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  1. Article: Nutritional niche overlap analysis as a method to identify potential biocontrol fungi against trunk pathogens.

    Wallis, C. M.

    BioControl

    2021  Volume 66, Issue 4, Page(s) 559–571

    Abstract: Fungal physiology; Fungal metabolism; Phenotype microarrays; Plant metabolites; Plant physiology; Resource utilization. ...

    Institution Crop Diseases, Pests and Genetics Research Unit, USDA-ARS San Joaquin Valley Agricultural Sciences Center, 9611 S. Riverbend Ave, Parlier, CA, 93648, USA
    Abstract Fungal physiology; Fungal metabolism; Phenotype microarrays; Plant metabolites; Plant physiology; Resource utilization.
    Language English
    Document type Article
    ZDB-ID 1452737-6
    ISSN 1573-8248 ; 1386-6141
    ISSN (online) 1573-8248
    ISSN 1386-6141
    Database Viticulture and Oenology Abstracts

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  2. Article: Nutritional niche overlap analysis as a method to identify potential biocontrol fungi against trunk pathogens

    Wallis, C. M.

    BioControl. 2021 Aug., v. 66, no. 4

    2021  

    Abstract: Biological control agents possess various mechanisms to limit pathogens including ability to outcompete pathogens for resources and occupy shared niches. However, measuring this competition between putative biocontrol agents and pathogens for the same ... ...

    Abstract Biological control agents possess various mechanisms to limit pathogens including ability to outcompete pathogens for resources and occupy shared niches. However, measuring this competition between putative biocontrol agents and pathogens for the same resources remains difficult. To evaluate carbon and nitrogen source utilization as a measure of competitiveness, we used phenotype microarrays on three endophytes (Trichoderma atroviridae, Trichoderma harzianum and Lecanicillium lecanii) with reported biological control activity and five stem-infecting fungal pathogens (Diplodia seriata, Eutypa lata, Neofusicoccum parvum, Phaeomoniella chlamydospora, and Phaeoacremonium minimum) that infect grapevine and other important woody plant hosts. The faster growing N. parvum and D. seriata utilized a greater number of the 190 assessed carbon and 380 assessed nitrogen sources than the relatively slower growing pathogens E. lata, P. chlamydospora, and P. minimum. All three endophytes had a greater niche overlap of carbon and nitrogen resource use than E. lata and P. chlamydospora. However, only T. harzianum and L. lecanii were determined to be able to equally compete or slightly outcompete N. parvum and D. seriata over carbon or nitrogen sources. Therefore, based on these results involving carbon and nitrogen source niche utilization, T. harzianum and L. lecanii would be advanced to additional biological control agent screening. Furthermore, according to plate bioassays, both Trichoderma spp. exhibited significant growth reduction of all pathogens except P. minimum, and L. lecanii significant reduced growth of D. seriata, E. lata, and N. parvum. Therefore, a combination of direct antagonism and ability to outcompete over resources is important in selecting biocontrols. Regardless, these results demonstrated the capacity of phenotype microarrays to assess the ability of endophytes to outcompete pathogens over shared resources in in vitro conditions as a complement to traditional plate assays.
    Keywords Diplodia seriata ; Eutypa lata ; Lecanicillium lecanii ; Neofusicoccum parvum ; Phaeoacremonium aleophilum ; Phaeoacremonium chlamydospora ; Trichoderma harzianum ; Vitis ; antagonism ; biological control ; biological control agents ; carbon ; endophytes ; fungi ; growth retardation ; microarray technology ; nitrogen ; phenotype ; woody plants
    Language English
    Dates of publication 2021-08
    Size p. 559-571.
    Publishing place Springer Netherlands
    Document type Article
    ZDB-ID 1452737-6
    ISSN 1573-8248 ; 1386-6141
    ISSN (online) 1573-8248
    ISSN 1386-6141
    DOI 10.1007/s10526-021-10091-w
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 1420: Show issues

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  3. Article: Grapevine (Vitis spp.) rootstock stilbenoid associations with host resistance to and induction by root knot nematodes, Meloidogyne incognita

    Wallis, C. M.

