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Iowa State University

Plant Sciences

Graduate Theses and Dissertations

Sudden Death Syndrome

Publication Year

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Using Genomic And Gene Expression Methods To Understand The Phenotypic Response Of Soybean To Sudden Death Syndrome Caused By Fusarium Virguliforme, Alexander Stephen Luckew Jan 2018

Using Genomic And Gene Expression Methods To Understand The Phenotypic Response Of Soybean To Sudden Death Syndrome Caused By Fusarium Virguliforme, Alexander Stephen Luckew

Graduate Theses and Dissertations

Soybean sudden death syndrome (SDS) is one of the most important soybean diseases in the Midwestern United States, leading to average losses of $396 million per year from 1996 to 2015. The causal agent of SDS, soilborne fungus Fusarium virguliforme (Fv), causes root rot symptoms and releases phytotoxins taken up by the plant to produce chlorosis and necrosis in the leaves. The main management practice used to reduce the impact of SDS is planting resistant soybean cultivars. Resistance to SDS is known to be quantitative with 88 known quantitative trait loci (QTL) based on Soybase.org. Many of these QTL ...


Effect Of Seed Treatments And Soybean Cultivars On Root Rot Caused By Fusarium Virguliforme, Daniel Allan Sjarpe Jan 2017

Effect Of Seed Treatments And Soybean Cultivars On Root Rot Caused By Fusarium Virguliforme, Daniel Allan Sjarpe

Graduate Theses and Dissertations

Fusarium virguliforme, the causal agent of sudden death syndrome (SDS), is one of the most important soybean pathogens in the United States and Canada. Cultivar selection, seed treatments and some cultural practices are currently the main management practices for this disease. Fusarium virguliforme is a soilborne pathogen that infects soybean roots early in development (root rot phase), but also leads to the characteristic foliar symptoms (foliar phase) later in the season. Recently, the product fluopyram (ILeVO®, Bayer CropScience) was registered for management of SDS. The research described in this manuscript explains how fluopyram, in combination with cultivar selection, affects ...


Evaluating Usefulness Of 10 Genomic Regions Associated With Sudden Death Syndrome Resistance In Soybean, Alexander Stephen Luckew Jan 2012

Evaluating Usefulness Of 10 Genomic Regions Associated With Sudden Death Syndrome Resistance In Soybean, Alexander Stephen Luckew

Graduate Theses and Dissertations

Soybean sudden death syndrome (SDS) is one of the most important soybean diseases in the Midwestern United States soybean producing region, leading to losses of $190 million per year from 1996 to 2007. The causal agent of SDS is the soilborne fungus, Fusarium virguliforme. The main management practice used to reduce the impact of SDS is planting resistant soybean cultivars. Resistance to SDS is known to be quantitative with 12 known quantitative trait loci (QTL). To identify the QTL with the largest effects on reducing disease severity recombinant inbred lines (RIL) were crossed among themselves and their progeny screened for ...


Epidemiological Studies On The Infection Process And Symptom Expression Of Soybean Sudden Death Syndrome, Carlos Cecilio Gongora-Canul Jan 2010

Epidemiological Studies On The Infection Process And Symptom Expression Of Soybean Sudden Death Syndrome, Carlos Cecilio Gongora-Canul

Graduate Theses and Dissertations

Sudden death syndrome (SDS) caused by Fusarium virguliforme (Aoki, O'Donnel, Homma & Lattanzi) is one of the most important soybean (Glycine max (L.) Merr.) diseases in the US. Management strategies currently available for this disease are not always effective, partly due to the high variability in symptom expression that occurs in field environments. To clarify the relationship between progress of root rot and foliar symptoms, soybean seedlings were inoculated at five inoculum densities and were destructively sampled over a 50 day period. Disease severity and area under disease progress curve (AUDPC) increased in response to increasing inoculum density (P < 0.01), particularly for foliar symptoms. Root rot severity evaluated 15 to 31 days after inoculation (DAI) was most highly correlated (r ...


Isolation And Characterization Of A Fusarium Virguliforme Toxin That Induces Foliar Sudden Death Syndrome In Soybean [Glycine Max (L.) Merr.], Hargeet Kaur Brar Jan 2010

Isolation And Characterization Of A Fusarium Virguliforme Toxin That Induces Foliar Sudden Death Syndrome In Soybean [Glycine Max (L.) Merr.], Hargeet Kaur Brar

Graduate Theses and Dissertations

Fusarium virguliforme (Fv) is the causal organism of the sudden death syndrome (SDS) in soybean (Glycine max [L.] Merr). The estimated average annual soybean yield loss from this disease is valued at about 300 million dollars. F. virguliforme is a soil borne fungus, which attacks soybean roots and causes root rot as well as chlorosis and necrosis in foliar tissues. The pathogen has never been isolated from the diseased foliar tissues. It was therefore hypothesized that a toxin(s) is involved in the development of the disease.

Cell–free F. virguliforme culture filtrate containing one or more toxins produces foliar ...