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

Knight, Noel Liam 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 . ISSN 0191-2917

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Article Link(s): https://doi.org/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.

Item Type:Article
Business groups:Crop and Food Science
Subjects:Plant culture > Field crops > Wheat
Plant pests and diseases
Plant pests and diseases > Plant pathology
Deposited On:03 Aug 2017 03:42
Last Modified:03 Aug 2017 03:42

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