An adequate Fe nutritional status of maize suppresses infection and biotrophic growth of <i>Colletotrichum graminicola</i>

Ye, Fanghua; Albarouki, Emad; Lingam, Brahmasivasenkar; Deising, H. B.; Wirén, Nicolaus von

doi:10.1111/ppl.12166

Cited by 38 publications

(36 citation statements)

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“…Photographs were taken with a CCD-camera Digital Sight DS-Fi1 (Nikon) and were analysed with the software NIS-Elements D (version 2.30, Nikon). Production of hydrogen peroxide in infected tissues was visualised by DAB staining as reported previously [ 52 ].…”

Section: Methodsmentioning

confidence: 99%

Correspondence between symptom development of Colletotrichum graminicola and fungal biomass, quantified by a newly developed qPCR assay, depends on the maize variety

et al. 2016

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BackgroundPenetration attempts of the hemibiotroph Colletotrichum graminicola may activate PAMP-triggered immunity (PTI) on different cultivars of Zea mays to different extent. However, in most events, this does not prevent the establishment of a compatible pathogenic interaction. In this study, we investigate the extent to which the host variety influences PTI. Furthermore, we assess whether visual disease symptoms occurring on different maize varieties reliably reflect fungal biomass development in planta as determined by qPCR and GFP tracing.ResultsEmploying a set of four maize varieties, which were selected from a panel of 27 varieties, for in-depth assessment of pathogenesis of the wild type strain of C. graminicola, revealed considerable differences in susceptibility as evidenced by symptom severity that decreased from variety Golden Jubilee to Mikado to Farmtop to B73. However, a newly developed qPCR assay and microscopical observation of a GFP-labelled strain showed that disease symptoms are in some instances inconsistent when compared with other indicators of susceptibility. Of the four varieties assessed, either Golden Jubilee, Mikado and B73, or Golden Jubilee, Farmtop and B73 showed a direct correlation between symptom and fungal biomass development. In a pairwise comparison, however, Mikado and Farmtop showed an inverse correlation for these features.ConclusionsThe genotype of maize contributes to the severity of symptoms resulting from an infection with C. graminicola. Partially, this may be attributed to the extent of PTI activated in different varieties, as reflected by papilla formation. Furthermore, when evaluating the susceptibility of a variety, it should be considered that symptom severity must not have to reflect the extent of fungal growth in the infected tissue.Electronic supplementary materialThe online version of this article (doi:10.1186/s12866-016-0709-4) contains supplementary material, which is available to authorized users.

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Section: Methodsmentioning

confidence: 99%

Correspondence between symptom development of Colletotrichum graminicola and fungal biomass, quantified by a newly developed qPCR assay, depends on the maize variety

et al. 2016

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“…Recruitment of iron to infection sites, to exploit its redox chemistry, is a critical immune response for many plants, particularly the Poaceae. Iron-deficient maize is unable to produce ROS at Colletotrichum infection sites, and this correlates with increased susceptibility to this hemibiotrophic fungal pathogen (107). Maize recruits ferric iron to the infection site against corn powdery mildew (Blumeria graminis), and application of iron chelators decreases resistance to this pathogen (108).…”

Section: Iron As a Tool In Plant Immunitymentioning

confidence: 99%

Iron homeostasis and plant immune responses: Recent insights and translational implications

Herlihy

Long

McDowell

2020

Journal of Biological Chemistry

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Iron (Fe) metabolism and the plant immune system are both critical for plant vigor in natural ecosystems and for reliable agricultural productivity. Mechanistic studies of plant iron homeostasis and plant immunity have traditionally been carried out in isolation from each other; however, our growing understanding of both processes has uncovered significant connections. For example, iron plays a critical role in the generation of reactive oxygen intermediates during immunity and has been recently implicated as a critical factor for immune-initiated cell death via ferroptosis. Moreover, plant iron stress triggers immune activation, suggesting that sensing of iron depletion is a mechanism by which plants recognize a pathogen threat. The iron deficiency response engages hormone signaling sectors that are also utilized for plant immune signaling, providing a probable explanation for iron-immunity cross-talk. Finally, interference with iron acquisition by pathogens might be a critical component of the immune response. Efforts to address the global burden of iron deficiency-related anemia, have focused on classical breeding and transgenic approaches to develop crops biofortified for iron content. However, our improved mechanistic understanding of plant iron metabolism suggests that such alterations could promote or impede plant immunity, depending on the nature of the alteration and the virulence strategy of the pathogen. Effects of iron biofortification on disease resistance should be evaluated while developing plants for iron biofortification.

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“…As a result, these pathogens cause more disease on plants grown under high-iron conditions (top panel) than on plants grown under iron-deficient conditions (bottom panel) (33,62). However, high iron availability in the host can favor the development of oxidative stress (symbolized by the size of H 2 O 2 ), thereby promoting defense against pathogens such as Colletotrichum graminicola (149). Solid lines and arrows indicate stronger activity of the indicated process than do dotted lines and arrows.…”

Section: Iron and Immunity Across Kingdoms Of Lifementioning

confidence: 99%

Iron and Immunity

Verbon

Trapet

Stringlis

et al. 2017

Annu. Rev. Phytopathol.

202

182

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Iron is an essential nutrient for most life on Earth because it functions as a crucial redox catalyst in many cellular processes. However, when present in excess iron can lead to the formation of harmful hydroxyl radicals. Hence, the cellular iron balance must be tightly controlled. Perturbation of iron homeostasis is a major strategy in host-pathogen interactions. Plants use iron-withholding strategies to reduce pathogen virulence or to locally increase iron levels to activate a toxic oxidative burst. Some plant pathogens counteract such defenses by secreting iron-scavenging siderophores that promote iron uptake and alleviate iron-regulated host immune responses. Mutualistic root microbiota can also influence plant disease via iron. They compete for iron with soil-borne pathogens or induce a systemic resistance that shares early signaling components with the root iron-uptake machinery. This review describes the progress in our understanding of the role of iron homeostasis in both pathogenic and beneficial plant-microbe interactions.

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An adequate Fe nutritional status of maize suppresses infection and biotrophic growth of Colletotrichum graminicola

Cited by 38 publications

References 48 publications

Correspondence between symptom development of Colletotrichum graminicola and fungal biomass, quantified by a newly developed qPCR assay, depends on the maize variety

Correspondence between symptom development of Colletotrichum graminicola and fungal biomass, quantified by a newly developed qPCR assay, depends on the maize variety

Iron homeostasis and plant immune responses: Recent insights and translational implications

Iron and Immunity

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