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Iowa State University

Plant Sciences

Graduate Theses and Dissertations

Fusarium virguliforme

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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 ...


Investigation Of Germination, Growth, Sporulation, And Host-Induced Rna Interference In Fusarium Virguliforme, Jill Marshall Jan 2016

Investigation Of Germination, Growth, Sporulation, And Host-Induced Rna Interference In Fusarium Virguliforme, Jill Marshall

Graduate Theses and Dissertations

xSudden death syndrome (SDS) is one of the leading soybean diseases in the United States. The disease is caused by a soil-borne fungi Fusarium virguliforme in North America and by four Fusarium species, F. virguliforme, F. tucumaniae F. brasiliense and F. crassitipitatum, in South America. F. virguliforme infects the roots of soybean plants and releases toxins which causes the interveinal chlorosis and necrosis on leaves, premature defoliation, and flower and pod abortion that are typical foliar SDS symptoms. Yield losses associated with SDS can be economically devastating depending on disease intensity and timing of disease onset. Host-induced gene silencing (HIGS ...


Influence Of Heterodera Glycines Infection, Plant Age And Water Availability On Foliar Symptoms Of Sudden Death Syndrome, Root Symptom Severity And Root Morphology Of Soybean Plants Infected By Fusarium Virguliforme, Nenad Tatalović Jan 2014

Influence Of Heterodera Glycines Infection, Plant Age And Water Availability On Foliar Symptoms Of Sudden Death Syndrome, Root Symptom Severity And Root Morphology Of Soybean Plants Infected By Fusarium Virguliforme, Nenad Tatalović

Graduate Theses and Dissertations

Fusarium virguliforme Aoki, O'Donnell, Homma and Lattanzi (FV), a causal organism of sudden death syndrome (SDS), and Heterodera glycines Ichinohe, the soybean cyst nematode (SCN), are two of the most important soil-borne pathogens affecting soybean production in the USA. These pathogens often occur together in production fields and interact, which results in significant yield losses. In co-infected plants, SDS symptoms appear earlier and are more severe than in plants infected by FV alone. However, the mechanism of the SCN-FV interaction remains unclear. Fusarium virguliforme is able to infect soybean plants of different growth stages, but plants infected at younger ...


Investigation Of The Arabidopsis Nonhost Resistance Mechanism Against The Soybean Pathogen, Phytophthora Sojae, Rishi Sumit Jan 2013

Investigation Of The Arabidopsis Nonhost Resistance Mechanism Against The Soybean Pathogen, Phytophthora Sojae, Rishi Sumit

Graduate Theses and Dissertations

Nonhost resistance (NHR) provides immunity to all members of a plant species against all isolates of a microorganism that is pathogenic to other plant species. Three Arabidopsis thaliana PEN (penetration deficient) genes, PEN1, 2 and 3 have been shown to provide prehaustorial NHR against the barley pathogen Blumeria graminis f. sp. hordei. Arabidopsis pen1-1 mutant is penetrated by the hemibiotrophic oomycete pathogen, Phytophthora sojae that causes root and stem rot disease in soybean. The P. sojae susceptible (pss) 1 mutant is infected by both P. sojae and the hemibiotrophic fungal pathogen, Fusarium virguliforme that causes sudden death syndrome in soybean ...


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 ...