Reaction of Soybean Cultivars to Sclerotinia Stem Rot in Field, Greenhouse, and Laboratory Evaluations

Kim, H. S.; Hartman, G. L.; Manandhar, J. B.; Graef, George L.; Steadman, James R.; Diers, Brian W.

doi:10.2135/cropsci2000.403665x

Cited by 116 publications

(84 citation statements)

References 14 publications

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“…Even with irrigation and inoculation, soybean genotypes vary in canopy architecture, flowering date, and lodging, all of which affect disease development (Boland & Hall, 1987;Miklas et al, 2003;Bolton et al, 2006). Greenhouse and laboratory evaluations are often performed and are an integral part of resistance screening methodology for S. sclerotiorum (Kim et al, 2000;Vuong et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Mycelial compatibility and aggressiveness of Sclerotinia sclerotiorum isolates from Brazil and the United States

Koga

Bowen

Godoy

et al. 2014

Pesq. agropec. bras.

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-The objective of this work was to evaluate the genetic diversity among Sclerotinia sclerotiorum isolates from Brazil and the USA, assess their aggressiveness variability, and verify the existence of an isolate-cultivar interaction. Isolate variability was determined by mycelial compatibility grouping (MCG), and isolate aggressiveness by cut-stem inoculations of soybean cultivars. Two experiments for MCGs and two for aggressiveness were conducted with two sets of isolates. The first set included nine isolates from the same soybean field in Brazil and nine from the Midwest region of the USA. The second set included 16 isolates from several regions of Brazil and one from the USA. In the first set, 18 isolates formed 12 different MCGs. In the second set, 81% of the isolates from Brazil grouped into a single MCG. No common MCGs were observed among isolates from Brazil and the USA. The isolates showed aggressiveness differences in the first set, but not in the second. Although aggressiveness differed in the first set, soybean cultivars and isolates did not interact significantly. Cultivar rank remained the same, regardless of the genetic diversity, aggressiveness difference, and region or country of origin of the isolate. Results from screening of soybean cultivars, performed by the cut-stem method in the USA, can be used as reference for researchers in Brazil.Index terms: Glycine max, Sclerotinia stem rot, disease resistance, screening of cultivars, white mold. Termos para indexação: Glycine max, podridão-de-esclerotinia, resistência a doenças, seleção de cultivares, mofo-branco. Compatibilidade micelial e agressividade de isolados de Sclerotinia sclerotiorum do Brasil e dos Estados Unidos

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Section: Introductionmentioning

confidence: 99%

Mycelial compatibility and aggressiveness of Sclerotinia sclerotiorum isolates from Brazil and the United States

Koga

Bowen

Godoy

et al. 2014

Pesq. agropec. bras.

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“…Disease control is mainly based on cultural practices such as reduced or no till systems and crop rotations with corn and cereals (Anderson 1996). Several studies have reported partial resistance among soybean lines and cultivars grown in the northeastern United States and Canada (Cline and Jacobsen 1983;Boland and Hall 1986;Zhang 1995;Kim et al 2000). However complete resistance was not reported.…”

Section: Mots Clésmentioning

confidence: 99%

“…A variety of inoculation methods have been reported to accurately evaluate SSR response in soybean. Inoculation methods were performed on whole plant with mycelium (Kim et al 2000) or ascospores (Cline and Jacobsen 1983), or on excised plant parts with mycelium or oxalic acid, a major determinant of S. sclerotiorum's virulence used to indirectly evaluate the effects of the fungus on soybean explants (Wegulo et al 1998). None of these methods are completely satisfying because they are destructive (e.g., explant methods) or produce inconsistent results due to the variability of inoculum, inoculation method or environmental factors.…”

Section: Mots Clésmentioning

confidence: 99%

“…DAI, days after inoculation; sDSI, four-class DSI of soil infestation with sclerotia; mDSI, three-class DSI of flower inoculation with mycelium; aDSI 25 DAI and aDSI 14 DAI, respectively; three-class and six-class DSI of flower inoculation with ascospores. Trial 1: 12 cultivars selected from 1998 greenhouse stem inoculation with mycelium plus S19-90 as resistant control (Wegulo et al 1998;Kim et al 2000); trial 2: Maple Donovan and S00-66 compared to four cultivars from previous studies (Grau et al 1982;Cline and Jacobsen 1983;Chun et al 1987;Wegulo et al 1998;Kim et al 2000). Fehr et al 1971) per plot were transferred into a greenhouse section where the temperature was kept constant at 25°C and the RH 100%.…”

