Colonization of durum wheat (Triticum turgidum L. var. durum) culms exhibiting premature senescence (dead heads) associated with Fusarium pseudograminearum crown rot

Knight, Noel L. and Macdonald, Bethany and Sutherland, Mark W. (2017) Colonization of durum wheat (Triticum turgidum L. var. durum) culms exhibiting premature senescence (dead heads) associated with Fusarium pseudograminearum crown rot. Plant Disease, 101 (10). pp. 1788-1794. ISSN 0191-2917

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to paper, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 21 Aug 2017 00:23
Last Modified: 21 May 2018 00:07
Uncontrolled Keywords: graminearum group-1; quantitative PCR; discolouration; infection; seedlings
Fields of Research : 06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970106 Expanding Knowledge in the Biological Sciences
E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences
Funding Details:
Identification Number or DOI: 10.1094/PDIS-03-17-0415-RE
URI: http://eprints.usq.edu.au/id/eprint/32988

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