Differential Interactions ofPratylenchus crenatus, P. penetrans,andP. scribneriwithVerticillium dahliaein Potato Early Dying Disease

Riedel, R. M.; Rowe, R. C.; Martin, Michel

doi:10.1094/phyto-75-419

Cited by 42 publications

(21 citation statements)

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“…Nematode reproduction, however, increased to potentially pathogenic levels (Bergeson, 1963; Faulkner & Skotland, 1965; Faulkner & Bolander, 1969) in coinfected peppermint plants, and therefore enhanced disease may have resulted from the additive damage inflicted by both pathogens and not necessarily nematode‐induced susceptibility to the fungus. While the peppermint double‐root study (Faulkner et al ., 1970) is the most cited study of induced susceptibility of a host to V. dahliae by Pratylenchus , scientists are critical of the putative role of the nematode in PED (Riedel et al ., 1985; MacGuidwin & Rouse, 1990; Taylor, 1990; Saeed et al ., 1997a; Gent et al ., 1999; Rowe & Powelson, 2002).…”

Section: Introductionmentioning

confidence: 99%

Interaction of spatially separated Pratylenchus penetrans and Verticillium dahliae on potato measured by impaired photosynthesis

et al. 2004

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Experiments were conducted under growth-chamber conditions to determine if Pratylenchus penetrans systemically alters light use efficiency (LUE) of Russet Burbank potato infected by Verticillium dahliae. Pathogen separation was achieved by inoculating potato roots with the nematode prior to injecting fungal conidia into the stem vasculature. Treatments were P. penetrans alone, V. dahliae alone, nematode and fungus together, and a no-pathogen control. Gas exchange was repeatedly and nondestructively measured on the fifth-youngest leaf with a Li-Cor LI-6200 portable photosynthesis system. By 16 and 20 days after stem injection with the fungus, LUE was synergistically impaired in jointly infected plants. Transpiration in plants infected with both pathogens was significantly reduced. However, the combined effect of nematode and fungus was synergistic in one experiment and additive in the other. Stems were destructively harvested when LUE was synergistically impaired. Coinfected potato plants contained more colony-forming units (CFU) of V. dahliae in stem sap than those infected by the fungus alone in one experiment. Evidence is provided that infection of Russet Burbank roots by P. penetrans systemically affects disease physiology associated with stem vascular infection by V. dahliae. The findings indicate that the role of the nematode in the fungus/ host interaction is more than simply to facilitate extravascular and /or vascular entry of the fungus into potato roots.

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Section: Introductionmentioning

confidence: 99%

Interaction of spatially separated Pratylenchus penetrans and Verticillium dahliae on potato measured by impaired photosynthesis

et al. 2004

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“…Infected plants die prematurely, leading to serious economic losses. As population densities of V. dahliae in soil increase, disease becomes more severe and yields decline (Harris and Yang 1996;Paplomatas et al 1992;Wheeler et al 1992;Francl et al 1987Francl et al , 1988Nicot and Rouse 1987a;Riedel et al 1985;Davis et al 1983;Pullman and DeVay 1982;Ashworth et al 1979;Grogan et al 1979;Nnodu and Harrison 1979;Lacy and Horner 1965). Estimates of population density of the fungus in soil are therefore vital to many activities related to understanding and managing verticillium wilt, including predicting disease, recommending action (e.g., fumigation, rotation, cultivar selection), monitoring the impact of disease control practices on inoculum, and studying the ecology of the fungus and the epidemiology of the diseases it causes.…”

Section: Introductionmentioning

confidence: 99%

Accuracy and precision of population estimates of Verticillium dahliae on growth media in quantitative soil assays

Mpofu¹,

Hall²

2003

Can. J. Bot.

