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ARS Home » Plains Area » El Reno, Oklahoma » Oklahoma and Central Plains Agricultural Research Center » Peanut and Small Grains Research Unit » Research » Publications at this Location » Publication #367041
Research Project: Genetic Improvement of Peanut for Production in the Southwest United States Region

Location: Peanut and Small Grains Research Unit

Title: Screening of the Argentinean INTA peanut core collection with a molecular marker associated with resistance to Sclerotinia minor Jaggar

Author
item Chamberlin, Kelly
item BALDESSARI, JORGE - NATIONAL INSTITUTE OF AGRICULTURAL TECHNOLOGY(INTA)
item MAMANI, EVA - NATIONAL INSTITUTE OF AGRICULTURAL TECHNOLOGY(INTA)
item MORENO, MARIA - NATIONAL INSTITUTE OF AGRICULTURAL TECHNOLOGY(INTA)

Submitted to: Peanut Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/17/2020
Publication Date: 7/1/2020
Citation: Chamberlin, K.D., Baldessari, J., Mamani, E.M., Moreno, M.V. 2020. Screening of the Argentinean INTA peanut core collection with a molecular marker associated with resistance to Sclerotinia minor Jaggar. Peanut Science. (47)1:9-16. https://doi.org/10.3146/PS19-15.1.
DOI: https://doi.org/10.3146/PS19-15.1

Interpretive Summary: Sclerotinia blight on peanut is a major profit-limiting disease in many peanut production regions including Argentina. The Argentinean INTA core collection is composed of 154 accessions that represent the genetic diversity of the complete collection which has over 3500 accessions. Screening of the INTA core collection with a molecular marker associated with Sclerotinia blight resistance will reduce the effort of phenotyping in the field by over 50% by identifying those accessions with potential for resistance. In this study the Argentinean INTA core collection was genotyped using a marker for resistance to Sclerotinia blight in peanut. Accessions from each botanical variety type represented in the core collection were identified as new potential sources of resistance and targeted for further evaluation in field tests for Sclerotinia blight resistance. Accessions identified in this study may be useful for improving Sclerotinia blight resistance in existing cultivars around the world.

Technical Abstract: Cultivated peanut, 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 many countries and can reduce yield by up to 50% in severely infested fields. Host plant resistance will provide the most effective solution to managing Sclerotinia blight, but 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. The objective of this study was to genotype the peanut core collection of the Instituto Nacional de Tecnología Agropecuaria (INTA) Manfredi, Argentina, with a molecular marker associated with Sclerotinia blight resistance. One hundred and fifty-four (154) accessions from the collection were available and genotyped using the SSR marker. Accessions from each botanical variety type represented in the core collection were identified as new potential sources of resistance and targeted for further evaluation in field tests for Sclerotinia blight resistance.