Dimorphism in Neopseudocercosporella capsellae, an Emerging Pathogen Causing White Leaf Spot Disease of Brassicas
Article
Article Title | Dimorphism in Neopseudocercosporella capsellae, an Emerging Pathogen Causing White Leaf Spot Disease of Brassicas |
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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 |
https://research.usq.edu.au/item/q6y31/dimorphism-in-neopseudocercosporella-capsellae-an-emerging-pathogen-causing-white-leaf-spot-disease-of-brassicas
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