Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: March 1, 2004
Publication Date: December 31, 2004
Citation: Rowland, D., Dorner, J.W., Sorensen, R.B., Beasley, J., Todd, J. The progression of tomato spotted wilt virus through peanut tissue types and the resultant physiological effects as related to severity of viral infection. American Peanut Research and Education Society Abstracts. www.apres.okstate.edu. Interpretive Summary: Not required.
Technical Abstract: Much has been speculated about whether certain physiological characteristics in peanut varieties enable more resistant varieties to withstand tomato spotted wilt virus (TSWV) infection better than others. In order to address this question, we grew three peanut varieties, Georgia Green, NC-V11, and ANorden, using production practices that favored the development of TSWV. We examined the progression of TSWV infection at 2-3 week intervals through the season using ELISA tests in different tissue types: roots, leaves, and pods. We then correlated physiological function at various growth stages with the extent of TSWV infection within a plant. Plants were classed into three severity categories: 1) no TSWV symptoms or previous positive ELISA tests; 2) less than 50% of leaf tissue exhibiting TSWV symptoms; and 3) greater than 50% of leaf tissue symptomatic. Further, we examined gas exchange physiology in both symptomatic and asymptomatic leaves on a single plant. Photosynthesis was reduced by an average of 22% in the mid-severity class and by 34% in the high-severity class as compared to non-infected plants across all three varieties. Symptomatic leaf tissue had 51% lower photosynthetic rates than healthy leaves. There were differences among varieties within symptomatic classes with ANorden and NC-V11 maintaining higher average photosynthetic levels than Georgia Green. This ability to maintain high assimilation physiology may help varieties withstand TSWV infection and maintain final yields.