Control of foliar diseases in barley: towards an integrated approach

Walters, Dale R.; Avrova, Anna O.; Bingham, I. J.; Burnett, F. J.; Fountaine, J. M.; Havis, Neil D.; Hoad, SP; Hughes, G.; Looseley, Mark E.; Oxley, S. J. P.; Renwick, Alan; Topp, Cairistiona F. E.; Newton, A. C.

doi:10.1007/s10658-012-9948-x

Cited by 78 publications

(66 citation statements)

References 212 publications

(227 reference statements)

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“…Previous studies have identified the semi-dwarfing gene sdw1 as a resistance QTL, an effect that is thought to be due to the restriction of splash dispersal in tall cultivars (Newton et al 2004a;Looseley et al 2012b;Walters et al 2012). On the map generated for this population, the mapped position of sdw1 is contained within the region flanked by markers 11_172 and 11_20662 (130.9-135.9 cM) (Malosetti et al 2011).…”

Section: Qtl Effectsmentioning

confidence: 99%

Genetic mapping of resistance to Rhynchosporium commune and characterisation of early infection in a winter barley mapping population

et al. 2014

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The genetic basis of resistance to Rhynchosporium commune was investigated in a winter barley mapping population derived from a cross between cultivars Saffron (moderately susceptible) and Retriever (moderately resistant). Resistance was assessed in field trials through total infection (measured using qPCR), and visible disease symptoms. Phenotypic correlations between both methods of assessing disease severity were high. QTL mapping from three years of field trials identified five significant QTL effects. One QTL effect on chromosome 2H confirms a previously reported resistance from a population derived from the spring cultivar Cocktail and a winter parent derived from the cultivars Pearl and Cocktail. Another QTL effect on 3H corresponds to the reported position of major resistance gene Rrs1. An effect was detected at the mapped position of the semi-dwarfing gene sdw-1 despite the fact that neither parent has the semi-dwarf phenotype. Of the remaining two QTL effects, one on 6H may represent a previously reported rhynchosporium resistance (QTL Triton Rrs6H 271 ), whilst the final QTL, represents a novel resistance. In addition, interactions during early infection stages in the parental lines were studied by confocal microscopy of detached leaves inoculated with a GFP-expressing R. commune isolate. This approach identified a number of major differences in fungal growth morphology between the resistant and susceptible parent.

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Section: Qtl Effectsmentioning

confidence: 99%

Genetic mapping of resistance to Rhynchosporium commune and characterisation of early infection in a winter barley mapping population

et al. 2014

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“…These compounds prime the defence response in the host plant and offer the prospect of broad spectrum disease control by utilising the plants natural defence mechanisms.Results from a number of trials suggest that these compounds may not have a role to play as a solo treatment but did give significant reductions in RLS when applied early (ZGS 24) followed by reduced rate fungicides at ZGS 31 and ZGC39 (Havis et al 2009b). However other trials using a combination of elicitors that activate different defence pathways demonstrated a negative effect on RLS control compared to other pathogens (Walters et al 2012). Although there is potential for using elicitors as part of an integrated control strategy for RLS the reported trade-off between elicitors combinations and RLS highlights that further research is required before these compounds can be recommended for commercial use.…”

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confidence: 99%

Ramularia collo-cygni—An Emerging Pathogen of Barley Crops

et al. 2015

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Ramularia collo-cygni is the biotic factor responsible for the disease Ramularia leaf spot (RLS) of barley (Hordeum vulgare). Despite having been described over 100 years ago and being considered a minor disease in some countries, the fungus is attracting interest in the scientific community as a result of the increasing number of recorded economically damaging disease epidemics. New reports of disease spread and fungal identification using molecular diagnostics have helped redefine RLS as a global disease. This review describes recent developments in our understanding of the biology and epidemiology of the fungus, outlines advances made in the field of the genetics of both the fungus and host, and summarizes the control strategies currently available.

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“…While it has been observed that asymptomatic infections can be important drivers in the epidemiology of forest diseases (Elegbede et al 2010;Denman et al 2008), the potential for host tolerance to increase disease prevalence in adjacent populations or nontolerant host species is rarely acknowledged in a management context (Hayden et al 2013;Little et al 2010). Breeding strategies combining both resistance and tolerance mechanisms therefore appear to be the most desirable (Walters et al 2012). This requires an accurate assessment of resistance and tolerance traits and their interactions (Simms and Triplett 1994), as investigated in the Douglas fir-Armillaria ostoyae pathosystem (Cruikshank and Jaquish 2014).…”

Section: Disease Resistance: Revisiting the Ideotype Concept For Breementioning

confidence: 99%

An evolutionary ecology perspective to address forest pathology challenges of today and tomorrow

Desprez-Loustau

Aguayo²,

Dutech

et al. 2016

Annals of Forest Science

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Abstract& Key message Increasing human impacts on forests, including unintentional movement of pathogens, climate change, and large-scale intensive plantations, are associated with an unprecedented rate of new diseases. An evolutionary ecology perspective can help address these challenges and provide direction for sustainable forest management.& Context Forest pathology has historically relied on an ecological approach to understand and address the practical management of forest diseases. A widening of this perspective to include evolutionary considerations has been increasingly developed in response to the rising rates of genetic change in both pathogen populations and tree populations due to human activities. & Aims Here, five topics for which the evolutionary perspective is especially relevant are highlighted. & Results The first relates to the evolutionary diversity of fungi and fungal-like organisms, with issues linked to the identification of species and their ecological niches. The second theme deals with the evolutionary processes that allow forest pathogens to adapt to new hosts after introductions or to become more virulent in homogeneous plantations. The third theme presents issues linked to disease resistance in tree breeding programs (e.g., growth-defense trade-offs) and proposes new criteria and methods for more durable resistance. The last two themes are dedicated to the biotic environment of the tree-pathogen system, namely, hyperparasites and tree microbiota, as possible solutions for health management. & Conclusion We conclude by highlighting three major conceptual advances brought by evolutionary biology, i.e., that (i) "not everything is everywhere", (ii) evolution of pathogen populations can occur on short time scales, and (iii) the tree is a multitrophic community. We further translate these into a framework for immediate policy recommendations and future directions for research.

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Control of foliar diseases in barley: towards an integrated approach

Abstract: Barley is one of the world's most important crops providing food and related products for millions of people.

Cited by 78 publications

References 212 publications

Genetic mapping of resistance to Rhynchosporium commune and characterisation of early infection in a winter barley mapping population

Genetic mapping of resistance to Rhynchosporium commune and characterisation of early infection in a winter barley mapping population

Ramularia collo-cygni—An Emerging Pathogen of Barley Crops

An evolutionary ecology perspective to address forest pathology challenges of today and tomorrow

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