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  1. Article: First Report of Rust Caused by

    Visser, Botma / Boshoff, Willem H P / Pretorius, Zacharias A

    Plant disease

    2024  

    Abstract: Phakopsora ... ...

    Abstract Phakopsora nishidana
    Language English
    Publishing date 2024-04-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-12-23-2794-PDN
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Wheat Stem Rust Surveillance Reveals Two New Races of

    Terefe, Tarekegn G / Boshoff, Willem H P / Park, Robert F / Pretorius, Zacharias A / Visser, Botma

    Plant disease

    2024  Volume 108, Issue 1, Page(s) 20–29

    Abstract: Stem rust, caused ... ...

    Abstract Stem rust, caused by
    MeSH term(s) South Africa ; Plant Diseases ; Disease Resistance/genetics ; Plant Breeding ; Basidiomycota/physiology ; Puccinia
    Language English
    Publishing date 2024-01-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-06-23-1120-SR
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Flagging defensive roles of carbohydrate-active enzymes (CAZymes) and carbohydrates during Puccinia triticina-wheat interactions

    Mafa, Mpho S. / Visser, Botma / Boshoff, Willem H.P. / Kemp, Gabre / Alexander, Orbett / Castelyn, Howard D.

    Physiological and Molecular Plant Pathology. 2023 Mar., v. 124 p.101947-

    2023  

    Abstract: Puccinia triticina (Pt) infects wheat, leading to colonization of leaf tissues, pustule formation on the leaf and eventually yield loss. Fungicides and breeding techniques are used to manage Pt infection in wheat. However, there is a growing need for ... ...

    Abstract Puccinia triticina (Pt) infects wheat, leading to colonization of leaf tissues, pustule formation on the leaf and eventually yield loss. Fungicides and breeding techniques are used to manage Pt infection in wheat. However, there is a growing need for biochemical studies to identify critical metabolites and proteins that contribute to plant susceptibility or resistance against Pt. The current study investigated defensive role of non-structural, structural carbohydrates, and CAZymes during Pt-wheat interaction at 1, 7, and 14 days post inoculation (dpi). The results revealed that glucose, total reducing sugars and sucrose were significantly decreased by more than 50% in Pt inoculated susceptible Thatcher (IS) plants. Sucrose concentrations decreased by 0.80 and 0.93 fold in IS compared to control sample (CS) at 1 and 7 dpi. Pt inoculated resistant Thatcher + Lr9 (IR) plants and control (CR) did not display differences in soluble carbohydrate concentrations. In addition, exoglucanase, endoglucanase, pectinase and carbohydrate esterase activities were significantly higher at 1 or 7 dpi in IS compared to IR plants. The cellulose-content was 29% in IR samples compared to 15% in CR samples at 14 dpi. Additionally, hemicellulose increased by 2% in IR at 14 dpi. The cell wall reinforcements in resistant plants were supported by Fourier transformation infrared results that revealed that IR holocellulose content was not affected by Pt infection, but IS samples holocellulose decreased at 7 dpi. In conclusion, increased activities of CAZymes, decreased cell wall holocellulose content, and reduced soluble carbohydrates were susceptibility indicators.
    Keywords Puccinia recondita ; cell walls ; endo-1,4-beta-glucanase ; esterases ; glucose ; hemicellulose ; leaves ; metabolites ; plant pathology ; polygalacturonase ; sucrose ; wheat ; Leaf rust ; Carbohydrate-active enzymes ; Carbohydrates ; Wheat-Pt interaction
    Language English
    Dates of publication 2023-03
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 742470-x
    ISSN 0885-5765
    ISSN 0885-5765
    DOI 10.1016/j.pmpp.2023.101947
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  4. Article: Development of a Diagnostic Assay for Differentiation Between Genetic Groups in Clades I, II, III, and IV of Puccinia graminis f. sp. tritici

    Szabo, Les J. / Olivera, Pablo D. / Wanyera, Ruth / Visser, Botma / Jin, Yue

    Plant disease. 2022 Aug. 01, v. 106, no. 8

    2022  

    Abstract: Wheat stem rust has reemerged as a serious disease caused by new variants of Puccinia graminis f. sp. tritici. Variants with significant virulence and broad geographic distribution (Africa, Central Asia, and Europe) include the Ug99 race group, race ... ...