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Verticillium dahliae Kleb. is a serious pathogen of many plant species. Growth media used to measure population density of V. dahliae in soil were evaluated for high recovery of the pathogen, as well as accuracy and precision of population estimates from naturally and artificially infested sandy loam soil using the soil dilution method. Recovery of V. dahliae from naturally infested field soil was highest on soil pectate Tergitol agar (SPT), soil extract agar + sodium polypectate (SEAP), modified pectate agar (MPA), potato dextrose agar + streptomycin sulphate (PDAS), and Talboys' prune lactose agar (TPA); however, PDAS and TPA were overgrown with contaminating fungi, making enumeration difficult. Use of SPT medium resulted in the most precise population estimate with a standard error (SE) of 12.6% of the mean followed by use of pectate agar (PA) (SE = 14.8%) and SEAP (SE = 19.1%). Ethanol, biotin, and Dox salts enhanced recovery of V. dahliae from naturally infested soil, but combining Dox salts with ethanol and biotin significantly reduced population density. Soil extract had no significant effects on population density. Accuracy of V. dahliae population estimates from sterile artificially inoculated soil was highest on modified soil extract agar (MSEA) (64%) followed by SPT (58%). However, accuracy of V. dahliae population estimates from nonsterile artificially inoculated soil was highest on SPT (36%). Soil extract is not an essential ingredient and biotin may increase recovery of V. dahliae from soil. Résumé :Le Verticillium dahliae Kleb. est un virulent pathogène chez plusieurs espèces de plantes. Les milieux de culture utilisés pour mesurer la densité des populations du V. dahliae dans le sol, ont été analysées en utilisant la mé-thode de dilution de sol, afin de déterminer le maximum de détection du pathogène, ainsi que l'exactitude et la préci-sion des estimés de population de sables loameux, naturellement ou artificiellement infectés. La quantité de propagules du V. dahliae détectées à partir de sols de prairie naturellement infectés est plus élevée sur les géloses à base de sol et de pectate tergitol (SPT), extrait de sol gélosé avec polypectate de sodium (SEAP), pectate gélosé modifié (MPA), gé-lose avec dextrose et pomme de terre additionnée de sulfate de streptomycine (PDAS), et gélose de Talboy à base de lactose de prune (TPA); on note que les PDAS et TPA sont envahis par des contaminants fongiques qui rendent l'énumération difficile. L'utilisation du SPT fournit les estimations de populations les plus précises, avec une déviation standard (SE) de 12,6 % par rapport à la moyenne, suivi de l'utilisation du PA (SE = 14,8 %) et du SEAP (SE = 19,1 %). L'éthanol, la biotine et les sels Dox augmentent la détection du V. dahliae à partir de sols naturellement infectés, mais la combinaison des sels Dox avec l'éthanol et la biotine diminue significativement la densité de population. L'exactitude des estimations des populations du V. dahliae, à partir de sol stérilisés et inoculés artificiellement, est plus é...

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“…Evidence also indicates that this interaction is specific to certain species of Pratylenchus, P. penetrans being the most important (74). Recent studies with several isolates of V. dahliae representing two distinct pathotypes on potato indicate further that only certain strains of the fungus may be involved in the interaction (D. D. Botseas & R. C. Rowe, unpublished data).…”

Section: Symptoms and Effects On Yieldmentioning

confidence: 98%

“…Synergistic interactions between fungi that cause wilts and nematodes are well documented for several crops (5, 54,60,71,83). Detailed field microplot studies on PED conducted in Ohio (57,74,78) and Wisconsin (51, 53) have demonstrated conclusively the involvement of root-lesion nematodes in PED. Data from studies in Ohio over the past 10 years have shown consistent patterns in which V. dahliae and P. penetrans interact synergistically.…”

Section: Symptoms and Effects On Yieldmentioning

confidence: 99%

Biology and Management of Early Dying of Potatoes

Powelson¹,

Rowe²

1993

Annu. Rev. Phytopathol.

141

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Differential Interactions ofPratylenchus crenatus, P. penetrans,andP. scribneriwithVerticillium dahliaein Potato Early Dying Disease

Cited by 42 publications

References 0 publications

Interaction of spatially separated Pratylenchus penetrans and Verticillium dahliae on potato measured by impaired photosynthesis

Interaction of spatially separated Pratylenchus penetrans and Verticillium dahliae on potato measured by impaired photosynthesis

Accuracy and precision of population estimates of Verticillium dahliae on growth media in quantitative soil assays

Biology and Management of Early Dying of Potatoes

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