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Mycorrhiza-Induced Resistance and Priming of Plant Defenses

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Abstract

Symbioses between plants and beneficial soil microorganisms like arbuscular-mycorrhizal fungi (AMF) are known to promote plant growth and help plants to cope with biotic and abiotic stresses. Profound physiological changes take place in the host plant upon root colonization by AMF affecting the interactions with a wide range of organisms below- and above-ground. Protective effects of the symbiosis against pathogens, pests, and parasitic plants have been described for many plant species, including agriculturally important crop varieties. Besides mechanisms such as improved plant nutrition and competition, experimental evidence supports a major role of plant defenses in the observed protection. During mycorrhiza establishment, modulation of plant defense responses occurs thus achieving a functional symbiosis. As a consequence of this modulation, a mild, but effective activation of the plant immune responses seems to occur, not only locally but also systemically. This activation leads to a primed state of the plant that allows a more efficient activation of defense mechanisms in response to attack by potential enemies. Here, we give an overview of the impact on interactions between mycorrhizal plants and pathogens, herbivores, and parasitic plants, and we summarize the current knowledge of the underlying mechanisms. We focus on the priming of jasmonate-regulated plant defense mechanisms that play a central role in the induction of resistance by arbuscular mycorrhizas.

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Acknowledgements

Our research on MIR was financed by grant AGL2006-08029 and AGL2009- 07691 from the Spanish Ministry of Science and Technology. S.C.J. is supported by the JAE program of the Spanish National Research Council (CSIC).

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  1. Department of Soil Microbiology and Symbiotic Systems, Estación Experimental del Zaidín (EEZ), CSIC, Prof. Albareda 1, 18008, Granada, Spain

    Sabine C. Jung, Ainhoa Martinez-Medina, Juan A. Lopez-Raez & Maria J. Pozo

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  1. Sabine C. Jung
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Jung, S.C., Martinez-Medina, A., Lopez-Raez, J.A. et al. Mycorrhiza-Induced Resistance and Priming of Plant Defenses. J Chem Ecol 38, 651–664 (2012). https://doi.org/10.1007/s10886-012-0134-6

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