    Abstract Wheat stem rust has reemerged as a serious disease caused by new variants of Puccinia graminis f. sp. tritici. Variants with significant virulence and broad geographic distribution (Africa, Central Asia, and Europe) include the Ug99 race group, race TTRTF, and TKTTF race group. Genetic analysis has placed isolates representing these critical new virulent races into 12 genetic groups that make up clades I to IV. Development of molecular diagnostic assays for these 12 genetic groups will be an important component of global surveillance efforts. A single-nucleotide polymorphism database was mined for candidate markers that would differentiate between these 12 genetic groups. Thirty-five candidate markers were screened, and a core set of 17 markers was tested against a set of 94 isolates representing a broad range of genotypes and race phenotypes. These core markers were 100% accurate in identifying the 12 genetic groups for 52 isolates in clades I to IV, and no false positives were observed with nontarget isolates. The assay has built-in redundancy so that minor genetic changes or errors in genotyping calling will not affect the accuracy of the results. This assay is also effective in identifying the genetic groups in clade V from Germany and Georgia, the three main subgroups in North American clade VI, and clade VII consisting of race TTTTF found in North and South America. This assay provides a rapid diagnostic tool for both living and nonliving samples to detect these critical new races or race groups of P. graminis f. sp. tritici. Copyright © 2022 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
    Keywords Puccinia graminis ; databases ; diagnostic techniques ; genetic analysis ; genotyping ; geographical distribution ; monitoring ; single nucleotide polymorphism ; stem rust ; virulence ; wheat ; Africa ; Central Asia ; Georgia ; Germany ; South America
    Language English
    Dates of publication 2022-0801
    Size p. 2211-2220.
    Publishing place The American Phytopathological Society
    Document type Article
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-10-21-2161-RE
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Development of a Diagnostic Assay for Differentiation Between Genetic Groups in Clades I, II, III, and IV of

    Szabo, Les J / Olivera, Pablo D / Wanyera, Ruth / Visser, Botma / Jin, Yue

    Plant disease

    2022  Volume 106, Issue 8, Page(s) 2211–2220

    Abstract: Wheat stem rust has reemerged as a serious disease caused by new variants ... ...

    Abstract Wheat stem rust has reemerged as a serious disease caused by new variants of
    MeSH term(s) Basidiomycota/genetics ; Disease Resistance/genetics ; Plant Diseases/genetics ; Puccinia
    Language English
    Publishing date 2022-07-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-10-21-2161-RE
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Historical Development of the

    Labuschagne, Rinette / Venter, Eduard / Boshoff, Willem H P / Pretorius, Zacharias A / Terefe, Tarekegn / Visser, Botma

    Plant disease

    2021  Volume 105, Issue 9, Page(s) 2445–2452

    Abstract: In contrast to many other countries, the virulence and genetic diversity of the South ... ...

    Abstract In contrast to many other countries, the virulence and genetic diversity of the South African
    MeSH term(s) Basidiomycota/genetics ; Plant Diseases ; Puccinia ; South Africa ; Triticum
    Language English
    Publishing date 2021-10-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-10-20-2301-RE
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: The life cycle of

    Boshoff, Willem H P / Wood, Alan R / Visser, Botma / Bender, Cornel M / Joubert, Lize / Richter, Jan / Aime, M Catherine / Pretorius, Zacharias A

    Mycologia

    2022  Volume 114, Issue 2, Page(s) 319–336

    Abstract: Rust fungi are important plant pathogens and have been extensively studied on crops and other host plants worldwide. This study describes the heterecious life cycle of a rust fungus ... ...

    Abstract Rust fungi are important plant pathogens and have been extensively studied on crops and other host plants worldwide. This study describes the heterecious life cycle of a rust fungus on
    MeSH term(s) Animals ; Basidiomycota ; Digitaria ; Life Cycle Stages ; Phylogeny ; Plant Diseases/microbiology ; Plants ; Puccinia ; Solanum ; South Africa
    Language English
    Publishing date 2022-04-01
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ZDB-ID 281335-x
    ISSN 1557-2536 ; 0027-5514
    ISSN (online) 1557-2536
    ISSN 0027-5514
    DOI 10.1080/00275514.2022.2031493
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 1291: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  8. Article: Genome-Enabled Analysis of Population Dynamics and Virulence-Associated Loci in the Oat Crown Rust Fungus

    Hewitt, Tim C / Henningsen, Eva C / Pereira, Danilo / McElroy, Kerensa / Nazareno, Eric S / Dugyala, Sheshanka / Nguyen-Phuc, Hoa / Li, Feng / Miller, Marisa E / Visser, Botma / Pretorius, Zacharias A / Boshoff, Willem H P / Sperschneider, Jana / Stukenbrock, Eva H / Kianian, Shahryar F / Dodds, Peter N / Figueroa, Melania

    Molecular plant-microbe interactions : MPMI

    2024  Volume 37, Issue 3, Page(s) 290–303

    Abstract: ... Puccinia ... ...

