Interactions between foliar diseases: concepts and epidemiological approaches

Jesús, Waldir Cintra de; Júnior, Trazilbo J. Paula; Lehner, Miller da Silva; Hau, B.

doi:10.1590/s1982-56762014000100002

Cited by 11 publications

(4 citation statements)

References 112 publications

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“…Despite this, little is known about how these pathogens interact when simultaneously infecting the roots of their host. Antagonistic interactions may occur if PRRC pathogens compete for the same resources (Jesus Junior et al ., ). For example, interspecific competition has been observed between some Fusarium spp.…”

Section: Introductionmentioning

confidence: 97%

“…Alternatively, pathogens may avoid competition by occupying different spatial or temporal niches within the root system, resulting in additive or neutral interactions. Finally, mutualistic and commensalistic interactions can synergistically increase the severity of disease symptoms (Jesus Junior et al ., ). Interspecific interactions between plant pathogens may increase disease pressure, complicate diagnoses and make yield loss difficult to predict (Jesus Junior et al ., ).…”

Section: Introductionmentioning

confidence: 97%

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Detection of interactions between the pea root rot pathogens Aphanomyces euteiches and Fusarium spp. using a multiplex qPCR assay

et al. 2018

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Pea root rot complex (PRRC) describes a group of closely associated soilborne pathogens that cause root rot disease in field pea. Aphanomyces euteiches and several Fusarium spp. are the most prevalent and damaging microorganisms within this complex, although the impact of interspecific interactions on disease progression remains largely unexplored. Furthermore, a fast and reliable method of detecting and quantifying these pathogens is not currently available. The objectives of this experiment were to: (i) investigate the effect of microbial interactions on root rot severity in pea under greenhouse conditions; and (ii) characterize changes in colonization rates when multiple pathogens are present using qPCR. Seeds were exposed to three species of Fusarium and were planted into A. euteiches‐infested soil in varying combinations. For each experimental treatment, an index of disease severity was used to visually rate disease symptoms. Additionally, two triplex quantitative PCR (qPCR) assays were designed to detect and quantify changes in pathogen population dynamics on the roots. Both assays demonstrated a high degree of sensitivity and efficiency. Results from two independent greenhouse trials indicated an increase in disease severity in the presence of multiple pathogen species compared to single inoculations. Specifically, roots infected with A. euteiches were more susceptible to fusarium root rot than those exposed only to Fusarium spp. These observations were confirmed by qPCR results, which revealed significant changes in colonization rates when multiple species were present. These findings suggest an increased risk of yield loss in regions where A. euteiches and Fusarium spp. co‐occur.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Detection of interactions between the pea root rot pathogens Aphanomyces euteiches and Fusarium spp. using a multiplex qPCR assay

et al. 2018

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“…Indeed, Z. tritici is able to undergo anastomosis between germinating spores when they are deposited on the leaf close to each other (Mehrabi et al ., ). Spores may also interact in more subtle ways, as was observed in other foliar plant pathogens (Jeffries, ; Jesus Junior et al ., ). For example, when two spores penetrate the leaf surface at nearby locations, the probability of lesion formation may become higher (cooperation) or lower (antagonism) than twice the probability of a lesion being formed by an individual spore that is far away from other spores.…”

Section: Discussionmentioning

confidence: 97%

Measurement of infection efficiency of a major wheat pathogen using time‐resolved imaging of disease progress

2018

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Infection efficiency is a key epidemiological parameter that determines the proportion of pathogen spores able to infect and cause lesions once they have landed on a susceptible plant tissue. In this study, an improved method to measure infection efficiency of Zymoseptoria tritici using a replicated greenhouse experiment is presented. Zymoseptoria tritici is a fungal pathogen that infects wheat leaves and causes septoria tritici blotch (STB), a major disease of wheat worldwide. A novel experimental setup was devised, where living wheat leaves were attached to metal plates, allowing for time‐resolved imaging of disease progress in planta. Because lesions were continuously appearing, expanding and merging during the period of up to 3 weeks, daily measurements were necessary for accurate counting of lesions. Reference membranes were also used to characterize the density and spatial distribution of spores inoculated onto leaf surfaces. In this way, the relationship between the number of lesions and the number of viable spores deposited on the leaves was captured and an infection efficiency of about 4% was estimated from the slope of this relationship. This study provides a proof of principle for accurate and reliable measurement of infection efficiency of Z. tritici. The method opens opportunities for determining the genetic basis of the component of quantitative resistance that suppresses infection efficiency. This knowledge would improve breeding for quantitative resistance against STB, a control measure considered more durable than deployment of major resistance genes.

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“…; Jesus Junior et al. , ; Lopes and Berger ), but their importance has been demonstrated in only a few cases. Some of these interactions involving anthracnose, caused by Colletotrichum lindemuthianum (Sacc.…”

Section: Introductionmentioning

confidence: 99%

Interactions Between Rhizoctonia Root Rot and the Foliar Common Bean Diseases Anthracnose and Rust

Júnior

Jesús

Admassu

et al. 2015

Journal of Phytopathology

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The effects of co-inoculation of Rhizoctonia solani and Colletotrichum lindemuthianum or Uromyces appendiculatus at different inoculum levels were studied on the disease dynamics and on the growth of bean plants under greenhouse conditions. Bean seeds were sown in R. solani-infested soil. Additional experiments in which seedlings were transplanted to infested soil were also carried out. Conidial suspensions of C. lindemuthianum or uredospores of U. appendiculatus were inoculated onto leaves at plant developmental stages V2 and V3, respectively. Interactions between root rot and the aerial diseases were observed depending on the inoculum levels and on the timing of R. solani inoculation. Anthracnose severity tended to be higher on R. solani-infected plants. Conversely, R. solani infection significantly reduced diameter of pustules and rust severity. When seedlings were transplanted to soil infested with low levels of R. solani, root rot severity and density of R. solani in the soil were magnified at high levels of C. lindemuthianum or U. appendiculatus. In these experiments, a synergistic interaction between root rot and anthracnose was observed to affect the plant dry weight. Antagonistic effects on the plant dry weight were found for the combination root rot/rust only when seeds were sown in infested soil.

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Interactions between foliar diseases: concepts and epidemiological approaches

Cited by 11 publications

References 112 publications

Detection of interactions between the pea root rot pathogens Aphanomyces euteiches and Fusarium spp. using a multiplex qPCR assay

Detection of interactions between the pea root rot pathogens Aphanomyces euteiches and Fusarium spp. using a multiplex qPCR assay

Measurement of infection efficiency of a major wheat pathogen using time‐resolved imaging of disease progress

Interactions Between Rhizoctonia Root Rot and the Foliar Common Bean Diseases Anthracnose and Rust

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