Colonization of durum wheat (Triticum turgidum L. var. durum) culms exhibiting premature senescence (dead heads) associated with Fusarium pseudograminearum crown rot
Article
Article Title | Colonization of durum wheat (Triticum turgidum L. var. durum) culms exhibiting premature senescence (dead heads) associated with Fusarium pseudograminearum crown rot |
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ERA Journal ID | 2647 |
Article Category | Article |
Authors | Knight, Noel L. (Author), Macdonald, Bethany (Author) and Sutherland, Mark W. (Author) |
Journal Title | Plant Disease: an international journal of applied plant pathology |
Journal Citation | 101 (10), pp. 1788-1794 |
Number of Pages | 9 |
Year | 2017 |
Publisher | American Phytopathological Society |
Place of Publication | St. Paul, MN, United States |
ISSN | 0191-2917 |
1943-7692 | |
Digital Object Identifier (DOI) | https://doi.org/10.1094/PDIS-03-17-0415-RE |
Web Address (URL) | https://apsjournals.apsnet.org/doi/10.1094/PDIS-03-17-0415-RE |
Abstract | Fusarium crown rot is a significant disease of durum wheat (Triticum turgidum L. var. durum), which exhibits high levels of disease susceptibility. The most extreme symptom of crown rot is a prematurely senescing culm which typically fails to set grain. Individual crown rot-affected durum wheat plants displaying both non-senescent and prematurely senescent culms were harvested to compare visual discoloration, Fusarium pseudograminearum biomass and vascular colonization in culm sections sampled at three different heights above the crown. Field samples of EGA Bellaroi were collected at Wellcamp, Queensland, in 2011, 2012, 2013 and 2014, and of Hyperno at Narrabri, New South Wales, in 2014. Prematurely senescent culms exhibited greater visual discoloration, Fusarium pseudograminearum biomass and vascular colonization than non-senescent culms in each year they were examined. The extent of these differences varied between environments and timing of collection in each year. Vascular colonization initially occurred in xylem vessels and spread into phloem tissues as disease severity increased. The increased presence of hyphae in vascular bundles of prematurely senescing culms provides strong evidence for the hypothesis that restriction of water and nutrient movement in a diseased culm is a key factor in crown rot severity. |
Keywords | graminearum group-1; quantitative PCR; discolouration; infection; seedlings |
ANZSRC Field of Research 2020 | 310805. Plant pathology |
300409. Crop and pasture protection (incl. pests, diseases and weeds) | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Centre for Crop Health |
Department of Agriculture and Fisheries, Queensland | |
Institution of Origin | University of Southern Queensland |
Funding source | Grant ID SRF: Enhancing biotic and abiotic stress tolerance in winter cereals |
https://research.usq.edu.au/item/q4637/colonization-of-durum-wheat-triticum-turgidum-l-var-durum-culms-exhibiting-premature-senescence-dead-heads-associated-with-fusarium-pseudograminearum-crown-rot
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