    Abstract Puccinia coronata
    MeSH term(s) Disease Resistance/genetics ; Avena/genetics ; Avena/microbiology ; Virulence/genetics ; Genome-Wide Association Study ; Phylogeny ; Plant Diseases/microbiology ; Basidiomycota/genetics ; Population Dynamics ; Puccinia
    Language English
    Publishing date 2024-03-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 743331-1
    ISSN 1943-7706 ; 0894-0282
    ISSN (online) 1943-7706
    ISSN 0894-0282
    DOI 10.1094/MPMI-09-23-0126-FI
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 3530: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  9. Article: Delineating induced defense responses in wheat seedlings exposed to volatiles emitted by Puccinia triticina infected wheat

    Mafa, Mpho S / Castelyn, Howard D / Kemp, Gabre / Visser, Botma

    Physiological and molecular plant pathology. 2020 Dec., v. 112

    2020  

    Abstract: Volatile organic compounds (VOCs) can play an essential role in eliciting an induced defense response in exposed plants. Preceding research showed that Puccinia triticina (Pt) infected resistant wheat emitted VOCs that induced a defense response in ... ...

    Abstract Volatile organic compounds (VOCs) can play an essential role in eliciting an induced defense response in exposed plants. Preceding research showed that Puccinia triticina (Pt) infected resistant wheat emitted VOCs that induced a defense response in uninfected exposed wheat (UR) plants. The current study aimed to determine the biochemical nature of this induced defense response in the UR plants. Seedlings exposed to infected resistant plant VOCs for 8 h were used for proteomic analysis. A total of 26 proteins were up-regulated and 55 proteins were down-regulated. Five up-regulated chaperones proteins (Hsp70, chaperonin 60 subunit beta 3, ClpC, ClpC1 and ClpC2), two elongation factor-Tu, four isoforms of glyceraldehyde-3-phosphate dehydrogenase and xyloglucan galactosyltransferase are generally associated with plant defense responses. The proteomic expression profiles were supported by gene transcript expression patterns showing down-regulated phosphoglycerate kinase, up-regulated ClpC2 chaperone and unchanged carbonic anhydrase encoding transcript levels. In addition, the mitochondrial Cu/Zn superoxide dismutase (Cu/Zn-SOD Mt) encoding gene transcripts and SOD enzymatic activity were significantly induced at 8, 24 and 48 h post volatile exposure (hpe) relative to control (0 hpe). Salicylic acid quantities were significantly induced in the UR plants at 8, 24 and 48 hpe. These findings suggested that induced salicylic acid could be involved in the signaling of biochemical changes in the UR plants upon the reception of the VOCs emitted by the Pt infected wheat plants. The current study thus contributed to improving our understanding of the nature of the biochemical induced defence responses during VOCs exposed uninfected plants in an interplant signaling event.
    Keywords Puccinia recondita ; carbonate dehydratase ; chaperonins ; enzyme activity ; genes ; glyceraldehyde-3-phosphate dehydrogenase ; messenger RNA ; mitochondria ; phosphoglycerate kinase ; plant pathology ; proteomics ; salicylic acid ; superoxide dismutase ; volatile organic compounds ; wheat ; xyloglucans
    Language English
    Dates of publication 2020-12
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 742470-x
    ISSN 0885-5765
    ISSN 0885-5765
    DOI 10.1016/j.pmpp.2020.101538
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  10. Article: Historical Development of the Puccinia triticina Population in South Africa

    Labuschagne, Rinette / Venter, Eduard / Boshoff, Willem H. P. / Pretorius, Zacharias A. / Terefe, Tarekegn / Visser, Botma

    Plant disease. 2021 Sept. 30, v. 105, no. 9

    2021  

    Abstract: In contrast to many other countries, the virulence and genetic diversity of the South African Puccinia triticina population before 1980 is unknown, because of the absence of regular and systematic race analysis data and viable rust cultures. Herbarium ... ...

    Abstract In contrast to many other countries, the virulence and genetic diversity of the South African Puccinia triticina population before 1980 is unknown, because of the absence of regular and systematic race analysis data and viable rust cultures. Herbarium specimens housed at the National Collection of Fungi, Biosystematics Unit, Plant Health and Protection, Agricultural Research Council, Pretoria, South Africa (SA), provided the opportunity to investigate the genetic development of the population using isolates collected between 1906 and 2010. Five subpopulations that survived between 21 and 82 years in the field were found. While three of these could represent the original races that entered SA during European settlement, two appear to be recent exotic introductions into SA, most probably from other African countries. The demise of the three oldest subpopulations might be from the release of resistant wheat cultivars. The population is clonal, where new virulence develops through single step mutations and selection for virulence. Although a possible case of somatic hybridization was found, sexual reproduction appears to be absent in SA. This study confirmed the importance of annual surveys in SA and its neighboring countries for the timely detection of new virulent races that could threaten wheat production in SA.
    Keywords Puccinia recondita ; agricultural research ; cultivars ; genetic variation ; herbaria ; plant health ; somatic hybridization ; taxonomy ; virulence ; wheat ; South Africa
    Language English
    Dates of publication 2021-0930
    Size p. 2445-2452.
    Publishing place The American Phytopathological Society
    Document type Article
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-10-20-2301-RE
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