Phiri, T.M.; Bhattarai, G.; Chiwina, K.E.; Fan, Q.; Xiong, H.; Alatawi, I.; Dickson, R.; Joshi, N.K.; Rojas, A.; Ling, K.-S.; Shi, A. An Evaluation of Bacterial Wilt (Ralstonia solanacearum) Resistance in a Set of Tomato Germplasm from the United States Department of Agriculture. Agronomy2024, 14, 350.
Phiri, T.M.; Bhattarai, G.; Chiwina, K.E.; Fan, Q.; Xiong, H.; Alatawi, I.; Dickson, R.; Joshi, N.K.; Rojas, A.; Ling, K.-S.; Shi, A. An Evaluation of Bacterial Wilt (Ralstonia solanacearum) Resistance in a Set of Tomato Germplasm from the United States Department of Agriculture. Agronomy 2024, 14, 350.
Phiri, T.M.; Bhattarai, G.; Chiwina, K.E.; Fan, Q.; Xiong, H.; Alatawi, I.; Dickson, R.; Joshi, N.K.; Rojas, A.; Ling, K.-S.; Shi, A. An Evaluation of Bacterial Wilt (Ralstonia solanacearum) Resistance in a Set of Tomato Germplasm from the United States Department of Agriculture. Agronomy2024, 14, 350.
Phiri, T.M.; Bhattarai, G.; Chiwina, K.E.; Fan, Q.; Xiong, H.; Alatawi, I.; Dickson, R.; Joshi, N.K.; Rojas, A.; Ling, K.-S.; Shi, A. An Evaluation of Bacterial Wilt (Ralstonia solanacearum) Resistance in a Set of Tomato Germplasm from the United States Department of Agriculture. Agronomy 2024, 14, 350.
Abstract
Bacterial wilt (BW), caused by Ralstonia solanacearum, is one of the devastating diseases of tomatoes (Solanum lycopersicum L.). The use of resistant cultivars and breeding for genetic resistance is the most effective, economical, and environmentally friendly management strategy for this disease. It is necessary to screen diverse germplasm and cultivated genotypes to identify resistant resources and to develop resistant cultivars in tomatoes to combat the changing pathogen isolates. This study evaluated 40 United States Department of Agriculture (USDA) tomato accessions for their BW resistance to R. solanacearum isolate P822 under greenhouse conditions. The tomato plants were inoculated and visually assessed to observe symptoms and disease severity was scored on a scale of 0 to 4 (0 = no leaf wilted, 1 = 25% of leaves wilted, 2 = 50% leaves wilted, 3 = 75% of leaves wilted, 4 = 100% leaves wilted). Five accessions PI 645370, PI 647306, PI 600993, PI 355110, and PI 270210 were observed as BW resistance with PI 645370 showing the greatest resistance. The broad-sense heritability was estimated as 59.9% based on a 0-4 scale of disease incidence and 42.8% based on the disease severity index for BW resistance. Two distinct clusters (sub-populations) were detected among 39 of the 40 accessions, consisting of 3 and 2 BW resistant accessions in each cluster, respectively, suggesting differences in the genetic base in the five resistance accessions. The resistant accessions will contribute significantly to the tomato breeding program to develop new cultivars with BW resistance.
Biology and Life Sciences, Agricultural Science and Agronomy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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