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Annual Review of Phytopathology

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https://www.readbyqxmd.com/read/28637378/surveillance-to-inform-control-of-emerging-plant-diseases-an-epidemiological-perspective
#1
Stephen Parnell, Frank van den Bosch, Tim Gottwald, Christopher A Gilligan
The rise in emerging pathogens and strains has led to increased calls for more effective surveillance in plant health. We show how epidemiological insights about the dynamics of disease spread can improve the targeting of when and where to sample. We outline some relatively simple but powerful statistical approaches to inform surveillance and describe how they can be adapted to include epidemiological information. This enables us to address questions such as: Following the first report of an invading pathogen, what is the likely incidence of disease? If no cases of disease have been found, how certain can we be that the disease was not simply missed by chance? We illustrate the use of spatially explicit stochastic models to optimize targeting of surveillance and control resources...
June 21, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28637377/the-candidatus-liberibacter-host-interface-insights-into-pathogenesis-mechanisms-and-disease-control
#2
Nian Wang, Elizabeth A Pierson, João Carlos Setubal, Jin Xu, Julien G Levy, Yunzeng Zhang, Jinyun Li, Luiz Thiberio Rangel, Joaquim Martins
"Candidatus Liberibacter" species are associated with economically devastating diseases of citrus, potato, and many other crops. The importance of these diseases as well as the proliferation of new diseases on a wider host range is likely to increase as the insects vectoring the "Ca. Liberibacter" species expand their territories worldwide. Here, we review the progress on understanding pathogenesis mechanisms of "Ca. Liberibacter" species and the control approaches for diseases they cause. We discuss the Liberibacter virulence traits, including secretion systems, putative effectors, and lipopolysaccharides (LPSs), as well as other important traits likely to contribute to disease development, e...
June 21, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28617655/adapted-biotroph-manipulation-of-plant-cell-ploidy
#3
Mary C Wildermuth, Michael A Steinwand, Amanda G McRae, Johan Jaenisch, Divya Chandran
Diverse plant biotrophs that establish a sustained site of nutrient acquisition induce localized host endoreduplication. Endoreduplication is a process by which cells successively replicate their genomes without mitosis, resulting in an increase in nuclear DNA ploidy. Elevated ploidy is associated with enhanced cell size, metabolic capacity, and the capacity to differentiate. Localized host endoreduplication induced by adapted plant biotrophs promotes biotroph colonization, development, and/or proliferation...
June 15, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28617654/function-discovery-and-exploitation-of-plant-pattern-recognition-receptors-for-broad-spectrum-disease-resistance
#4
Freddy Boutrot, Cyril Zipfel
Plants are constantly exposed to would-be pathogens and pests, and thus have a sophisticated immune system to ward off these threats, which otherwise can have devastating ecological and economic consequences on ecosystems and agriculture. Plants employ receptor kinases (RKs) and receptor-like proteins (RLPs) as pattern recognition receptors (PRRs) to monitor their apoplastic environment and detect non-self and damaged-self patterns as signs of potential danger. Plant PRRs contribute to both basal and non-host resistances, and treatment with pathogen-/microbe-associated molecular patterns (PAMPs/MAMPs) or damage-associated molecular patterns (DAMPs) recognized by plant PRRs induces both local and systemic immunity...
June 15, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28613977/the-scientific-economic-and-social-impacts-of-the-new-zealand-outbreak-of-bacterial-canker-of-kiwifruit-pseudomonas-syringae-pv-actinidiae
#5
Joel L Vanneste
The introduction of Pseudomonas syringae pv. actinidiae (Psa) severely damaged the New Zealand kiwifruit industry, which in 2010 was based on only two cultivars. Despite an extraordinarily quick and strong response by industry, government, and scientists to minimize the economic and social impacts, the economic consequences of this outbreak were severe. Although our understanding of Psa epidemiology and control methods increased substantively over the past six years, the kiwifruit industry largely recovered because of the introduction of a less-susceptible yellow-fleshed cultivar...
June 14, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28598721/iron-and-immunity
#6
Eline H Verbon, Pauline L Trapet, Ioannis A Stringlis, Sophie Kruijs, Peter A H M Bakker, Corné M J Pieterse
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...
June 9, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28590879/tritrophic-interactions-microbe-mediated-plant-effects-on-insect-herbivores
#7
Ikkei Shikano, Cristina Rosa, Ching-Wen Tan, Gary W Felton
It is becoming abundantly clear that the microbes associated with plants and insects can profoundly influence plant-insect interactions. Here, we focus on recent findings and propose directions for future research that involve microbe-induced changes to plant defenses and nutritive quality as well as the consequences of these changes for the behavior and fitness of insect herbivores. Insect (herbivore and parasitoid)-associated microbes can favor or improve insect fitness by suppressing plant defenses and detoxifying defensive phytochemicals...
