Heritability of spotted wilt resistance in a Florida‐EP™ “113”‐derived peanut (Arachis hypogaea) population |
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| Authors: | Yu‐Chien Tseng Barry L Tillman Salvador A Gezan Jianping Wang Diane L Rowland |
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| Institution: | 1. Agronomy Department, University of Florida, Gainesville, Florida;2. North Florida Research and Education Center, University of Florida, Marianna, Florida;3. School of Forest Resources and Conservation, University of Florida, Gainesville, Florida |
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| Abstract: | Spotted wilt, caused by tomato spotted wilt virus (TSWV), is a major disease of peanut (Arachis hypogaea ) in the south‐eastern United States. Cultivar resistance is the most important factor in disease control. However, spotted wilt resistance in current cultivars still carries risk in the absence of other practices when disease is severe. In contrast, a newly developed cultivar, Florida‐EP? “113,” has demonstrated excellent resistance even when spotted wilt is severe. Information on heritability of this resistance can help breeders better utilize it in breeding. F2‐derived populations from the cross Florida‐EP? “113”/Georgia Valencia were developed and tested in field experiments in Florida from 2012 to 2014. Disease symptoms were evaluated visually, and the frequency of TSWV infection was measured by ImmunoStrip®. Heritability estimated from ImmunoStrip® was higher (0.66) compared to visual ratings (0.48). Genetic correlations among evaluation methods (r A = 0.92–0.99) and environments (r B = 0.86–0.99) were high. These results indicate that resistance in Florida‐EP? “113” is highly heritable and that selection in a high disease risk environment is feasible without significant erosion of genetic gain. |
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| Keywords: | disease resistance breeding genetic correlation genotype‐by‐environment interaction heritability peanut (Arachis hypogaea) tomato spotted wilt virus |
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