Disease responses of hexaploid spring wheat (Triticum aestivum) culms exhibiting premature senescence (dead heads) associated with Fusarium pseudograminearum crown rot

Knight, Noel L. and Macdonald, Bethany and Percy, Cassy ORCID: https://orcid.org/0000-0002-7807-6764 and Sutherland, Mark W. (2020) Disease responses of hexaploid spring wheat (Triticum aestivum) culms exhibiting premature senescence (dead heads) associated with Fusarium pseudograminearum crown rot. European Journal of Plant Pathology, 159 (1). pp. 191-202. ISSN 0929-1873


Abstract

Hexaploid spring wheat (Triticum aestivum) may exhibit significant crown rot disease responses to infection by Fusarium pseudograminearum, with a range of susceptibility levels available in commercial cultivars. Dry conditions during grain-fill may lead to the expression of prematurely senescing culms, which typically fail to set grain. Assessment of hexaploid spring wheat plants exhibiting both non-senescent and prematurely senescent culms was performed using visual discolouration, F. pseudograminearum biomass and vascular colonisation in culm sections sampled at three different heights above the crown and at the peduncle. Samples from six commercial cultivars were collected at milk development in 2014 from Narrabri and Tamworth, New South Wales and Wellcamp, Queensland. Prematurely senescent culms exhibited greater visual discolouration, F. pseudograminearum biomass and vascular colonisation than non-senescent culms in each cultivar. A further comparison of the parameters across four time points from milk development, when senescent culms are first observed, to maturity was conducted for cultivar Sunlin. F. pseudograminearum biomass and vascular colonisation were significantly different between culm conditions prior to maturation, while visual discolouration was not significantly different between culm conditions at any single time point. Colonisation of xylem and phloem tissue was extensive in the basal portions of prematurely senescent culms (36 to 99%) prior to maturation, and suggests significant impacts on water and nutrient movement during crown rot disease. Despite a range of resistance ratings being assessed, cultivars were not reliably separated based upon responses to severe disease pressure, demonstrating the continuing need for improved crown rot resistance in commercial wheat.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health (24 Mar 2014 -)
Date Deposited: 18 Mar 2021 05:48
Last Modified: 31 Mar 2021 05:35
Uncontrolled Keywords: Field experiment, Fusarium, Microscopy, Quantitative PCR, Time-course
Fields of Research (2008): 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)
Fields of Research (2020): 31 BIOLOGICAL SCIENCES > 3108 Plant biology > 310805 Plant pathology
30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3004 Crop and pasture production > 300409 Crop and pasture protection (incl. pests, diseases and weeds)
Socio-Economic Objectives (2008): 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
B Economic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820507 Wheat
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280102 Expanding knowledge in the biological sciences
26 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 2603 Grains and seeds > 260312 Wheat
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280101 Expanding knowledge in the agricultural, food and veterinary sciences
Identification Number or DOI: https://doi.org/10.1007/s10658-020-02158-8
URI: http://eprints.usq.edu.au/id/eprint/41578

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