June 7, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28590878/tick-tock-circadian-regulation-of-plant-innate-immunity
#8
Hua Lu, C Robertson McClung, Chong Zhang
Many living organisms on Earth have evolved the ability to integrate environmental and internal signals to determine time and thereafter adjust appropriately their metabolism, physiology, and behavior. The circadian clock is the endogenous timekeeper critical for multiple biological processes in many organisms. A growing body of evidence supports the importance of the circadian clock for plant health. Plants activate timed defense with various strategies to anticipate daily attacks of pathogens and pests and to modulate responses to specific invaders in a time-of-day-dependent manner (gating)...
June 7, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28590877/genome-evolution-of-plant-parasitic-nematodes
#9
Taisei Kikuchi, Sebastian Eves-van den Akker, John T Jones
Plant parasitism has evolved independently on at least four separate occasions in the phylum Nematoda. The application of next-generation sequencing (NGS) to plant-parasitic nematodes has allowed a wide range of genome- or transcriptome-level comparisons, and these have identified genome adaptations that enable parasitism of plants. Current genome data suggest that horizontal gene transfer, gene family expansions, evolution of new genes that mediate interactions with the host, and parasitism-specific gene regulation are important adaptations that allow nematodes to parasitize plants...
June 7, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28590876/cucumber-green-mottle-mosaic-virus-rapidly-increasing-global-distribution-etiology-epidemiology-and-management
#10
Aviv Dombrovsky, Lucy T T Tran-Nguyen, Roger A C Jones
Cucumber green mottle mosaic virus (CGMMV) was first described in 1935 infecting cucumber, making it one of the first plant viruses to be described. Its initial distribution occurred out of England to other countries. This was followed by its subsequent distribution from England and these other countries. This process increased slowly between 1935 and 1985, faster between 1986 and 2006, and rapidly between 2007 and 2016. The discovery that it diminished cucurbit fruit yields and quality, especially of watermelon, prompted a substantial research effort in worst-affected countries...
June 7, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28637398/what-do-we-know-about-nod-like-receptors-in-plant-immunity
#11
Xiaoxiao Zhang, Peter N Dodds, Maud Bernoux
The first plant disease resistance (R) genes were identified and cloned more than two decades ago. Since then, many more R genes have been identified and characterized in numerous plant pathosystems. Most of these encode members of the large family of intracellular NLRs (NOD-like receptors), which also includes animal immune receptors. New discoveries in this expanding field of research provide new elements for our understanding of plant NLR function. But what do we know about plant NLR function today? Genetic, structural, and functional analyses have uncovered a number of commonalities and differences in pathogen recognition strategies as well as how NLRs are regulated and activate defense signaling, but many unknowns remain...
May 22, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28525309/from-chaos-to-harmony-responses-and-signaling-upon-microbial-pattern-recognition
#12
Xiao Yu, Baomin Feng, Ping He, Libo Shan
Pathogen- or microbe-associated molecular patterns (PAMPs/MAMPs) are detected as nonself by host pattern recognition receptors (PRRs) and activate pattern-triggered immunity (PTI). Microbial invasions often trigger the production of host-derived endogenous signals referred to as dangeror damage-associated molecular patterns (DAMPs), which are also perceived by PRRs to modulate PTI responses. Collectively, PTI contributes to host defense against infections by a broad range of pathogens. Remarkable progress has been made toward demonstrating the cellular and physiological responses upon pattern recognition, elucidating the molecular, biochemical, and genetic mechanisms of PRR activation as well as dissecting the complex signaling networks that orchestrate PTI responses...
May 19, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28525308/toxin-antitoxin-systems-implications-for-plant-disease
#13
T Shidore, L R Triplett
Toxin-antitoxin (TA) systems are gene modules that are ubiquitous in freeliving prokaryotes. Diverse in structure, cellular function, and fitness roles, TA systems are defined by the presence of a toxin gene that suppresses bacterial growth and a toxin-neutralizing antitoxin gene, usually encoded in a single operon. Originally viewed as DNA maintenance modules, TA systems are now thought to function in many roles, including bacterial stress tolerance, virulence, phage defense, and biofilm formation. However, very few studies have investigated the significance of TA systems in the context of plant-microbe interactions...
