Mycorrhiza-induced resistance: more than the sum of its parts?

Cameron, Duncan D.; Neal, Andrew L.; Wees, Saskia C.M. Van; Ton, Jurriaan

doi:10.1016/j.tplants.2013.06.004

Cited by 441 publications

(373 citation statements)

References 86 publications

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“…Furthermore, the gene coding for the homeoboxLeu zipper ATHB-7 as well as two isoforms of zeaxanthin epoxidases and 9-cis-epoxy-carotenoid dioxygenase, involved in ABA biosynthesis (Xiong and Zhu, 2003), were found to be up-regulated. Taken together, these results highlight the activation in AM leaves of oxylipin/ JA-and ABA-regulated pathways, also known to promote systemic defense mechanisms in mycorrhized roots (Cameron et al, 2013). In addition, one gene coding for cytokinin-O-glucosyltransferase was up-regulated in AM leaves (Table II).…”

Section: Am Symbiosis Activates Genes Involved In Lipid and Hormone Bmentioning

confidence: 52%

“…Although AM symbiosis is restricted to the root, alterations also occur in the shoot, suggesting the existence of signaling pathways responsible for the induction of systemic responses throughout the plant (Cameron et al, 2013). Hormones involved in plant growth (auxins, cytokinins [CKs], and strigolactones) and in stress responses (ethylene, ABA, JA, and SA) are signals thought to mediate alterations in the roots as well as in the shoots of AM plants (Miransari et al, 2014).…”

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confidence: 99%

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Enhanced Secondary- and Hormone Metabolism in Leaves of Arbuscular Mycorrhizal Medicago truncatula

et al. 2017

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Arbuscular mycorrhizas (AM) are the most common symbiotic associations between a plant's root compartment and fungi. They provide nutritional benefit (mostly inorganic phosphate [P i ]), leading to improved growth, and nonnutritional benefits, including defense responses to environmental cues throughout the host plant, which, in return, delivers carbohydrates to the symbiont. However, how transcriptional and metabolic changes occurring in leaves of AM plants differ from those induced by P i fertilization is poorly understood. We investigated systemic changes in the leaves of mycorrhized Medicago truncatula in conditions with no improved P i status and compared them with those induced by high-P i treatment in nonmycorrhized plants. Microarray-based genome-wide profiling indicated up-regulation by mycorrhization of genes involved in flavonoid, terpenoid, jasmonic acid (JA), and abscisic acid (ABA) biosynthesis as well as enhanced expression of MYC2, the master regulator of JA-dependent responses. Accordingly, total anthocyanins and flavonoids increased, and most flavonoid species were enriched in AM leaves. Both the AM and P i treatments corepressed iron homeostasis genes, resulting in lower levels of available iron in leaves. In addition, higher levels of cytokinins were found in leaves of AM-and P i -treated plants, whereas the level of ABA was increased specifically in AM leaves. Foliar treatment of nonmycorrhized plants with either ABA or JA induced the up-regulation of MYC2, but only JA also induced the up-regulation of flavonoid and terpenoid biosynthetic genes. Based on these results, we propose that mycorrhization and P i fertilization share cytokinin-mediated improved shoot growth, whereas enhanced ABA biosynthesis and JA-regulated flavonoid and terpenoid biosynthesis in leaves are specific to mycorrhization.

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Section: Am Symbiosis Activates Genes Involved In Lipid and Hormone Bmentioning

confidence: 52%

mentioning

confidence: 99%

Enhanced Secondary- and Hormone Metabolism in Leaves of Arbuscular Mycorrhizal Medicago truncatula

et al. 2017

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“…The rate of soil degradation is highly dependent not just upon agricultural practice but upon the frequency of extreme climatic events. Therefore, research is being directed to understand how to prevent further soil loss by rebuilding communities of beneficial soil microbes in agricultural soils and encouraging the adoption of novel agricultural management strategies that restore soil ecosystem function (Cameron et al 2013). An important element of this research is the collaboration between scientists and farmers, deploying scientific knowledge about soil conservation in farming practices (MacMillan and Benton 2014).…”