Section: Inoculation Of Wounded Stem With Myceliummentioning

confidence: 99%

“…In January 2000, the mycelium stem inoculation was repeated twice in the greenhouse. Trial 1 comprised 13 genotypes: 12 soybean genotypes selected from the 1998 trials for their typical and more consistent response to inoculation methods, along with cultivar S19-90 as the resistant control (Kim et al 2000;Wegulo et al 1998) (Table 1). Trial 2 was performed on six genotypes in order to compare the most resistant (Maple Donovan) and susceptible (S00-66) cultivars in this study with previously tested cultivars, which included two susceptible cultivars, Gnome (Chun et al 1987) and Elf (Cline and Jacobsen 1983) and two resistant cultivars, Corsoy 79 and Hodgson 78 (Chun et al 1987).…”

Section: Inoculation Of Wounded Stem With Myceliummentioning

confidence: 99%

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Greenhouse and field assessments of resistance in soybean inoculated with sclerotia, mycelium, and ascospores of Sclerotinia sclerotiorum

Rousseau¹,

Thanh²,

Dostaler³

et al. 2004

Can. J. Plant Sci.

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, S. 2004. Greenhouse and field assessments of resistance in soybean inoculated with sclerotia, mycelium, and ascospores of Sclerotinia sclerotiorum. Can. J. Plant Sci. 84: 615-623. Thirty-five soybean lines were evaluated for sclerotinia stem rot (SSR) resistance using stem inoculations with mycelium in the field and greenhouse, flower inoculations with mycelium or ascospores in the field and greenhouse, and soil infestation with sclerotia in the field, between 1997 and 2000. Symptoms were evaluated by stem lesion length (SLL, mm) and lesion extension (LE, mm) after stem inoculations; infected flowers (IF, %) and a disease severity index (DSI, %) after flower inoculations with ascospores and mycelium; and a DSI after soil infestation with sclerotia. Results show significant differences among lines for SLL and LE in the greenhouse and for IF and DSI in the field and greenhouse. Significant correlations were found between stem inoculation and sclerotia method and between all trials with flower inoculation using either ascospores or mycelium. Maple Donovan and Frisquet were the least susceptible genotypes after flower inoculations with ascospores, whereas OAC Bayfield was the most susceptible. Maple Donovan was also the least susceptible genotype after mycelium stem inoculation in the trials in 2000, while OAC Bayfield was again the most susceptible. Nattosan was the most susceptible genotype in trials conducted in the fields infested with sclerotia. In this study, flower inoculations provided better discrimination than stem inoculations in the assessment of soybean genotypes for SSR resistance, and the results suggested two phenotypes of partial or incomplete resistance, one occurring in the flower, and the other in the stem.

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Semi‐interpenetrating polymer networks based on polyurethane ionomer/poly(vinyl chloride)

2004

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Semi-interpenetrating polymer networks (IPNs) have been prepared from polyurethane anionomers and poly(vinyl chloride) using sequential polymerization technique. These IPNs were compression molded and obtained as tough films. The hydrogen bonding interaction, glass transition temperature, and thermal stabilities were discussed based on Fourier-transform infrared spectrophotometer, differential scanning calorimetry, and thermogravimetric analysis. Morphology of the IPNs was characterized by scanning electron microscope and it reveals the formation of compatible IPNs. Tensile strength and hardness increase with increasing NCO/OH ratio and ionic

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Reaction of Soybean Cultivars to Sclerotinia Stem Rot in Field, Greenhouse, and Laboratory Evaluations

Abstract: Simple sequence repeat markers developed from maize se-cytological mapping in rye (Secale cereale L.). p. 121-122 In P.E. McGuire and C.O. Qualset (ed.) Progress in genome mapping of quences found in the GENBANK database: Map construction.

Cited by 116 publications

References 14 publications

Mycelial compatibility and aggressiveness of Sclerotinia sclerotiorum isolates from Brazil and the United States

Mycelial compatibility and aggressiveness of Sclerotinia sclerotiorum isolates from Brazil and the United States

Greenhouse and field assessments of resistance in soybean inoculated with sclerotia, mycelium, and ascospores of Sclerotinia sclerotiorum

Semi‐interpenetrating polymer networks based on polyurethane ionomer/poly(vinyl chloride)

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