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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 #373271
Research Project: Genetic Improvement of Peanut for Production in the Southwest United States Region

Location: Peanut and Small Grains Research Unit

Title: Greenhouse evaluation of wild Arachis species for resistance to Athelia rolfsii

Author
item Bennett, Rebecca
item SIMPSON, CHARLES - Texas A&M Agrilife
item Tallury, Shyamalrau - Shyam
item PICKERING, AUSTIN - Oklahoma State University
item WANG, NING - Oklahoma State University

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 3/23/2020
Publication Date: 12/30/2020
Citation: Bennett, R.S., Simpson, C.E., Tallury, S., Pickering, A., Wang, N. 2020. Greenhouse evaluation of wild Arachis species for resistance to Athelia rolfsii [abstract]. Proceedings: American Phytopathology Society Annual Meeting, 8/8-8/12/2020, Denver, Colorado. Phytopathology. 110(12S):S2.1-S2.206, pg.60. https://doi.org/10.1094/PHYTO-110-12-S2.1.
DOI: https://doi.org/10.1094/PHYTO-110-12-S2.1

Interpretive Summary:

Technical Abstract: Athelia rolfsii (Curzi) C.C. Tu & Kimbr. is the one of the most damaging pathogens of cultivated peanut, causing the soilborne disease known regionally as white mold, stem blight, or southern blight. Because the genetic base for cultivated peanut is narrow, wild Arachis species may possess novel sources of disease resistance. We evaluated 18 accessions representing 15 Arachis species (batizcoi, benensis, cardenasii, correntina, cruziana, diogoi, duranensis, herzogii, hoehnei, kempff-mercadoi, kuhlmannii, microsperma, monticola, simpsonii, williamsii) in the greenhouse for resistance to Athelia rolfsii. Inoculations were conducted on intact plants propagated from rooted cuttings, using actively growing mycelial plugs. Plants were maintained in an enclosed chamber with high humidity, and lesion length was measured at 4, 6, 10, and 12 days after inoculation. Preliminary results indicate that Arachis batizcoi (PI 468326), Ar. monticola (PI 497260), and Ar. batizocoi (PI PI468327) produced the longest lesions with a mean lesion length >40 mm at 12 days after inoculation. Arachis microsperma (PI 666096 and PI 674407), Ar. diogoi (PI 468354), and Ar. simpsonii (PI 688957) were among the more resistant entries, along with the resistant controls Georgia-03L and U.S. mini-core entry CC650 (PI 478819), with mean lesion lengths <16 mm at 12 days after inoculation. These results should be useful to peanut breeders seeking additional sources of resistant to Athelia rolfsii.