Common Hosts for Fusarium oxysporum formae speciales spinaciae and betae

Armstrong, G. M.

doi:10.1094/phyto-66-542

Cited by 17 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This underlines the challenges spinach seed growers in the PNW face at identifying fields suitable for spin ach seed crops. Persistence of the spinach Fusarium wilt pathogen in soils in this region may reflect the ability of the fungus to colonize roots or debris of one or more crops grown in rotation with spinach (e.g., 3,4,19).…”

Section: Discussionmentioning

confidence: 99%

A Soil Bioassay for Predicting the Risk of Spinach Fusarium wilt

Gatch

Toit

2015

Plant Disease

View full text Add to dashboard Cite

The maritime Pacific Northwest is the only region of the United States suitable for production of spinach seed, a cool-season, daylength-sensitive crop. However, the acidic soils of this region are highly conducive to spinach Fusarium wilt, caused by Fusarium oxysporum f. sp. spinaciae. Rotations of at least 10 to 15 years between spinach seed crops are necessary to reduce the high risk of losses to this disease. The objectives of this study were to develop a greenhouse soil bioassay to assess the relative risk of Fusarium wilt in fields intended for spinach seed production, and to identify soil chemical and physical properties associated with conduciveness to this disease. Preliminary bioassays established a protocol for growing spinach plants in a greenhouse environment and inducing Fusarium wilt symptoms so that the bioassay can be completed in <2 months. Test soils with a range of Fusarium wilt inoculum potentials, and three spinach inbred parent lines (highly susceptible, moderately susceptible, and moderately resistant to Fusarium wilt) were used to evaluate sensitivity of the bioassay to different levels of risk of Fusarium wilt. Then, from 2010 to 2013, spinach seed growers and stakeholders submitted soil samples from 147 fields for evaluation with the bioassay. The fields were each under consideration for planting a spinach seed crop, yet the bioassay revealed a wide range in Fusarium wilt inoculum potential among soil samples. Differences in susceptibility to Fusarium wilt of the three inbred lines were key to detecting differences in wilt risk among soils. Visits to spinach seed crops planted in fields evaluated in the bioassay, as well as test plots of the three inbred lines planted in growers’ seed crops, confirmed the predictive value of the bioassay for Fusarium wilt risk. Correlation analyses for 23 soil properties revealed significant relationships of 15 soil properties with the Fusarium wilt potential of a soil, but the correlations were influenced significantly by susceptibility of the inbred line to Fusarium wilt (13, 10, and 8 soil properties correlated significantly with Fusarium wilt risk for the susceptible, moderate, and partially resistant inbreds, respectively). Multiple regression analyses identified different statistical models for prediction of Fusarium wilt risk depending on the spinach inbred line, but the best fitting model explained <34% of the variability in Fusarium wilt risk among 121 fields evaluated in the soil bioassay. Thus, no model was robust enough to replace the bioassay for the purpose of predicting Fusarium wilt risk.

show abstract

Section: Discussionmentioning

confidence: 99%

A Soil Bioassay for Predicting the Risk of Spinach Fusarium wilt

Gatch

Toit

2015

Plant Disease

View full text Add to dashboard Cite

show abstract

“…Formae speciales of F. oxysporum and F. solani, especially wilt-causing F. oxysporum, often exhibit pronounced host specificity (Booth, 1971). For example, formae speciales that are restricted in host range to a single species (Snyder, 1941) or to subspecific groups within a single species (Armstrong and Armstrong, 1976) have been identified. An alternative model of pathogenicity and host range would be that of F. oxysporum f. sp.…”

Section: Discussionmentioning

confidence: 99%

Effects of European and U.S. Strains of Fusarium spp. Pathogenic to Leafy Spurge on North American Grasses and Cultivated Species