    BMC Research Notes

    2020  Volume 13, Issue Art. 360, Page(s) 7 pp.

    Abstract: Objective: The root knot nematodes (RKN) Meloidogyne incognita can severely reduce grapevine yields over time. Grapevine rootstocks have been developed from wild Vitis species that provide resistance to nematode infections. However, the potential ... ...

    Institution USDA-ARS San Joaquin Valley Agricultural Sciences Center, Crop Diseases, Pests and Genetics Research Unit, 9611 S. Riverbend Ave, Parlier, CA, 93648, USA
    Abstract Objective: The root knot nematodes (RKN) Meloidogyne incognita can severely reduce grapevine yields over time. Grapevine rootstocks have been developed from wild Vitis species that provide resistance to nematode infections. However, the potential biochemical or mechanical mechanisms of resistance have not been thoroughly explored. Therefore, this study measured levels of stilbenoids in roots of non-infected and RKN-infected grapevines with Cabernet Sauvignon scion grafted to susceptible (O39-16) or resistant (Freedom) rootstocks. This was part of a larger effort to assess phenolic compound levels within grapevine rootstocks to determine roles of stilbenoid compounds in improving nematode resistance and overall plant health. Results: None of the assessed compounds were consistently greater in RKN infected plants versus healthy controls. Stilbenoids putatively identified as pallidol, ɑ-viniferin, miyabenol C, and hopeaphenol were overall much greater in Freedom than O39-16 rootstocks. By contrast, the stilbenoids ampelopsin A, ω-viniferin, and vitisin B were greater in O39-16 than Freedom. O39-16 and Freedom had similar levels of other stilbenoids especially monomers and dimers. Potentially the greater levels of specific stilbenoids present in Freedom than O39-16 provided RKN resistance. If validated, breeding programs could utilize the increased presence of these compounds as a marker for increased resistance to nematodes.
    Language English
    Document type Article
    ZDB-ID 2413336-X
    ISSN 1756-0500
    ISSN 1756-0500
    DOI 10.1186/s13104-020-05201-3
    Database Viticulture and Oenology Abstracts

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  4. Article: A comparison of the metabolomic response of grapevine to infection with ascomycete wood-infecting fungi

    Galarneau, E. R. A. / Lawrence, D. P. / Wallis, C. M. / Baumgartner, K.

    PMPP Physiological and Molecular Plant Pathology

    2021  Volume 113, Issue Art. 101596, Page(s) 12 pp.

    Abstract: Botryosphaeria dieback; Esca; Eutypa dieback; Grapevine trunk diseases; Primary metabolites; Secondary metabolites. ...

    Institution Department of Plant Pathology, University of California, One Shields Avenue, Davis, CA, 95616, USA
    Abstract Botryosphaeria dieback; Esca; Eutypa dieback; Grapevine trunk diseases; Primary metabolites; Secondary metabolites.
    Language English
    Document type Article
    DOI 10.1016/j.pmpp.2020.101596
    Database Viticulture and Oenology Abstracts

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  5. Article: Grapevine phenolic compounds influence cell surface adhesion of Xylella fastidiosa and bind to lipopolysaccharide

    Lee, S. A. / Wallis, C. M. / Rogers, E. E. / Burbank, L. P.

    PLoS one

    2020  Volume 15, Issue 10, Art. e0240101, Page(s) 14 pp.

    Abstract: Bacterial phytopathogen Xylella fastidiosa specifically colonizes the plant vascular tissue through a complex process of cell adhesion, biofilm formation, and dispersive movement. Adaptation to the chemical environment of the xylem is essential for ... ...

