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Relationships among symptoms of spotted wilt disease of peanut and their potential impact on crop productivity and resistance breeding
Author(s) -
Tillman Barry L.,
McKinney Justin Lee
Publication year - 2018
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12638
Subject(s) - biology , tomato spotted wilt virus , crop , incidence (geometry) , breeding program , wilt disease , tospovirus , horticulture , agronomy , veterinary medicine , plant virus , virus , medicine , cultivar , immunology , physics , optics
Symptoms of spotted wilt of peanut were evaluated in a field experiment over three years (2010–2012) near Marianna, Florida. Assessment included three visual measures of disease and ImmunoStrip (a form of ELISA ) testing of root crowns for the presence of Tomato spotted wilt virus ( TSWV ), the causal agent of spotted wilt in peanut. Foliar symptoms of spotted wilt on a 1 to 10 scale and on a disease incidence rating ( DIR ) were highly correlated ( r = 0.88; p < 0.001). Foliar symptoms were moderately correlated (0.45 < r < 0.54; p < 0.001) with TSWV infection. However, symptoms on the testa were highly correlated with TSWV infection ( r = 0.78; p < 0.001). These results indicate that foliar symptomology is less reliable in assessing TSWV infection than testa symptomology. Regression analysis showed that foliar symptoms underestimated the proportion of plants infected by TSWV . Seed inspection may be a good predictor of plant infection and therefore useful in breeding programmes because it is much less expensive than ELISA . Resistance to TSWV infection is characteristic of some resistant peanut genotypes and a lack of testa symptomology could help to identify those genotypes.