Unique infection structures produced by Pseudocercosporella capsellae on oilseed crops Brassica carinata, B. juncea and B. napus in Western Australia
Article
Gunasinghe, N., You, M. P., Clode, P., Cawthray, G. R. and Barbetti, M. J.. 2017. "Unique infection structures produced by Pseudocercosporella capsellae on oilseed crops Brassica carinata, B. juncea and B. napus in Western Australia." Plant Pathology. 66 (2), pp. 304-315. https://doi.org/10.1111/ppa.12563
| Article Title | Unique infection structures produced by Pseudocercosporella capsellae on oilseed crops Brassica carinata, B. juncea and B. napus in Western Australia |
|---|---|
| ERA Journal ID | 2652 |
| Article Category | Article |
| Authors | Gunasinghe, N. (Author), You, M. P. (Author), Clode, P. (Author), Cawthray, G. R. (Author) and Barbetti, M. J. |
| Journal Title | Plant Pathology |
| Journal Citation | 66 (2), pp. 304-315 |
| Number of Pages | 12 |
| Year | 2017 |
| Publisher | John Wiley & Sons |
| Place of Publication | United Kingdom |
| ISSN | 0032-0862 |
| 1365-3059 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1111/ppa.12563 |
| Web Address (URL) | https://bsppjournals.onlinelibrary.wiley.com/doi/epdf/10.1111/ppa.12563 |
| Abstract | White leaf spot disease (Pseudocercosporella capsellae) is widespread across oilseed, vegetable and forage brassicas. Light (LM) and scanning electron (SEM) microscope studies were undertaken to investigate host–pathogen interactions on cotyledons of resistant and susceptible Brassica carinata, B. juncea and B. napus. Under LM, unique brown structures were present, particularly on susceptible genotypes, in two morphologically distinct forms: first, as thread-like structures within cortical tissue by 24 h post-inoculation (hpi) and secondly, as brown ropy strand structures either within cortical tissues (internal ropy strands), or extruded out through stomatal pores (ropy strand extrusions). Under LM, these brown structures were most prevalent in highly susceptible B. juncea ‘Vardan’ that had both a high incidence within cortical tissue (70%) and of ropy strand extrusions (73%), as did susceptible B. napus ‘Trilogy’ within cortical tissue (60%). Under SEM, both these genotypes showed thread-like structures smaller than hyphae forming highly branched networks and ropy strand-like structures. While there were fewer brown structures in susceptible B. carinata UWA #012 (35%), fine, thread-like structures forming networks were again prominent (SEM). In contrast, for resistant genotypes, brown structures (LM) were of very low frequency or absent; only 5% in resistant B. juncea ‘Dune’ and none in resistant B. napus ‘Hyola 42’ or highly resistant B. carinata ATC94129P. Under SEM, fine, threadlike structures were present in the resistant B. juncea ‘Dune’ and B. napus ‘Hyola 42’. Liquid chromatographic analyses of brown structures revealed that both internal ropy strands within cortical tissues and ropy strand extrusions contained the mycotoxin cercosporin. |
| Keywords | cercosporin, extrusion structures, infection structures, resistance mechanisms, white leaf spot |
| ANZSRC Field of Research 2020 | 310705. Mycology |
| 310805. Plant pathology | |
| 300409. Crop and pasture protection (incl. pests, diseases and weeds) | |
| Byline Affiliations | University of Western Australia |
| Institution of Origin | University of Southern Queensland |
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