    Institution Crop Diseases, Pests and Genetics Research Unit, USDA, Agricultural Research Service, San Joaquin Valley Agricultural Sciences Center, Parlier, CA, USA
    Abstract Bacterial phytopathogen Xylella fastidiosa specifically colonizes the plant vascular tissue through a complex process of cell adhesion, biofilm formation, and dispersive movement. Adaptation to the chemical environment of the xylem is essential for bacterial growth and progression of infection. Grapevine xylem sap contains a range of plant secondary metabolites such as phenolics, which fluctuate in response to pathogen infection and plant physiological state. Phenolic compounds are often involved in host-pathogen interactions and influence infection dynamics through signaling activity, antimicrobial properties, and alteration of bacterial phenotypes. The effect of biologically relevant concentrations of phenolic compounds coumaric acid, gallic acid, epicatechin, and resveratrol on growth of X. fastidiosa was assessed in vitro. None of these compounds inhibited bacterial growth, but epicatechin and gallic acid reduced cell-surface adhesion. Cell-cell aggregation decreased with resveratrol treatment, but the other phenolic compounds tested had minimal effect on aggregation. Expression of attachment (xadA) and aggregation (fimA) related genes were altered by presence of the phenolic compounds, consistent with observed phenotypes. All four of the phenolic compounds bound to purified X. fastidiosa lipopolysaccharide (LPS), a major cell-surface component. Information regarding the impact of chemical environment on pathogen colonization in plants is important for understanding the infection process and factors associated with host susceptibility.
    Language English
    Document type Article
    ISSN 1932-6203
    Database Viticulture and Oenology Abstracts

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  6. Article: Effects of Grapevine red blotch-associated virus (GRBaV) infection on foliar metabolism of grapevines

    Wallis, C. M. / Sudarshana, M. R.

    Canadian journal of plant pathology

    2016  Volume 38, Issue 3, Page(s) 358

    Document type Article
    ZDB-ID 763044-x
    ISSN 0706-0661 ; 1715-2992
    Database Current Contents Nutrition, Environment, Agriculture

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    In stock of ZB MED Bonn / Germany

    Z 3709: Show issues

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  7. Article: Effects of Grapevine red blotch-associated virus (GRBaV) infection on foliar metabolism of grapevines

    Wallis, C. M. / Sudarshana, M. R.

    Canadian Journal of Plant Pathology

    2016  Volume 38, Issue 3, Page(s) 358–366

    Abstract: amino acids; carbohydrates; phenolics; plant defence responses; terpenoids; virology. ...

    Institution Crop Diseases, Pests and Genetics Research Unit, USDA-ARS San Joaquin Valley Agricultural Sciences Center, 9611 S. Riverbend Ave, Parlier, CA 93648, USA
    Abstract amino acids; carbohydrates; phenolics; plant defence responses; terpenoids; virology.
    Language English ; French
    Document type Article
    ZDB-ID 763044-x
    ISSN 0706-0661 ; 1715-2992
    ISSN 0706-0661 ; 1715-2992
    DOI 10.1080/07060661.2016.1227374
    Database Viticulture and Oenology Abstracts

    Full text online

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  8. Article: Effects of Holding Temperatures on the Development of Zebra Chip Symptoms, ‘Candidatus Liberibacter Solanacearum’ Titers, and Phenolic Levels in ‘Red La Soda’ and ‘Russet Norkotah’ Tubers

    Wallis, C. M / Paetzold, L / Rashed, A / Rush, C. M / Workneh, F

    American journal of potato research. 2017 Aug., v. 94, no. 4

    2017  

    Abstract: Candidatus Liberibacter solanacearum’ (Lso) is the putative causal agent of zebra chip disease (ZC). Late season Lso-infected potatoes that are known to be asymptomatic at harvest may continue to develop symptoms by the time of shipment to consumers. ... ...

    Abstract ‘Candidatus Liberibacter solanacearum’ (Lso) is the putative causal agent of zebra chip disease (ZC). Late season Lso-infected potatoes that are known to be asymptomatic at harvest may continue to develop symptoms by the time of shipment to consumers. This study observed symptom development, Lso titer changes, and changes in symptom-associated phenolic compounds in Lso-infected yet asymptomatic tubers placed at different holding temperatures. ZC symptoms present in freshly-sliced tubers were more severe in ‘Red La Soda’ or ‘Russet Norkotah’ tubers held at 3 °C than at 6 °C or 9 °C. However, Lso titers showed considerable variability in both cultivars over time and at these holding temperatures. Phenolic compound levels, known to be associated with ZC symptom severity, in tubers kept at 3 °C were greater than those kept at 6 °C or 9 °C and increased over time. These results demonstrate that ZC could develop in tubers kept in cold storage, with those kept at 3 °C having more ZC development than those kept at 6 °C or 9 °C.
    Keywords Candidatus Liberibacter solanacearum ; cold storage ; cultivars ; phenolic compounds ; potatoes ; storage temperature ; tubers ; zebra chip disease
    Language English
    Dates of publication 2017-08
    Size p. 334-341.
    Publishing place Springer US
    Document type Article
    ISSN 1099-209X
    DOI 10.1007/s12230-017-9569-1
    Database NAL-Catalogue (AGRICOLA)

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  9. Article: Effects of energy reserves and diet on glassy-winged sharpshooter egg maturation

    Sisterson, M. S. / Krugner, R. / Wallis, C. M. / Stenger, D. C.

