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Branch, W. D., and Culbreath, A. K. 2015. Stability of TSWV general field resistance in the ‘Georgia Green’ peanut cultivar. Plant Health Progress doi:10.1094/PHP-RS-15-0007. There are mainly two types of host-plant disease resistance. General or horizontal resistance is usually controlled by several genes each acting with minor additive effects, and specific or vertical resistance is usually controlled by one or two genes with a dominant major effect. In most cases, general resistance may not provide as high a level of control as specific; however, general type of resistance is usually more desirable for long-term stability. Therefore, the objective of this 13-year study was to determine the stability of the general disease resistance to tomato spotted wilt (TSW), caused by Tomato spotted wilt virus (TSWV), found in the peanut (Arachis hypogaea L.) cultivar ‘Georgia Green’, as indicated by comparisons with the highly susceptible ‘Florunner’ cultivar. The general host-plant TSWV resistance of Georgia Green was found to have consistently lower TSW at mid-season and total disease (primarily TSW and any soilborne disease) incidence at late season, respectively, and higher pod yield compared to Florunner across all 13 years without any genotype-by-year (G×Y) interaction for these variables. Consequently, the general TSWV-resistance of Georgia Green was found to be highly stable across many years, and should be utilized for progress in breeding improved TSWV-resistant peanut cultivars.

Stability of TSWV General Field Resistance in the ‘Georgia Green’ Peanut Cultivar