Browsing by UP Author "Steenkamp, Emma Theodora"

Browsing by UP Author "Steenkamp, Emma Theodora"

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  • Agrobacterium-mediated transformation of Ceratocystis albifundus 
    Sayari, Mohammad; Van der Nest, Magrieta Aletta; Steenkamp, Emma Theodora; Adegeye, O.O.; Marincowitz, Seonju; Wingfield, Brenda D. (Elsevier, 2019-09)
    Functional association between genomic loci and specific biological traits remains lacking in many fungi, including the African tree pathogen Ceratocystis albifundus. This is mainly because of the absence of suitable ...
  • All ANIs are not created equal : implications for prokaryotic species boundaries and integration of ANIs into polyphasic taxonomy 
    Palmer, Marike; Steenkamp, Emma Theodora; Blom, Jochen; Hedlund, Brian P.; Venter, S.N. (Stephanus Nicolaas) (Microbiology Society, 2020-04)
    In prokaryotic taxonomy, a set of criteria is commonly used to delineate species. These criteria are generally based on cohesion at the phylogenetic, phenotypic and genomic levels. One such criterion shown to have promise ...
  • Architecture and distribution of introns in core genes of four Fusarium species 
    Phasha, Mmatshepho Malekgale; Wingfield, Brenda D.; Coetzee, Martin Petrus Albertus; Santana, Quentin C.; Fourie, Gerda; Steenkamp, Emma Theodora (Genetics Society of America, 2017-11)
    Removal of introns from transcribed RNA represents a crucial step during the production of mRNA in eukaryotes. Available whole-genome sequences and expressed sequence tags (ESTs) have increased our knowledge of this ...
  • Both alpha- and beta-rhizobia occupy the root nodules of Vachellia karroo in South Africa 
    Beukes, Chrizelle Winsie; Boshoff, Francois S.; Phalane, Francina L.; Hassen, Ahmed Idris; Le Roux, Marianne M.; Stepkowski, Tomasz; Venter, S.N. (Stephanus Nicolaas); Steenkamp, Emma Theodora (Frontiers Media, 2019-06-04)
    Vachellia karroo (formerly Acacia karroo) is a wide-spread legume species indigenous to southern Africa. Little is known regarding the identity or diversity of rhizobia that associate with this plant in its native range ...
  • Both mating types in the heterothallic fungus Ophiostoma quercus contain MAT1-1 and MAT1-2 genes 
    Wilken, Pieter Markus; Steenkamp, Emma Theodora; Hall, Tracy A.; De Beer, Z. Wilhelm; Wingfield, Michael J.; Wingfield, Brenda D. (Elsevier, 2012)
    In heterothallic Ascomycota, two opposite but distinct mating types control all sexual processes. Using mating crosses, mating types were assigned to ten isolates of the heterothallic fungal species Ophiostoma quercus. ...
  • Bradyrhizobium altum sp. nov., Bradyrhizobium oropedii sp. nov. and Bradyrhizobium acaciae sp. nov. from South Africa show locally restricted and pantropical nodA phylogeographic patterns 
    Avontuur, Juanita Rayleen; Palmer, Marike; Beukes, Chrizelle Winsie; Chan, Wai Yin; Tasiya, Taponeswa; Van Zyl, Elritha; Coetzee, Martin Petrus Albertus; Stepkowski, Tomasz; Venter, S.N. (Stephanus Nicolaas); Steenkamp, Emma Theodora (Elsevier, 2022-02)
    Please read abstract in the article.
  • Bradyrhizobium xenonodulans sp. nov. isolated from nodules of Australian Acacia species invasive to South Africa 
    Claassens, Ricu; Venter, S.N. (Stephanus Nicolaas); Beukes, Chrizelle W.; Stepkowski, Tomasz; Chan, Wai Yin; Steenkamp, Emma Theodora (Elsevier, 2023-09)
    Please read abstract in the article.
  • Burkholderia kirstenboschensis sp. nov. nodulates papilionoid legumes indigenous to South Africa 
    Steenkamp, Emma Theodora; Van Zyl, E.; Beukes, Chrizelle Winsie; Avontuur, Juanita Rayleen; Chan, Wai Yin; Palmer, Marike; Mthombeni, Lunghile S.; Phalane, Francina Lebogang; Sereme, T. Karabo; Venter, S.N. (Stephanus Nicolaas) (Elsevier, 2015-12)
    Despite the diversity of Burkholderia species known to nodulate legumes in introduced and native regions, relatively few taxa have been formally described. For example, the Cape Floristic Region of South Africa is thought ...
  • Causes and consequences of variability in peptide mating pheromones of ascomycete fungi 
    Martin, Simon H.; Wingfield, Brenda D.; Wingfield, Michael J.; Steenkamp, Emma Theodora (Oxford University Press, 2011)
    The reproductive genes of fungi, like those of many other organisms, are thought to diversify rapidly. This phenomenon could be associated with the formation of reproductive barriers and speciation. Ascomycetes produce ...
  • Characterization of host-specific genes from pine- and grass-associated species of the Fusarium fujikuroi species complex 
    Dewing, Claudette; Van der Nest, Magrieta Aletta; Santana, Quentin C.; Proctor, Robert H.; Wingfield, Brenda D.; Steenkamp, Emma Theodora; De Vos, Lieschen (MDPI, 2022-07-29)
    The Fusarium fujikuroi species complex (FFSC) includes socioeconomically important pathogens that cause disease for numerous crops and synthesize a variety of secondary metabolites that can contaminate feedstocks and ...
