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Kelechi Ogbuji, Gloria S. McCutcheon, Alvin M. Simmons, Maurice E. Snook, Howard F. Harrison, and Amnon Levi

Watermelon [ C. lanatus var. lanatus (Thunbs) Matsum & Nakai] is an important crop globally. The origin of Citrullus spp. is in central or southern Africa ( Jarret et al., 1997 ; Mujaju et al., 2010 ). On that continent, a wide variation of

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Howard F. Harrison Jr., Chandrasekar S. Kousik, and Amnon Levi

objective of this study was to evaluate clomazone tolerance in a diverse germplasm collection of watermelon cultivars and germplasm accessions of Citrullus lanatus and closely related species. Subsequent greenhouse and field experiments were conducted to

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Judy A. Thies and Amnon Levi

material. Twenty-six accessions of C. lanatus var. citroides , one accession of C. lanatus var. lanatus , and three accessions of C . colocynthis from the U.S. PI Citrullus germplasm collection were evaluated for resistance to M. incognita

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Ming Ding, Beibei Bie, Wu Jiang, Qingqing Duan, Hongmei Du, and Danfeng Huang

Watermelon [ Citrullus lanatus (Thunb.) Matsum. and Nakai] seedlings are the main product of the seedling companies in China. With the increases in the cultivation area of watermelon (2.2 million ha in China and 3.8 million ha in the world

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Qingqing Duan, Ye Lin, Wu Jiang, and Danfeng Huang

Watermelon [ Citrullus lanatus (Thunb.) Matsum. and Nakai] is an important cucurbit crop, occupying 7% of the worldwide area allocated for vegetable production ( Guo et al., 2013 ). China, as the largest producer of watermelons in the world

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W. Patrick Wechter, Chandrasekar Kousik, Melanie McMillan, and Amnon Levi

effective in controlling this soilborne disease. Finding resistant germplasm sources and incorporating the resistance into watermelon cultivars should be the most effective strategy for controlling FW in watermelon. Two U.S. PIs of Citrullus lanatus var

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Geoffrey Meru and Cecilia E. McGregor

.T. Vodouhe, R.S. Coulibaly, O. Ahanchede, A. 2008 Importance and practices of egusi crops [ Citrullus lanatus (Thunb.) Matsum. & Nakai, Cucumeropsis mannii Naudin and Lagenaria siceraria (Molina) Standl. cv. ‘Aklamkpa’] in sociolinguistic areas in Benin

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Judy A. Thies, Jennifer J. Ariss, Richard L. Hassell, Sharon Buckner, and Amnon Levi

watermelon. Rootstock genotypes. Seedless watermelon ‘Tri-X 313’ was grafted onto five wild watermelon ( Citrullus lanatus var. citroides ) germplasm lines developed at the U.S. Vegetable Laboratory (RKVL 301, RKVL 302, RKVL 303, RKVL 316, and RKVL 318

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R.L. Jarret, S. Kresovich, T. Holms, Janelle Evans, and Z. Liu

Simple sequence repeats (SSRs) were isolated from a size-fractionated genomic DNA library of watermelon (Citrullus lanatus L. cv. New Hampshire Midget). Screening of the library with five oligonucleotide probes, including (GT)11, (AT)11, (CT)11, (GC)11, and (TAA)8, detected the occurrence of 96 positive colonies among ≈8000 recombinants. Automated DNA sequencing revealed the presence of SSRs. PCR primer pairs homologous to the regions flanking the SSR loci were synthesized commercially and used to screen 56 watermelon genotypes for the occurrence of SSR polymorphisms. Amplification products were separated using nondenaturing PAGE. Eighty percent of the primer pairs produced amplification products of the expected size and detected polymorphisms among the genotypes examined. The use of SSRs for watermelon germplasm characterization is discussed.

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Judy A. Thies, Sharon Buckner, Matthew Horry, Richard Hassell, and Amnon Levi

USDA, ARS maintains 134 U.S. PIs of the wild-type watermelon Citrullus lanatus var. citroides collected in Africa, which is considered the possible center of origin of watermelon ( Jarret et al., 1997 ). In previous studies, we identified a