Caesar

Campobasso²,

Terragitti³

1999

Biological Control

View full text Add to dashboard Cite

Abstract:Host-range tests were conducted in a greenhouse using 9 European and 11 U.S. strains of Fusarium spp. pathogenic to Euphorbia spp. Plants of 12 grass species native to the rangelands of North America were raised from seed, planted in soil infested with each strain, and assessed for dry weight after 24 weeks. Five of 11 U.S. strains of Fusarium spp. significantly reduced the dry weight of at least 1 species of grass native to North America. Only 3 native grass species were affected: Idaho fescue (Festuca idahoensis), big bluestem (Andropogon gerardi), and big bluegrass (Poa ampla). Mean reductions ranged from 56 to 92%. A single European strain caused a 53% reduction in dry weight of 1 grass species, sand lovegrass (Eragrostis tichodes). Root-dip assays of 3-week-old seedlings in the greenhouse, with assessment over 3 weeks followed by 9 weeks of further observation and recording of dry weights of surviving plants were used to assess pathogenicity to 27 cultivated plant species. Two of the 3 most virulent U.S. strains failed to cause disease on any crop species according to these criteria. Three U.S. strains were positive in root-dip assays, each to a single crop species, causing vascular discoloration of flax (Linum ussitatissimum) and root necrosis of okra (Hibiscus esculentus) and cotton (Gossypium hirsutum). Neither of the 2 most virulent European strains exhibited pathogenicity to any of 12 crop species. Two other European strains exhibited host ranges comprised of 3 and 4 crop species. Two strains of F. proliferatum from the U.S. and Europe differing in host range were vegetatively compatible. The greater frequency of disease incidence on Euphorbia in Europe and the narrow host range and apparently greater 1

show abstract

“…spinaciae (Sherb) Snyder & Hans. (FOS) is the pathogenic form, which causes wilt disease on plants in the Chenopodiaceae family (Armstrong and Armstrong 1976). In FOS, three vegetative compatibility groups (VCGs; 0330, 0331 and 0332) have been reported (Katan 1999;Katan and Di Primo 1999).…”

Section: Introductionmentioning

confidence: 99%

“…No development of races based on pathogenicity on cultivars of spinach in FOS has been reported. Previously, the pathogen of sugar beet disease was proposed to be FOS race 2 (Armstrong and Armstrong 1976); however, it is generally accepted to be another form, f. sp. betae, because of its difference in host specificity (Fiely et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity of Fusarium oxysporum f. sp. spinaciae in Japan based on phylogenetic analyses of rDNA-IGS and MAT1 sequences

et al. 2007

View full text Add to dashboard Cite

Twenty-eight isolates of Fusarium oxysporum f. sp. spinaciae (FOS; the causal agent of spinach wilt) collected from Japan were assessed for mating type and subjected to phylogenetic analysis. Mating type analysis revealed all isolates to be MAT1-2, suggesting that there is no sexual recombination within the population. Phylogenetic analyses based on nucleotide sequences of the ribosomal DNA intergenic spacer (IGS) and the mating type locus (MAT1) suggested that FOS is polyphyletic. The cluster analysis based on IGS showed four phylogenetic groups (S1-S4) among the isolates. Two distinct lineages, S1 and S3, included FOS isolates both of the vegetative compatibility group (VCG) types, 0330 and 0331, demonstrating that VCG differentiation in FOS may not necessarily reflect the phylogenetic relationships based on IGS and MAT1-2-1.

show abstract

Common Hosts for Fusarium oxysporum formae speciales spinaciae and betae

Cited by 17 publications

References 0 publications

A Soil Bioassay for Predicting the Risk of Spinach Fusarium wilt

A Soil Bioassay for Predicting the Risk of Spinach Fusarium wilt

Effects of European and U.S. Strains of Fusarium spp. Pathogenic to Leafy Spurge on North American Grasses and Cultivated Species

Genetic diversity of Fusarium oxysporum f. sp. spinaciae in Japan based on phylogenetic analyses of rDNA-IGS and MAT1 sequences

Contact Info

Product

Resources

About