  • Characterization of the ergosterol biosynthesis pathway in Ceratocystidaceae 
    Sayari, Mohammad; Van der Nest, Magrieta Aletta; Steenkamp, Emma Theodora; Rahimlou, Saleh; Hammerbacher, Almuth; Wingfield, Brenda D. (MDPI, 2021-03-22)
    Terpenes represent the biggest group of natural compounds on earth. This large class of organic hydrocarbons is distributed among all cellular organisms, including fungi. The different classes of terpenes produced by ...
  • Characterization of the Fusarium circinatum biofilm environmental response role 
    Ratsoma, Manchela Francinah; Mokoena, Nthabiseng Z.; Santana, Quentin C.; Wingfield, Brenda D.; Steenkamp, Emma Theodora; Motaung, Thabiso Eric (Wiley, 2024-04)
    The capacity to form biofilms is a common trait among many microorganisms present on Earth. In this study, we demonstrate for the first time that the fatal pine pitch canker agent, Fusarium circinatum, can lead a biofilm-like ...
  • Chitosan application improves resistance to Fusarium circinatum in Pinus patula 
    Fitza, Katrin N.E.; Payn, K.; Steenkamp, Emma Theodora; Myburg, Alexander Andrew; Naidoo, Sanushka (Elsevier, 2013-03)
    Fusarium circinatum is the causal agent for the disease, pitch canker, in Pinus patula. Commercial forestry incurs large economic losses from the pathogen, primarily as a result of post-planting mortality resulting in ...
  • Chromosome-level assemblies for the pine pitch canker pathogen Fusarium circinatum 
    De Vos, Lieschen; Van der Nest, Magrieta Aletta; Santana, Quentin C.; Van Wyk, Stephanie; Leeuwendaal, Kyle; Wingfield, Brenda D.; Steenkamp, Emma Theodora (MDPI, 2024-01)
    The pine pitch canker pathogen, Fusarium circinatum, is globally regarded as one of the most important threats to commercial pine-based forestry. Although genome sequences of this fungus are available, these remain highly ...
  • Clonality and limited population diversity of Fusarium circinatum in Colombia 
    Ceriani, Callin; Wingfield, Michael J.; Fru, Felix Fon; Van Wyk, S.; Rodas, Carlos A.; Wingfield, Brenda D.; Steenkamp, Emma Theodora (Wiley, 2024-06)
    Fusarium circinatum is an important fungal pathogen of Pinus species utilized in commercial forestry worldwide. In Colombia, it was first found on nursery plants and later in plantations associated with basal cankers on ...
  • Combined de novo and genome guided assembly and annotation of the Pinus patula juvenile shoot transcriptome 
    Visser, Erik A.; Wegrzyn, Jill L.; Steenkamp, Emma Theodora; Myburg, Alexander Andrew; Naidoo, Sanushka (BioMed Central, 2015-12-12)
    BACKGROUND : Pines are the most important tree species to the international forestry industry, covering 42 % of the global industrial forest plantation area. One of the most pressing threats to cultivation of some pine ...
  • Comparison of the tolerance of Pinus patula seedlings and established trees to infection by Fusarium circinatum 
    Mitchell, R.G. (Richard Glen); Wingfield, Michael J.; Steenkamp, Emma Theodora; Roux, Jolanda; Verryn, Steve D.; Coutinho, Teresa A. (Taylor and Francis, 2014)
    Since the first appearance of Fusarium circinatum in South Africa in 1990, foresters have been challenged with poor field survival of seedlings at establishment. One of the best long-term solutions is to improve the genetic ...
  • Complete mitochondrial genome sequence of the white root rot pathogen Dematophora necatrix (Xylariaceae: Xylariales) 
    Van der Nest, Magrieta Aletta; Steenkamp, Emma Theodora; De Vos, Lieschen; Wienk, Raven; Swart, Velushka; Van den Berg, Noelani (Taylor and Francis Group, 2024)
    The mitochondrial genome of Dematophora necatrix is 121,350 base pairs in length with a GþC content of 30.19%. Phylogenetic analysis showed that D. necatrix grouped with other members of the Xylariaceae, with which its ...
  • Complex evolutionary history of photosynthesis in Bradyrhizobium 
    Avontuur, Juanita Rayleen; Wilken, Pieter Markus; Palmer, Marike; Coetzee, Martin Petrus Albertus; Stępkowski, Tomasz; Venter, S.N. (Stephanus Nicolaas); Steenkamp, Emma Theodora (Microbiology Society, 2023-09-07)
    Bradyrhizobium comprises a diverse group of bacteria with various lifestyles. Although best known for their nodule-based nitrogen-fixation in symbiosis with legumes, a select group of bradyrhizobia are also capable of ...
  • Concerted evolution in the ribosomal RNA cistron 
    Naidoo, Kershney; Steenkamp, Emma Theodora; Coetzee, Martin Petrus Albertus; Wingfield, Michael J.; Wingfield, Brenda D.; Corradi, Nicolas (Public Library of Science, 2013-03-12)
    BACKGROUND: Gene conversion is the mechanism proposed to be responsible for the homogenization of multigene families such as the nuclear ribosomal gene clusters. This concerted evolutionary process prevents individual ...