Inheritance of Resistance to <i>Sclerotinia minor</i> in Selected Spanish Peanut Crosses1

Wildman, L.; Smith, O. D.; Simpson, C. E.; Taber, Ruth Ann

doi:10.3146/i0095-3679-19-1-8

Cited by 20 publications

(18 citation statements)

References 3 publications

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“…These results are consistent with previous studies which have indicated a quantitative behavior under Weld testing (Wildman et al 1992;Goldman et al 1995). There seems to be a distinct dosage eVect occurring where the 145 bp band alone provides high levels of resistance, the 100 bp band alone presents considerable susceptability, while a combination of the two confers moderate resistance.…”

Section: Resultssupporting

confidence: 94%

“…However, the mechanism of resistance among Spanish types is not purely morphological since the Spanish cultivars Pronto and Spanco are as susceptible as many runner types, suggesting contribution by a genetic component. Inheritance of the resistance trait has not been well studied but Wildman et al (1992) suggested that at least two loci were involved in Sclerotinia blight resistance among genotypes studied. Cytoplasmic factors have also been suggested to be involved in Sclerotinia blight resistance (CoVelt and Porter 1982).…”

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confidence: 98%

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Discovery and characterization of a molecular marker for Sclerotinia minor (Jagger) resistance in peanut

Chenault¹,

Maas²,

Damicone

et al. 2008

Euphytica

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The production of cultivated peanut, an important agronomic crop throughout the United States and the world, is consistently threatened by various diseases and pests. Sclerotinia minor Jagger (S. minor), the causal agent of Sclerotinia blight, is a major threat to peanut production in the Southwestern US, Virginia and North Carolina. Although information on the variability of morphological traits associated with Sclerotinia blight resistance is plentiful, no molecular markers associated with resistance have been reported. The identiWcation of markers would greatly assist peanut geneticists in selecting genotypes to be used in breeding programs. The main objective of this work was to use simple sequence repeat (SSR) primers previously reported for peanut to identify a molecular marker associated with resistance to S. minor. Out of 16 primer pairs used to examine peanut genomic DNA from 39 diVerent genotypes, one pair produced bands at approximately 145 and 100 bp, consistent with either S. minor resistance or susceptibility, respectively. Cloning and sequencing of these bands revealed the region is well conserved among all genotypes tested with the exception of the length of the SSR region, which varies with disease resistance levels. This is the Wrst report of a molecular marker associated with resistance to Sclerotinia blight in peanut. The identiWcation of this marker and development of a PCR-based screening method will prove to be extremely useful to peanut breeders in screening germplasm collections and segregating populations as well as in pyramiding S. minor resistance with other desirable traits into superior peanut lines. Abbreviations ABLAdvanced breeding line AFLP AmpliWed fragment length polymorphism QTL Quantitative trait loci RAPD Random ampliWed polymorphic DNA RFLP Restriction fragment length polymorphism SCAR Sequence characterized ampliWed region SSR Simple sequence repeat Cultivated peanut (Arachis hypogaea L.) is a selfpollinated allotetraploid (2n = 4x = 40), which is

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Section: Resultssupporting

confidence: 94%

mentioning

confidence: 98%

Discovery and characterization of a molecular marker for Sclerotinia minor (Jagger) resistance in peanut

Chenault¹,

Maas²,

Damicone

et al. 2008

Euphytica

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show abstract

“…The 145 pb band for resistance was frequently found in prostrate plant types, possibly indicating the involvement of physiologic resistance. Inheritance of resistance to Sclerotinia blight using TX-AG5 is not clearly understood but appears to be controlled by at least two loci (37) with low to moderate heritability estimates ranging from 14 to 47% (7,37). The use of molecular marker technology during a recurrent backcrossing program may expedite the development of cultivars with improved resistance to Sclerotinia blight using the sources of resistance identified in this study and those yet to be identified in the entire peanut collection.…”

