Phenotypic and Genotypic Variation of Puccinia helianthi in South Africa

Article


Meyer, Wilku B., Boshoff, Willem H. P., Minnaar-Onton, Adré, Young, Anthony, Kong, Gary, Thompson, S., Pretorius, Zacharias A. and Visser, B.. 2021. "Phenotypic and Genotypic Variation of Puccinia helianthi in South Africa ." Plant Disease: an international journal of applied plant pathology. 105 (5), pp. 1482-1489. https://doi.org/10.1094/PDIS-09-20-1903-RE
Article Title

Phenotypic and Genotypic Variation of Puccinia helianthi in South Africa

ERA Journal ID2647
Article CategoryArticle
AuthorsMeyer, Wilku B., Boshoff, Willem H. P., Minnaar-Onton, Adré, Young, Anthony, Kong, Gary, Thompson, S., Pretorius, Zacharias A. and Visser, B.
Journal TitlePlant Disease: an international journal of applied plant pathology
Journal Citation105 (5), pp. 1482-1489
Number of Pages8
YearMay 2021
Place of PublicationUnited States
ISSN0191-2917
1943-7692
Digital Object Identifier (DOI)https://doi.org/10.1094/PDIS-09-20-1903-RE
Web Address (URL)https://apsjournals.apsnet.org/doi/10.1094/PDIS-09-20-1903-RE
Abstract

Sunflower (Helianthus annuus L.) is the third largest grain crop by area planted in South Africa (SA). The annual yield is negatively affected by sunflower rust caused by Puccinia helianthi Schw. (Phe). Four Phe races were described in SA in the middle 1990s, but since then, no new race descriptions have been conducted. This has resulted in an information gap on the current Phe population, making it difficult to explain increased disease incidence and loss of resistance in previously resistant hybrids. To address this, 114 Phe field isolates along with 23 historic isolates were phenotyped using the international set of 11 sunflower differentials containing the R1, R2/R10, R3, R4a, R4b, R4c, R4d, R5, Pu6, and Radv resistance genes. Three new Phe races were identified, bringing the total number of South African races recorded to seven. No avirulence was detected attributable to the R1 gene, with the R4d and Radv genes remaining effective. Four main genetic lineages were detected with no obvious correlation between phenotype and genotype. The detection of three genetic lineages consisting exclusively of field isolates collected post-2006 suggested the possible recent entry of exotic introductions into SA. This, combined with the fact that one lineage consisted exclusively of the most virulent race Phe7721, confirmed a clear shift in the Phe population that could explain the increased virulence and occurrence of the disease in SA.

Keywordsgenotypic variation; Helianthus annuus; pathogenic variation; Puccinia helianthi; South Africa; sunflower rust
ANZSRC Field of Research 2020300409. Crop and pasture protection (incl. pests, diseases and weeds)
Public Notes

Files associated with this item cannot be displayed due to copyright restrictions.

Byline AffiliationsUniversity of the Free State, South Africa
University of Queensland
Redclaw Ink, Australia
University of Southern Queensland
Permalink -

https://research.usq.edu.au/item/v88y6/phenotypic-and-genotypic-variation-of-puccinia-helianthi-in-south-africa

  • 31
    total views
  • 0
    total downloads
  • 0
    views this month
  • 0
    downloads this month

Export as

Related outputs

Synchronous computer-mediated communication and task-based learning in the EFL classroom
Young, Anthony and Son, Jeong-Bae. 2023. "Synchronous computer-mediated communication and task-based learning in the EFL classroom." Language Teaching Research. https://doi.org/10.1177/13621688231191309
An Investigation of Synchronous Online Communication and Task-Based Learning in the EFL Classroom
Young, Anthony. 2022. An Investigation of Synchronous Online Communication and Task-Based Learning in the EFL Classroom. Doctorate other than PhD Doctor of Education. University of Southern Queensland. https://doi.org/10.26192/q7q64
Optimal environmental conditions for the infection and development of Puccinia purpurea on sorghum
White, J. A., Ryley, M. J., George, D. L. and Kong, G. A.. 2014. "Optimal environmental conditions for the infection and development of Puccinia purpurea on sorghum." Australasian Plant Pathology. 43 (4), pp. 447-457. https://doi.org/10.1007/s13313-014-0292-9
Yield losses in grain sorghum due to rust infection
White, Jodie A., Ryley, Malcolm J., George, Doug L., Kong, Gary A. and White, Simon C.. 2012. "Yield losses in grain sorghum due to rust infection ." Australasian Plant Pathology. 41 (1), pp. 85-91. https://doi.org/10.1007/s13313-011-0093-3