Elucidating mechanisms of mycorrhiza-induced resistance against Thielaviopsis basicola via targeted transcript analysis of Petunia hybrida genes

Hayek, Soukayna; Gianinazzi‐Pearson, Vivienne; Gianinazzi, Silvio; Franken, Philipp

doi:10.1016/j.pmpp.2014.09.003

Cited by 13 publications

(6 citation statements)

References 66 publications

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“…In addition to these changes in the host plant, beneficial effects have been associated with changes in the microrhizosphere (Cameron et al, 2013 ). In fact, most reports suggest an induced resistance mechanism rather than increased tolerance or fungal competition between the AMF and the pathogen since AM plants are able to reduce the extent of the pathogen infection (Cordier et al, 1998 ; Campos-Soriano et al, 2011 ; Song et al, 2013 ; Hayek et al, 2014 ). This protection is known as mycorrhiza-induced resistance (MIR) (Pozo and Azcón-Aguilar, 2007 ; Jung et al, 2012 ) and in many respects resembles to rhizobacteria-induced systemic resistance (ISR) (Pieterse et al, 2014 ).…”

Section: Introductionmentioning

confidence: 99%

The Nitrogen Availability Interferes with Mycorrhiza-Induced Resistance against Botrytis cinerea in Tomato

Sánchez-Bel¹,

Troncho

Gamir

et al. 2016

Front. Microbiol.

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Mycorrhizal plants are generally quite efficient in coping with environmental challenges. It has been shown that the symbiosis with arbuscular mycorrhizal fungi (AMF) can confer resistance against root and foliar pathogens, although the molecular mechanisms underlying such mycorrhiza-induced resistance (MIR) are poorly understood. Tomato plants colonized with the AMF Rhizophagus irregularis display enhanced resistance against the necrotrophic foliar pathogen Botrytis cinerea. Leaves from arbuscular mycorrhizal (AM) plants develop smaller necrotic lesions, mirrored also by a reduced levels of fungal biomass. A plethora of metabolic changes takes place in AMF colonized plants upon infection. Certain changes located in the oxylipin pathway indicate that several intermediaries are over-accumulated in the AM upon infection. AM plants react by accumulating higher levels of the vitamins folic acid and riboflavin, indolic derivatives and phenolic compounds such as ferulic acid and chlorogenic acid. Transcriptional analysis support the key role played by the LOX pathway in the shoots associated with MIR against B. cinerea. Interestingly, plants that have suffered a short period of nitrogen starvation appear to react by reprogramming their metabolic and genetic responses by prioritizing abiotic stress tolerance. Consequently, plants subjected to a transient nitrogen depletion become more susceptible to B. cinerea. Under these experimental conditions, MIR is severely affected although still functional. Many metabolic and transcriptional responses which are accumulated or activated by MIR such NRT2 transcript induction and OPDA and most Trp and indolic derivatives accumulation during MIR were repressed or reduced when tomato plants were depleted of N for 48 h prior infection. These results highlight the beneficial roles of AMF in crop protection by promoting induced resistance not only under optimal nutritional conditions but also buffering the susceptibility triggered by transient N depletion.

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Section: Introductionmentioning

confidence: 99%

The Nitrogen Availability Interferes with Mycorrhiza-Induced Resistance against Botrytis cinerea in Tomato

Sánchez-Bel¹,

Troncho

Gamir

et al. 2016

Front. Microbiol.

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“…They could be operative at the same time (Pozo and Azcón-Aguilar 2007 ) or might act consecutively (Cameron et al 2013 ). MIR includes a priming of defenserelated plant genes and shares more elements with the ISR induced by rhizobacteria against necrotrophs via a jasmonate JA-mediated pathway than with salicylic acidregulated SAR, induced by leaf pathogens via an SA-mediated pathway and directed against biotrophs (Pozo and Azcón-Aguilar 2007 ;Hayek et al 2014 ;Jung et al 2012 ; ).…”

Section: Mycorrhiza-induced Resistance (Mir)mentioning

confidence: 99%

Plant, Soil and Microbes

2016

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“…Hence, petunia is an ideal system for studying MIR because general mycorrhiza‐regulated responses can be distinguished from responses specifically associated with MIR in these plants. The first gene expression studies using this system pointed to particular members of gene families encoding chitinases and lipoxygenases that could play a role in MIR (Hayek et al ).…”

Section: Research On Arbuscular Mycorrhiza In Petuniamentioning

confidence: 99%

Petunia as model for elucidating adventitious root formation and mycorrhizal symbiosis: at the nexus of physiology, genetics, microbiology and horticulture

Druege

Franken

2018

Physiologia Plantarum

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Adventitious root formation in cuttings and establishment of arbuscular mycorrhizal symbiosis reflect the enormous plasticity of plants and are key factors in the efficient and sustainable clonal propagation and production of ornamental crops. Based on the high importance of Petunia hybrida for the European and US annual bedding plant markets and its suitability as a model for basic plant sciences, petunia has been established as an experimental system for elucidating the molecular and physiological processes underlying adventitious root formation and mycorrhizal symbiosis. In the present review, we introduce the tools of the Petunia model system. Then, we discuss findings regarding the hormonal and metabolic control of adventitious rooting in the context of diverse environmental factors as well as findings on the function of arbuscular mycorrhiza related to nutrient uptake and resistance to root pathogens. Considering the recent publication of the genomes of the parental species of P. hybrida and other tools available in the petunia scientific community, we will outline the quality of petunia as a model for future system-oriented analysis of root development and function in the context of environmental and genetic control, which are at the heart of modern horticulture.

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Elucidating mechanisms of mycorrhiza-induced resistance against Thielaviopsis basicola via targeted transcript analysis of Petunia hybrida genes

Cited by 13 publications

References 66 publications

The Nitrogen Availability Interferes with Mycorrhiza-Induced Resistance against Botrytis cinerea in Tomato

The Nitrogen Availability Interferes with Mycorrhiza-Induced Resistance against Botrytis cinerea in Tomato

Plant, Soil and Microbes

Petunia as model for elucidating adventitious root formation and mycorrhizal symbiosis: at the nexus of physiology, genetics, microbiology and horticulture

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