Mycorrhizosphere interactions to improve plant fitness and soil quality |
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Authors: | Barea José-Miguel Azcón Rosario Azcón-Aguilar Concepción |
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Institution: | (1) Departamento de Microbilogía del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, Prof. Albareda 1, 18008 Granada, Spain |
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Abstract: | Arbuscular mycorrhizal fungi are key components of soil microbiota and obviously interact with other microorganisms in the
rhizosphere, i.e. the zone of influence of plant roots on microbial populations and other soil constituents. Mycorrhiza formation
changes several aspects of plant physiology and some nutritional and physical properties of the rhizospheric soil. These effects
modify the colonization patterns of the root or mycorrhizas (mycorrhizosphere) by soil microorganisms. The rhizosphere of
mycorrhizal plants, in practice a mycorrhizosphere, harbors a great array of microbial activities responsible for several
key ecosystem processes. This paper summarizes the main conceptual principles and accepted statements on the microbial interactions
between mycorrhizal fungi and other members of rhizosphere microbiota and discusses current developments and future trends
concerning the following topics: (i) effect of soil microorganisms on mycorrhiza formation; (ii) mycorrhizosphere establishment;
(iii) interactions involved in nutrient cycling and plant growth; (iv) interactions involved in the biological control of
plant pathogens; and (v) interactions to improve soil quality. The main conclusion is that microbial interactions in the rhizosphere
of mycorrhizal plants improve plant fitness and soil quality, critical issues for a sustainable agricultural development and
ecosystem functioning.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | arbuscular mycorrhiza biocontrol N-fixing bacteria PGPR phosphate-solubilizing microorganisms soil aggregation |
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