Evaluation of ten peanut genotypes for resistance to Peanut bud necrosis virus (PBNV)

Kesmala, T., Jogloy, S., Wongkaew, S., Akkasang, C., and Patanothai, A. Evaluation of ten peanut genotypes for resistance to Peanut bud necrosis virus (PBNV) Songklanakarin J. Sci. Technol., 2006, 28(3) : 459-467 Reactions of peanut genotypes to Peanut bud necrosis virus (PBNV) under sap-inoculation and natural field conditions may be different. Ten peanut genotypes (KK 60-3, KKU 72-1, KKU 72-2, Luhua 11, Tainan 9, JL 24, IC 10, IC 34, ICGV 86031 and ICGV 86388) were evaluated for their reactions to PBNV under field conditions in Thailand in 2001. The objectives of this study were (i) to determine breeding potential of the selected peanut genotypes in terms of PBNV disease resistance, and (ii) to explore the usefulness of disease incidence, disease score and area under disease progress curve (AUDPC) as the assessments of resistance for effectively discriminating susceptible and resistant genotypes of peanut. Significant differences were found between susceptible and resistant peanut genotypes as identified by disease incidence, disease score and AUDPC. Disease score and AUDPC tended to be equally effective and slightly better than disease incidence in identifying peanut genotypes resistant to PBNV. None of the resistance parameters could differentiate ORIGINAL ARTICLE 1M.Sc.(Plant Breeding), Researcher, 2Ph.D.(Plant breeding), Assoc. Prof., 4Ph.D.(Plant Physiology), Assoc. Prof., 5Ph.D.(Plant Breeding), Prof., Department of Agronomy, Faculty of Agriculture, Khon Kaen University, Khon Kaen, 40002 Thailand. 3Ph.D.(Plant Pathology), School of Crop Production Technology, Institute of Agriculture Technology, Suranaree University of Technology, Nakhon Ratchasima, 30000 Thailand. Corresponding e-mail: [email protected] Received, 15 July 2005 Accepted, 13 November 2005 Songklanakarin J. Sci. Technol. Vol.28 No.3 May Jun. 2006 460 Evaluation of ten peanut genotypes for resistance to PBNV