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High frequency oligonucleotides: targeting active gene (HFO-TAG) markers revealed wide genetic diversity among Citrullus spp. accessions useful for enhancing disease or pest resistance in watermelon cultivars

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Abstract

There is a continuous need to enhance watermelon cultivars for disease and pest resistance. Different U.S. Plant Introductions (PIs) of Citrullus lanatus subsp. lanatus var. lanatus [also known as C. lanatus (Thunb.) Matsum. et Nakai subsp. lanatus var. citroides (Bailey) Mansf. ex Greb.] (CLC) collected in southern Africa are a useful source for enhancing disease or pest resistance in watermelon cultivars. They are also valuable as rootstocks for grafted watermelon, particularly in fields infested with root-knot nematodes or Fusarium wilt. However, there is little information about genetic relationships among these PIs. In this study, genetic diversity was examined among 74 CLC PIs collected from their center of origin in southern Africa. Also, 15 Citrullus lanatus subsp. lanatus (CLL) PIs and the American heirloom cultivars Charleston Gray and Black Diamond (Citrullus lanatus subsp. vulgaris (Schrader ex Eckl. et Zeyh.) Fursa) (CLV) and five Citrullus colocynthis (L.) Schrader (CC) PIs collected in different locations throughout the world were used as out-groups in the phylogenetic analysis for the CLC PIs. Twenty-three high frequency oligonucleotides—targeting active gene (HFO-TAG) primers were used in polymerase chain reaction (PCR) experiments to produce a total of 562 polymorphic markers among the Citrullus PIs and cultivars. Cluster and multidimensional scaling plot analysis produced distinct groups of CLC, CLL, and CC PIs. Several PIs that were designated as CLC or CLL were in transitional positions, indicating that they are the result of gene flow between the major Citrullus groups or subgroups. Population structure analysis indicated that CLC comprises two subgroups; each containing a set of unique alleles. Also, unique alleles exist in the CLL and the CC genotypes. Overall, broad genetic diversity exists among the Citrullus PIs. The data in this study should be useful for identifying PIs with a wide genetic distance between them that could be used in breeding programs aiming to develop heterotic F1 hybrid rootstock lines for grafted watermelon.

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Acknowledgment

We thank Laura Massey and Richard Crawford for their excellent technical assistance.

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Authors and Affiliations

  1. USDA, ARS, U.S. Vegetable Laboratory 2700 Savannah Highway, Charleston, SC, 29414, USA

    Amnon Levi, Judy A. Thies, W. Patrick Wechter, Howard F. Harrison & Alvin M. Simmons

  2. Department of Biology, Douglass Land-grant Institute, West Virginia State University, Institute, WV, 25112-1000, USA

    Umesh K. Reddy & Padma Nimmakayala

  3. Boyce Thompson Institute for Plant Research, Tower Road, Ithaca, NY, 14853-1801, USA

    Zhangjun Fei

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  1. Amnon Levi
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Correspondence to Amnon Levi.

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Levi, A., Thies, J.A., Wechter, W.P. et al. High frequency oligonucleotides: targeting active gene (HFO-TAG) markers revealed wide genetic diversity among Citrullus spp. accessions useful for enhancing disease or pest resistance in watermelon cultivars. Genet Resour Crop Evol 60, 427–440 (2013). https://doi.org/10.1007/s10722-012-9845-3

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