Tropic Orientation Responses of Pathogenic Fungi

Brand, Alexandra; Gow, Neil A. R.

doi:10.1007/978-3-642-22916-9_2

Cited by 15 publications

(6 citation statements)

References 92 publications

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“…These two constituents have been reported as growth stimulants for F. graminearum, and thus their accumulation in wheat anthers is considered as a susceptibility factor (Strange et al, 1974). As shown by Brand and Gow (2012), an ideal hyphal orientation is essential for successful infection. When assessed under experimental conditions, the growth of F. graminearum conidia after germination was observed to be directed to the ovary (Blumke et al 2014).…”

Section: Epidemiologymentioning

confidence: 99%

Building on a foundation: advances in epidemiology, resistance breeding, and forecasting research for reducing the impact of fusarium head blight in wheat and barley

Fernando

Oghenekaro

Tucker

et al. 2021

Canadian Journal of Plant Pathology

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Section: Epidemiologymentioning

confidence: 99%

Building on a foundation: advances in epidemiology, resistance breeding, and forecasting research for reducing the impact of fusarium head blight in wheat and barley

Fernando

Oghenekaro

Tucker

et al. 2021

Canadian Journal of Plant Pathology

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“…This implicitly assumes that the probability of colonizing stomata outside the focal area is 0 because they are too far away. This assumption may be unrealistic for larger pathogens, such as fungi, whose hyphae can travel longer distances on the leaf surface (Brand and Gow, 2012). In Appendix 1: Spatially Implicit Model I derive a simpler, but spatially implicit model that relaxes the assumption the pathogens must colonize a stomate within their focal triangle.…”

Section: Spatial Representation Of Pathogen Searchmentioning

confidence: 99%

A Stomatal Model of Anatomical Tradeoffs Between Gas Exchange and Pathogen Colonization

Muir

2020

Front. Plant Sci.

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Stomatal pores control leaf gas exchange and are one route for infection of internal plant tissues by many foliar pathogens, setting up the potential for tradeoffs between photosynthesis and pathogen colonization. Anatomical shifts to lower stomatal density and/or size may also limit pathogen colonization, but such developmental changes could permanently reduce the gas exchange capacity for the life of the leaf. I developed and analyzed a spatially explicit model of pathogen colonization on the leaf as a function of stomatal size and density, anatomical traits which partially determine maximum rates of gas exchange. The model predicts greater stomatal size or density increases the probability of colonization, but the effect is most pronounced when the fraction of leaf surface covered by stomata is low. I also derived scaling relationships between stomatal size and density that preserves a given probability of colonization. These scaling relationships set up a potential anatomical conflict between limiting pathogen colonization and minimizing the fraction of leaf surface covered by stomata. Although a connection between gas exchange and pathogen defense has been suggested empirically, this is the first mathematical model connecting gas exchange and pathogen defense via stomatal anatomy. A limitation of the model is that it does not include variation in innate immunity and stomatal closure in response to pathogens. Nevertheless, the model makes predictions that can be tested with experiments and may explain variation in stomatal size and density among plants. The model is generalizable to many types of pathogens, but lacks significant biological realism that may be needed for precise predictions.

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“…Because the pathogen can use the open stomata and other openings of the host as a route of entry to penetrate the internal tissues [ 7 ], it is thought that teliospores deposited at random on a leaf’s surface should develop mechanisms of displacement toward the entry pathways to the plant. Brand and Gow [ 65 ] summarize the current knowledge regarding spore movement during plant–pathogen interaction. The two most frequently suggested mechanisms are submicroscopic contractions of helically distributed fibrils in cell walls and the existence of mobile appendages in zoospores.…”

Section: The Role Of the Cytoskeleton In Teliospore Motilitymentioning

confidence: 99%

Physiological Basis of Smut Infectivity in the Early Stages of Sugar Cane Colonization

Vicente

Legaz

Sánchez-Elordi

2021

JoF

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Sugar cane smut (Sporisorium scitamineum) interactions have been traditionally considered from the plant’s point of view: How can resistant sugar cane plants defend themselves against smut disease? Resistant plants induce several defensive mechanisms that oppose fungal attacks. Herein, an overall view of Sporisorium scitamineum’s mechanisms of infection and the defense mechanisms of plants are presented. Quorum sensing effects and a continuous reorganization of cytoskeletal components, where actin, myosin, and microtubules are required to work together, seem to be some of the keys to a successful attack.

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Tropic Orientation Responses of Pathogenic Fungi

Cited by 15 publications

References 92 publications

Building on a foundation: advances in epidemiology, resistance breeding, and forecasting research for reducing the impact of fusarium head blight in wheat and barley

Building on a foundation: advances in epidemiology, resistance breeding, and forecasting research for reducing the impact of fusarium head blight in wheat and barley

A Stomatal Model of Anatomical Tradeoffs Between Gas Exchange and Pathogen Colonization

Physiological Basis of Smut Infectivity in the Early Stages of Sugar Cane Colonization

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