm light from an array of light-emitting diodes (LEDs), without the application of exogenous photosensitizer molecules. Selected bacterial pathogens, all commonly associated with hospital-acquired infections, were exposed to the 405-nm LED array, and the results show that both gram-positive and gram-negative species were successfully inactivated, with the general trend showing gram-positive species to be more susceptible than gram-negative bacteria. Detailed investigation of the bactericidal effect of the blue-light treatment on Staphylococcus aureus suspensions, for a range of different population densities, demonstrated that 405-nm LED array illumination can cause complete inactivation at high population densities: inactivation levels corresponding to a 9-log(10) reduction were achieved. The results, which show the inactivation of a wide range of medically important bacteria including methicillin-resistant Staphylococcus aureus, demonstrate that, with further development, narrow-spectrum 405-nm visible-light illumination from an LED source has the potential to provide a novel decontamination method with a wide range of potential applications.
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            Blue Light Receptors and Signal Transduction

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              Effect of red and green algal extracts on hyphal growth of arbuscular mycorrhizal fungi, and on mycorrhizal development and growth of papaya and passionfruit


                Author and article information

                Role: ND
                Decanato de Agronomía de la Universidad Centroccidental "Lisandro Alvarado" (UCLA)
                December 2016
                : 28
                : 3
                : 163-170
                [1 ] Kyoto Pref. Univ. Japan



                SciELO Venezuela

                Self URI (journal page): http://www.scielo.org.ve/scielo.php?script=sci_serial&pid=1316-3361&lng=en

                General life sciences,General agriculture,Animal science & Zoology
                Colonización micorrízica,Gigaspora margarita,mycorrhizal colonization,Poaceae,sporulation,producción de esporas


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