May 19, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28525307/exploiting-genetic-information-to-trace-plant-virus-dispersal-in-landscapes
#14
Coralie Picard, Sylvie Dallot, Kirstyn Brunker, Karine Berthier, Phillipe Roumagnac, Samuel Soubeyrand, Emmanuel Jacquot, Gaël Thébaud
During the past decade, knowledge of pathogen life history has greatly benefited from the advent and development of molecular epidemiology. This branch of epidemiology uses information on pathogen variation at the molecular level to gain insights into a pathogen's niche and evolution and to characterize pathogen dispersal within and between host populations. Here, we review molecular epidemiology approaches that have been developed to trace plant virus dispersal in landscapes. In particular, we highlight how virus molecular epidemiology, nourished with powerful sequencing technologies, can provide novel insights at the crossroads between the blooming fields of landscape genetics, phylogeography, and evolutionary epidemiology...
May 19, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28525306/targeting-fungicide-inputs-according-to-need
#15
Lise N Jørgensen, F van den Bosch, R P Oliver, T M Heick, N Paveley
Fungicides should be used to the extent required to minimize economic costs of disease in a given field in a given season. The maximum number of treatments and maximum dose per treatment are set by fungicide manufacturers and regulators at a level that provides effective control under high disease pressure. Lower doses are economically optimal under low or moderate disease pressure, or where other control measures such as resistant cultivars constrain epidemics. Farmers in many countries often apply reduced doses, although they may still apply higher doses than the optimum to insure against losses in high disease seasons...
May 19, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28504920/silicon-s-role-in-abiotic-and-biotic-plant-stresses
#16
Daniel Debona, Fabrício A Rodrigues, Lawrence E Datnoff
Silicon (Si) plays a pivotal role in the nutritional status of a wide variety of monocot and dicot plant species and helps them, whether direct or indirectly, counteract abiotic and/or biotic stresses. In general, plants with a high root or shoot Si concentration are less prone to suffer from pest attack and exhibit enhanced tolerance to abiotic stresses such as drought, low temperature, or metal toxicity. However, the most notable effect of Si is the reduction in the intensities of a number of seedborne, soilborne, and foliar diseases in many economically important crops that are caused by biotrophic, hemibiotrophic, and necrotrophic plant pathogens...
May 15, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28489499/the-evidential-basis-of-decision-making-in-plant-disease-management
#17
Gareth Hughes
The evidential basis for disease management decision making is provided by data relating to risk factors. The decision process involves an assessment of the evidence leading to taking (or refraining from) action on the basis of a prediction. The primary objective of the decision process is to identify-at the time the decision is made-the control action that provides the best predicted end-of-season outcome, calculated in terms of revenue or another appropriate metric. Data relating to disease risk factors may take a variety of forms (e...
May 10, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28489498/fusarium-oxysporum-and-the-fusarium-wilt-syndrome
#18
Thomas R Gordon
The Fusarium oxysporum species complex (FOSC) comprises a multitude of strains that cause vascular wilt diseases of economically important crops throughout the world. Although sexual reproduction is unknown in the FOSC, horizontal gene transfer may contribute to the observed diversity in pathogenic strains. Development of disease in a susceptible crop requires F. oxysporum to advance through a series of transitions, beginning with spore germination and culminating with establishment of a systemic infection...
May 10, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/28489497/ecology-and-genomic-insights-on-plant-pathogenic-and-nonpathogenic-endophytes
#19
Günter Brader, Stéphane Compant, Kathryn Vescio, Birgit Mitter, Friederike Trognitz, Li-Jun Ma, Angela Sessitsch
Plants are colonized on their surfaces and in the rhizosphere and phyllosphere by a multitude of different microorganisms and are inhabited internally by endophytes. Most endophytes act as commensals without any known effect on their plant host, but multiple bacteria and fungi establish a mutualistic relationship with plants, and some act as pathogens. The outcome of these plant-microbe interactions depends on biotic and abiotic environmental factors and on the genotype of the host and the interacting microorganism...
May 10, 2017: Annual Review of Phytopathology
https://www.readbyqxmd.com/read/27491436/dna-methylation-and-demethylation-in-plant-immunity
#20
A Deleris, T Halter, L Navarro
Detection of plant and animal pathogens triggers a massive transcriptional reprogramming, which is directed by chromatin-based processes, and ultimately results in antimicrobial immunity. Although the implication of histone modifications in orchestrating biotic stress-induced transcriptional reprogramming has been well characterized, very little was known, until recently, about the role of DNA methylation and demethylation in this process. In this review, we summarize recent findings on the dynamics and biological relevance of DNA methylation and demethylation in plant immunity against nonviral pathogens...
August 4, 2016: Annual Review of Phytopathology
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