Mechanisms of resistance in Brassica carinata, B. napus and B. juncea to Pseudocercosporella capsellae
Article
Gunasinghe, N., You, M. P., Clode, P. L. and Barbetti, M. J.. 2016. "Mechanisms of resistance in Brassica carinata, B. napus and
B. juncea to Pseudocercosporella capsellae." Plant Pathology. 65 (6), pp. 888-900. https://doi.org/10.1111/ppa.12484
| Article Title | Mechanisms of resistance in Brassica carinata, B. napus and |
|---|---|
| ERA Journal ID | 2652 |
| Article Category | Article |
| Authors | Gunasinghe, N. (Author), You, M. P. (Author), Clode, P. L. (Author) and Barbetti, M. J. (Author) |
| Journal Title | Plant Pathology |
| Journal Citation | 65 (6), pp. 888-900 |
| Number of Pages | 13 |
| Year | 2016 |
| Publisher | John Wiley & Sons |
| Place of Publication | United Kingdom |
| ISSN | 0032-0862 |
| 1365-3059 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1111/ppa.12484 |
| Web Address (URL) | https://bsppjournals.onlinelibrary.wiley.com/doi/full/10.1111/ppa.12484 |
| Abstract | Studies were undertaken to compare susceptible and resistant host responses to Pseudocercosporella capsellae in cotyledons of Brassica carinata, B. juncea and B. napus in order to define the mechanisms of resistance in these three species. On both resistant and susceptible hosts, hyphal penetration was always through stomatal openings and without infection pegs or appressoria. On resistant B. carinata ATC94129P, up to 72% of spores disintegrated and, generally, germination (<22%) and germ tube lengths (<25 μm) were comparatively low. Resistant B. napus Hyola 42 had the lowest germination (8%) and susceptible B. carinata UWA#012 had the highest (51%). On resistant B. carinata ATC94129P, germ tube extension was impeded across 24–60 h post‐inoculation (hpi) and percentage stomatal penetration lower (4%) at 60 hpi compared with susceptible B. carinata UWA#012 (26%). Stomatal densities (stomata/14 757 μm2) on resistant B. juncea Dune (2·12) and B. napus Hyola 42 (1·62) were lower than for susceptible B. juncea Vardan (2·40) and B. napus Trilogy (2·03). Resistant B. carinata ATC94129P had greater stomatal density (1·89) than susceptible B. carinata UWA#012 (1·58). Overall, B. juncea had greater stomatal density (2·26) compared with B. napus (1·83) and B. carinata (1·74). In resistant B. carinata ATC94129P, P. capsellae induced 28% stomata to close, while in susceptible B. carinata UWA#012 no such closure was induced. Epicuticular wax crystalloids were present only on resistant B. carinata ATC94129P and probably also contribute towards resistance. |
| Keywords | Brassica carinata, Brassica juncea, Brassica napus, Pseudocercosporella capsellae, 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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