    Journal of Economic Entomology

    2018  Volume 111, Issue 1, Page(s) 159–169

    Abstract: Xylella fastidiosa*; *Homalodisca vitripennis*; Cicadellidae. ...

    Institution USDA, Agricultural Research Service, San Joaquin Valley Agricultural Sciences Center, 9611 South Riverbend Avenue, Parlier, CA 93648-9757, USA
    Abstract *Xylella fastidiosa*; *Homalodisca vitripennis*; Cicadellidae.
    Language English
    Document type Article
    ZDB-ID 3031-4
    ISSN 0022-0493
    ISSN 0022-0493
    DOI 10.1093/jee/tox314
    Database Viticulture and Oenology Abstracts

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  10. Article ; Online: Examining the Potential Role of Foliar Chemistry in Imparting Potato Germplasm Tolerance to Potato Psyllid, Green Peach Aphid, and Zebra Chip Disease.

    Prager, S M / Wallis, C M / Jones, M / Novy, R / Trumble, J T

    Journal of economic entomology

    2017  Volume 111, Issue 1, Page(s) 327–336

    Abstract: Long-term, sustainable management of zebra chip disease of potato, caused by 'Candidatus Liberibacter solanacearum' (Lso) and vectored by potato psyllids (Bactericera cockerelli Sulc [Hemiptera: Triozidae]), requires development of cultivars resistant or ...

    Abstract Long-term, sustainable management of zebra chip disease of potato, caused by 'Candidatus Liberibacter solanacearum' (Lso) and vectored by potato psyllids (Bactericera cockerelli Sulc [Hemiptera: Triozidae]), requires development of cultivars resistant or tolerant to infection or capable of reducing spread or both. We examined the influence that five experimental breeding clones of potato had on potato psyllids and their ability to vector Lso. The ability of these potato clones to resist aphids (green peach aphids, Myzus persicae Sulzer [Hemiptera: Aphididae]) also was examined. Due to the importance of host chemistry on plant-insect interactions, levels of primary metabolites of amino acids and sugars, as well as secondary metabolites including polyphenolics, terpenoids, and alkaloids were compared between breeding clones and a commercial cultivar. Findings for compound levels then were associated with observed changes in host susceptibility to psyllids or aphids. Psyllids oviposited less on three breeding clones than Atlantic, but no significant effects of breeding clones on psyllid feeding or choice were observed. Aphid reproduction was reduced on two clones relative to Atlantic. A05379-211 had greater sugar levels and postpsyllid amino acid levels than Atlantic. Total alkaloid and phenolic levels were greater in all breeding clones than Atlantic. Total terpenoid levels were greater in PALB03016-3 and PALB03016-6 than Atlantic, which might explain, in part, the observed resistance to psyllid oviposition and aphid reproduction. Overall, these results suggest that increased levels of certain metabolites in breeding clones could affect psyllid and aphid reproduction.
    MeSH term(s) Animals ; Antibiosis ; Aphids/physiology ; Hemiptera/physiology ; Herbivory ; Plant Diseases/microbiology ; Plant Leaves/chemistry ; Plant Leaves/microbiology ; Plant Leaves/physiology ; Rhizobiaceae/physiology ; Solanum tuberosum/chemistry ; Solanum tuberosum/genetics ; Solanum tuberosum/microbiology ; Solanum tuberosum/physiology
    Language English
    Publishing date 2017-11-22
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 3031-4
    ISSN 1938-291X ; 0022-0493
    ISSN (online) 1938-291X
    ISSN 0022-0493
    DOI 10.1093/jee/tox255
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 1118: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)

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