Catálogo CEIBA de la Biblioteca Central de FAUBA


Vista normal Vista MARC Vista ISBD

Azospirillum and arbuscular mycorrhizal colonization enhance rice growth and physiological traits under well-watered and drought conditions

Por: Ruíz Sánchez, M.
Colaborador(es): Armada, E | Muñoz, Y | García de Salamone, I. E | Aroca, R | Ruíz Lozano, J. M | Azcón, R.
ISSN: 0176-1617.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): ARBUSCULAR MYCORRHIZAL SYMBIOSIS | AZOSPIRILLUM | DROUGHT | PGPR | ANTIOXIDANT | PROLINE | WATER | BIOMASS | DEHYDRATION | EVAPOTRANSPIRATION | GROWTH, DEVELOPMENT AND AGING | METABOLISM | MICROBIOLOGY | MYCORRHIZA | OXIDATIVE STRESS | PHOTOSYNTHESIS | PHYSIOLOGY | PLANT LEAF | PLANT ROOT | RANDOMIZATION | RICE | SOIL | ANTIOXIDANTS | AZOSPIRILLUM | DEHYDRATION | MYCORRHIZAE | ORYZA SATIVA | OXIDATIVE STRESS | PHOTOSYNTHESIS | PLANT LEAVES | PLANT ROOTS | PLANT TRANSPIRATION | RANDOM ALLOCATION | SOIL | SUNLIGHT | SYMBIOSIS | ARBUSCULAR | AZOSPIRILLUM BRASILENSE | FUNGI | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Journal of Plant Physiology Vol. 168, no. 10 (2011) 1031-1037Resumen: The response of rice plants to inoculation with an arbuscular mycorrhizal [AM] fungus, Azospirillum brasilense, or combination of both microorganisms, was assayed under well-watered or drought stress conditions. Water deficit treatment was imposed by reducing the amount of water added, but AM plants, with a significantly higher biomass, received the same amount of water as non-AM plants, with a poor biomass. Thus, the water stress treatment was more severe for AM plants than for non-AM plants. The results showed that AM colonization significantly enhanced rice growth under both water conditions, although the greatest rice development was reached in plants dually inoculated under well-watered conditions. Water level did not affect the efficiency of photosystem II, but both AM and A. brasilense inoculations increased this value. AM colonization increased stomatal conductance, particularly when associated with A. brasilense, which enhanced this parameter by 80 percent under drought conditions and by 35 percent under well-watered conditions as compared to single AM plants. Exposure of AM rice to drought stress decreased the high levels of glutathione that AM plants exhibited under well-watered conditions, while drought had no effect on the ascorbate content. The decrease of glutathione content in AM plants under drought stress conditions led to enhance lipid peroxidation. On the other hand, inoculation with the AM fungus itself increased ascorbate and proline as protective compounds to cope with the harmful effects of water limitation. Inoculation with A. brasilense also enhanced ascorbate accumulation, reaching a similar level as in AM plants. These results showed that, in spite of the fact that drought stress imposed by AM treatments was considerably more severe than non-AM treatments, rice plants benefited not only from the AM symbiosis but also from A. brasilense root colonization, regardless of the watering level. However, the beneficial effects of A. brasilense on most of the physiological and biochemical traits of rice plants were only clearly visible when the plants were mycorrhized. This microbial consortium was effective for rice plants as an acceptable and ecofriendly technology to improve plant performance and development.
Etiquetas de esta biblioteca: No hay etiquetas de esta biblioteca para este título. Ingresar para agregar etiquetas.
    valoración media: 0.0 (0 votos)

The response of rice plants to inoculation with an arbuscular mycorrhizal [AM] fungus, Azospirillum brasilense, or combination of both microorganisms, was assayed under well-watered or drought stress conditions. Water deficit treatment was imposed by reducing the amount of water added, but AM plants, with a significantly higher biomass, received the same amount of water as non-AM plants, with a poor biomass. Thus, the water stress treatment was more severe for AM plants than for non-AM plants. The results showed that AM colonization significantly enhanced rice growth under both water conditions, although the greatest rice development was reached in plants dually inoculated under well-watered conditions. Water level did not affect the efficiency of photosystem II, but both AM and A. brasilense inoculations increased this value. AM colonization increased stomatal conductance, particularly when associated with A. brasilense, which enhanced this parameter by 80 percent under drought conditions and by 35 percent under well-watered conditions as compared to single AM plants. Exposure of AM rice to drought stress decreased the high levels of glutathione that AM plants exhibited under well-watered conditions, while drought had no effect on the ascorbate content. The decrease of glutathione content in AM plants under drought stress conditions led to enhance lipid peroxidation. On the other hand, inoculation with the AM fungus itself increased ascorbate and proline as protective compounds to cope with the harmful effects of water limitation. Inoculation with A. brasilense also enhanced ascorbate accumulation, reaching a similar level as in AM plants. These results showed that, in spite of the fact that drought stress imposed by AM treatments was considerably more severe than non-AM treatments, rice plants benefited not only from the AM symbiosis but also from A. brasilense root colonization, regardless of the watering level. However, the beneficial effects of A. brasilense on most of the physiological and biochemical traits of rice plants were only clearly visible when the plants were mycorrhized. This microbial consortium was effective for rice plants as an acceptable and ecofriendly technology to improve plant performance and development.

No hay comentarios para este ítem.

Ingresar a su cuenta para colocar un comentario.

Av. San Martín 4453 - 1417 – CABA – Argentina.
Sala de lectura de Planta Baja: bibliote@agro.uba.ar (54 11) 5287-0013
Referencia: referen@agro.uba.ar (54 11) 5287-0418
Hemeroteca: hemerote@agro.uba.ar (54 11) 5287-0218