Phenotypic and genotypic description of Puccinia graminis f. sp. tritici race 2SA55 in South Africa

Boshoff, W. H. P.; Pretorius, Z. A.; Terefe, T.; Bender, C. M.; Herselman, L.; Maree, G. J.; Visser, B.

doi:10.1007/s10658-018-1527-3

Cited by 7 publications

(8 citation statements)

References 10 publications

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“…The acquisition of virulence within this group appears to be the result of step-wise mutations. 32,33 On a global scale, this lineage grouped closest with Pgt samples from Pakistan, Czech Republic 47,48 and Australia due to the proposed movement of urediniospores on high-altitude westerly winds 46 .…”

Section: Genetic Analysis Of Puccinia Isolatesmentioning

confidence: 91%

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Accomplishments in wheat rust research in South Africa

Pretorius

Prins

Wessels³

et al. 2020

S. Afr. J. Sci.

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Rust diseases, although seasonal, have been severe constraints in wheat production in South Africa for almost 300 years. Rust research gained momentum with the institution of annual surveys in the 1980s, followed by race identification, an understanding of rust epidemiology, and eventually a focused collaboration amongst pathologists, breeders and geneticists. Diversity in South African populations of Puccinia triticina, P. graminis f. sp. tritici and P. striiformis f. sp. tritici has been described and isolates are available to accurately phenotype wheat germplasm and study pathogen populations at national, regional and global levels. Sources of resistance have been, and still are, methodically analysed and molecular marker systems were developed to incorporate, stack and verify complex resistance gene combinations in breeding lines and cultivars. Vigilance, capacity, new technologies, collaboration and sustained funding are critical for maintaining and improving the current research impetus for future management of these important diseases.

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Section: Genetic Analysis Of Puccinia Isolatesmentioning

confidence: 91%

“…32 New races are further characterised on an extended set of tester lines. 33 Although differential lines grown in the field can provide an indication of prevailing Pgt races, Boshoff et al 34 showed that certain resistance genes are not well expressed in adult plants whereas other lines contain resistance in addition to that observed in seedling assays.…”

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confidence: 99%

Accomplishments in wheat rust research in South Africa

Pretorius

Prins

Wessels³

et al. 2020

S. Afr. J. Sci.

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“…b Avirulence/virulence according to Terefe et al (2016) and Boshoff et al (2018). c Selective hosts on which urediniospores of pathotypes were increased.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Triticale cultivars remain resistant to Pgt pathotypes in the Ug99 lineage (Boshoff et al 2018). Besides the value of Sr27, SrKw and SrSatu in pathotyping Pgt isolates in SA (Olivera et al 2013;Boshoff et al 2018Boshoff et al , 2019, little is known about the infection process of this crop species by Pgt pathotypes respectively dominating on triticale and wheat. In this study we compared stem rust infection, colonization, and the expression of resistance in adult plants of susceptible and resistant triticale cultivars with that of a susceptible wheat variety using selected Pgt pathotypes.…”

Section: Introductionmentioning

confidence: 99%

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Infection and colonization of triticale by Puccinia graminis f. sp. tritici

Bender

Boshoff

Pretorius

2021

Canadian Journal of Plant Pathology

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Histological investigations elucidate infection structure development and the subsequent colonization process of rust pathogens in their cereal hosts. No comprehensive information exists for the infection process of the wheat stem rust fungus, Puccinia graminis f. sp. tritici (Pgt), on triticale, an amphiploid species carrying both the wheat and rye genomes. The adult plant stem rust response of the triticale cultivars 'Kiewiet', 'Coorong' and 'Satu' and the bread wheat control, Line 37-07, was determined under controlled conditions using Pgt pathotypes UVPgt56, UVPgt60 and UVPgt62. Flag leaf sheaths were sampled 24 and 48 h post-inoculation (hpi) for scanning electron microscopy (SEM), 120 hpi for fluorescence microscopy, and 16 days post-inoculation for a fungal biomass assay. Although slight differences were observed between the epidermal morphology of triticale and wheat stem sheaths, SEM results indicated that this did not influence early infection by Pgt. Fluorescence microscopy revealed that colony size was affected by both host genotype and pathotype. Colony size strongly corresponded with fungal biomass accumulation, except in 'Kiewiet', where fungal growth was not restricted to the same degree as in other incompatible interactions. This study shows that methods commonly used for studying histopathology of Pgt in wheat are equally applicable to triticale.

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