Dimorphism in Neopseudocercosporella capsellae, an Emerging Pathogen Causing White Leaf Spot Disease of Brassicas
Article
Gunasinghe, Niroshini, Barbetti, Martin J., You, Ming Pei, Dehigaspitiya, Prabuddha and Neate, Stephen. 2021. "Dimorphism in Neopseudocercosporella capsellae, an Emerging Pathogen Causing White Leaf Spot Disease of Brassicas." Frontiers in Cellular and Infection Microbiology. 11, pp. 1-15. https://doi.org/10.3389/fcimb.2021.678231
| Article Title | Dimorphism in Neopseudocercosporella capsellae, an Emerging Pathogen Causing White Leaf Spot Disease of Brassicas |
|---|---|
| ERA Journal ID | 200513 |
| Article Category | Article |
| Authors | Gunasinghe, Niroshini (Author), Barbetti, Martin J. (Author), You, Ming Pei (Author), Dehigaspitiya, Prabuddha (Author) and Neate, Stephen (Author) |
| Journal Title | Frontiers in Cellular and Infection Microbiology |
| Journal Citation | 11, pp. 1-15 |
| Article Number | 678231 |
| Number of Pages | 15 |
| Year | 2021 |
| Place of Publication | Switzerland |
| ISSN | 2235-2988 |
| Digital Object Identifier (DOI) | https://doi.org/10.3389/fcimb.2021.678231 |
| Web Address (URL) | https://www.frontiersin.org/articles/10.3389/fcimb.2021.678231/full |
| Abstract | White leaf spot pathogen: Neopseudocercosporella capsellae causes significant damage to many economically important Brassicaceae crops, including oilseed rape through foliar, stem, and pod lesions under cool and wet conditions. A lack of information on critical aspects of the pathogen's life cycle limits the development of effective control measures. The presence of single-celled spores along with multi-celled conidia on cotyledons inoculated with multi-celled conidia suggested that the multi-celled conidia were able to form single-celled spores on the host surface. This study was designed to demonstrate N. capsellae morphological plasticity, which allows the shift between a yeast-like single-celled phase and the multi-celled hyphal phase. Separate experiments were designed to illustrate the pathogen's morphological transformation to single-celled yeast phase from multi-celled hyphae or multi-celled macroconidia in-vitro and in-planta. Results confirmed the ability of N. capsellae to switch between two morphologies (septate hyphae and single-celled yeast phase) on a range of artificial culture media (in-vitro) or in-planta on the host surface before infection occurs. The hyphae-to-yeast transformation occurred through the production of two morphologically distinguishable blastospore (blastoconidia) types (meso-blastospores and micro-blastospores), and arthrospores (arthroconidia). |
| Keywords | Arthroconidia; Blastoconidia; Brassica; dimorphism; morphological transformation; N. capsellae; white leaf spot |
| ANZSRC Field of Research 2020 | 310805. Plant pathology |
| Byline Affiliations | Centre for Crop Health |
| University of Western Australia | |
| University of Adelaide | |
| Institution of Origin | University of Southern Queensland |
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