Section: Environmental and Socio-economic Benefitsmentioning

confidence: 99%

An agenda for integrated system-wide interdisciplinary agri-food research

et al. 2017

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This paper outlines the development of an integrated interdisciplinary approach to agri-food research, designed to address the 'grand challenge' of global food security. Rather than meeting this challenge by working in separate domains or via single-disciplinary perspectives, we chart the development of a system-wide approach to the food supply chain. In this approach, social and environmental questions are simultaneously addressed. Firstly, we provide a holistic model of the agri-food system, which depicts the processes involved, the principal inputs and outputs, the actors and the external influences, emphasising the system's interactions, feedbacks and complexities. Secondly, we show how this model necessitates a research programme that includes the study of land-use, crop production and protection, food processing, storage and distribution, retailing and consumption, nutrition and public health. Acknowledging the methodological and epistemological challenges involved in developing this approach, we propose two specific ways forward. Firstly, we propose a method for analysing and modelling agri-food systems in their totality, which enables the complexity to be reduced to essential components of the whole system to allow tractable quantitative analysis using LCA and related methods. This initial analysis allows for more detailed quantification of total system resource efficiency, environmental impact and waste. Secondly, we propose a method to analyse the ethical, legal and political tensions that characterise such systems via the use of deliberative fora. We conclude by proposing an agenda for agri-food research which combines these two approaches into a rational programme for identifying, testing and implementing the new agri-technologies and agri-food policies, advocating the critical application of nexus thinking to meet the global food security challenge.

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“…Los HMA juegan un papel importante en el control de diversos fitopatógenos a través de mecanismos directos o indirectos (Jung et al, 2012). Mecanismos directos como la competencia por sitios de colonización (Cordier et al, 1998;Larsen et al, 2012;Hernández-Montiel et al, 2013;Reyes-Tena et al, 2016), cambios en la composición de exudados radicales (Scheffknecht et al, 2006;Ren et al, 2015) e indirectos como la resistencia inducida por la micorrización de los diferentes mecanismos de defensa vegetal (Jung et al, 2012;Cameron et al, 2013). Jaiti et al (2007) encontraron que plantas de palma datilera (Phoenix dactylifera) inoculadas con un consorcio nativo (Glomus sp., Sclerocystis sp., Acaulospora sp.…”

Section: Fully Bilingualunclassified

Micorrización de Agave cupreata: Biocontrol de Fusarium oxysporum y promoción del crecimiento vegetal

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et al. 2017

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<p>Se evaluó el efecto de la inoculación micorrícica de plantas de Agave cupreata en el biocontrol de Fusarium oxysporum y en la promoción del crecimiento vegetal. En invernadero, semillas de A. cupreata fueron inoculadas con cuatro consorcios de hongos micorrícicos arbusculares (HMA) nativos, denominados El Huizachal (EH), Agua Dulce (AD), Paso Ancho (PA) y Cerro del Metate (CM), un inóculo comercial micorriza INIFAP® (MI) y un testigo sin HMA. Siete meses después de inocular los HMA, en un grupo de plantas micorrizadas y sin micorrizar se evaluó la promoción del crecimiento vegetal y otro grupo similar de plantas fueron inoculadas con o sin Fusarium oxysporum FPC (Fox) para evaluar el potencial efecto de biocontrol de los HMA. Los resultados mostraron que la micorrización incrementó significativamente (Tukey, p≤0.05) la biomasa seca total de las plantas, en un intervalo entre 148 y 239 % más con respecto al testigo sin HMA. A los 240 días después de la inoculación de Fox, los tratamientos PA+Fox y MI+Fox mostraron un efecto significativo (Kruskal-Wallis, p≤0.05) en la disminución de la severidad de la marchitez del agave con un promedio de daño de 33 % con respecto al testigo+Fox que presentó daños de 74 %. PA y MI pueden considerarse como potenciales biofertilizantes y agentes de biocontrol de F. oxysporum en el cultivo del agave.</p>

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Mycorrhiza-induced resistance: more than the sum of its parts?

Cited by 441 publications

References 86 publications

Enhanced Secondary- and Hormone Metabolism in Leaves of Arbuscular Mycorrhizal Medicago truncatula

Enhanced Secondary- and Hormone Metabolism in Leaves of Arbuscular Mycorrhizal Medicago truncatula

An agenda for integrated system-wide interdisciplinary agri-food research

Micorrización de Agave cupreata: Biocontrol de Fusarium oxysporum y promoción del crecimiento vegetal

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