Section: ---------------2-6 ---------------------------------------% mentioning

confidence: 99%

Reaction of the Core Collection of Peanut Germplasm to Sclerotinia Blight and Pepper Spot1

Damicone¹,

Holbrook²,

Smith³

et al. 2010

Peanut Science

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In 2001, entries from the peanut core collection, a subset of the USDA peanut germplasm collection, were planted in non-replicated plots in a field with a history of Sclerotinia blight caused by Sclerotinia minor. Variability existed among entries for reaction to Sclerotinia blight. Of the 744 entries evaluated, 11% had no disease, nearly 30% had ,10% disease incidence, and only 21% had 50% disease incidence or more. Most of the resistant entries had an upright growth habit and were in early and mid-maturity groups. Many of the early maturing entries were susceptible to the foliar disease pepper spot which occurred throughout the study. Entries were selected for further evaluation in replicated plots based on a nil to low (,10% 208, 128, 804, 582, and 273 combined resistance to Sclerotinia blight, pepper spot, and web blotch with less than erect growth habits. Entry 103 had good Sclerotinia blight resistance and yield, but an upright growth habit. Entry 92 had an upright growth habit and low yield, but good Sclerotinia blight resistance. Entries 92 and 103 had upright growth habits but were among the best entries for resistant to pepper spot and web blotch. Entries 426, 184, and 562 were upright and susceptible to pepper spot, but had resistance to web blotch and the best resistance to Sclerotinia blight. These entries appear to be useful sources of resistance to Sclerotinia blight for breeding programs and for increasing the probability of finding additional sources of resistance in clusters of germplasm identified within the entire USDA collection.

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“…The inheritance mechanism of host resistance is not well understood. Wildman et al (1992) suggested that at least two loci were involved in Sclerotinia blight resistance among genotypes studied. Cytoplasmic factors have also been suggested to be involved in Sclerotinia blight resistance (Coffelt and Porter 1982).…”

Section: Introductionmentioning

confidence: 96%

Evaluation of the U.S. peanut mini core collection using a molecular marker for resistance to Sclerotinia minor Jagger

Chamberlin¹,

Melouk²,

Payton

2009

Euphytica

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Cultivated peanut, the second most economically important legume crop throughout the United States and the third most important oilseed in the world, is consistently threatened by various diseases and pests. Sclerotinia minor Jagger (S. minor), the causal agent of Sclerotinia blight, is a major threat to peanut production in the Southwestern U.S., Virginia, and North Carolina and can reduce yield by up to 50% in severely infested fields. Although host plant resistance would provide the most effective solution to managing Sclerotinia blight, limited sources of resistance to the disease are available for use in breeding programs. Peanut germplasm collections are available for exploration and identification of new sources of resistance, but traditionally the process is lengthy, requiring years of field testing before those potential sources can be identified. Molecular markers associated with phenotypic traits can speed up the screening of germplasm accessions, but until recently none were available for Sclerotinia blight resistance in peanut. This study objective of this study was to characterize the US peanut mini-core collection with regards to a recently discovered molecular marker associated with Sclerotinia blight resistance. Ninetysix accessions from the collection were available and genotyped using the SSR marker and 39 total accessions from spanish, valencia, runner market types were identified as new potential sources of resistance and targeted for further evaluation in field tests for Sclerotinia blight resistance.

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Inheritance of Resistance to Sclerotinia minor in Selected Spanish Peanut Crosses1

Cited by 20 publications

References 3 publications

Discovery and characterization of a molecular marker for Sclerotinia minor (Jagger) resistance in peanut

Discovery and characterization of a molecular marker for Sclerotinia minor (Jagger) resistance in peanut

Reaction of the Core Collection of Peanut Germplasm to Sclerotinia Blight and Pepper Spot1

Evaluation of the U.S. peanut mini core collection using a molecular marker for resistance to Sclerotinia minor Jagger

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