Genetic Resources and Crop Evolution

, Volume 47, Issue 4, pp 385–393 | Cite as

A phenetic analysis of morphological variation in Citrullus lanatus in Namibia

  • Gillian L. Maggs-Kölling
  • Sten Madsen
  • Jørgen L. Christiansen


Morphological data recorded from field trials using Citrullus lanatus germplasm collected in Namibia were used to analyse and compare the various morphotypes of this species. The experiment comprised wild types and local landraces as well as commercial cultivars. Cluster analysis supported the indigenous classification system used in Namibia, in which Citrullus types are distinguished based on gross morphology, ecology and usage and grouped into seed, cooking and fresh-eating (watermelon) types. Commercial watermelon cultivars formed a distinct cluster. Wide variation was found within the local types whereas the genetic basis of the commercial type appears to be narrow. The commercial cultivars were most closely related to local watermelon types and more distantly related to the wild types, whereas the cooking melons form an intermediate group.

Citrullus lanatus cluster analysis evolution morphology watermelon 


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  1. Anonymous, 1990. SAS/STAT User' Guide, Version 6, 3rd edition. SAS Institute Inc., Cary, NC.Google Scholar
  2. Arnold, T.H. & B.C. de Wet, 1993. Plants of southern Africa: Names and distribution. Mem. Bot. Surv. S. Afr. 62: 1–825.Google Scholar
  3. Bailey, L.H., 1930. Three discussions in Cucurbitaceae. Gentes Herb. 2: 175–186.Google Scholar
  4. Bates, D.M. & R.W. Robinson, 1995. Cucumbers, melons and watermelons. In: Smart, J. & N.W. Simmonds (Eds), Evolution of crop plants, 2nd edition, pp. 89–96. Longman, London.Google Scholar
  5. Chambliss, O.L., H.T. Erickson & C.M. Jones, 1968. Genetic control of bitterness in watermelon fruits. Proc. Am. Soc. Hort. Sci. 93: 539–546.Google Scholar
  6. DeWinter, B., 1990. A new species of Citrullus (Benincaseae) from the Namib Desert, Namibia. Bothalia 20: 209–211.Google Scholar
  7. Ellis, R.H., T.D. Hong & E.H. Roberts, 1985. Handbook of Seed Technology for Genebanks. Volume 1. Principles and Methodology. International Board for Plant Genetic Resources, Rome.Google Scholar
  8. Elmstrom, G.W., P.L. Davids & K.A. Munroe, 1980. Sugars in maturing fruit of watermelon cultivars. HortScience 15: 277 (abst.).Google Scholar
  9. Esquinas-Alcazar, J.T. & P.J. Gulick, 1983. Genetic resources of Cucurbitaceae – a global report. International Board for Plant Genetic Resources, Rome.Google Scholar
  10. Evans, L.T., 1993. Crop Evolution, Adaptation and Yield. Cambridge University Press, Cambridge.Google Scholar
  11. Fulks, B.K., J.C. Scheerens & W.P. Bemis, 1979. Natural hybridization of two Citrullus species. J. Hered. 70: 214–215.Google Scholar
  12. Fursa, T.B., 1972. K sistematike roda Citrullus Schrad. Bot. Zhurn. 57(1): 31–41.Google Scholar
  13. Gower, J.C., 1985. Measures of taxonomic distance and their analysis. In: Kotz, S. & N.L. Johnson (Eds), Encyclopedia Statistical Sciences 5: 395–405. Wiley, New York, NY.Google Scholar
  14. Jarret, R.L., L.C. Merrick, T. Holms, J. Evans & M.K. Aradhya, 1997. Simple sequence repeats in watermelon (Citrullus lanatus (Thunb.) Matsum. & Nakai). Genome 40: 433–441.Google Scholar
  15. Kirkbride, J.H. Jr., 1993. Biosystematic monograph of the genus Cucumis (Cucurbitaceae). Parkway Publishers, Boone.Google Scholar
  16. Lee, S.L., J.S. Shin, K.W. Park & Y.P. Hong, 1996. Detection of genetic diversity using RAPD-PCR and sugar analysis in watermelon (Citrullus lanantus [lanatus] (Thunb.) Mansf.) germplasm. Theor. Appl. Genet. 92: 719–725.Google Scholar
  17. Leistner, O.A. & J.W. Morris, 1976. Southern African place names. Ann. Cape Prov. Mus. 12: 1–565.Google Scholar
  18. Maggs, G.L., 1998. Genetic resources and agricultural potential of indigenous Cucurbitaceae in Namibia. Ph.D. thesis. Royal Veterinary and Agricultural University, Copenhagen, Denmark.Google Scholar
  19. Mallick, M.F.R. & M. Masui, 1986. Origin, distribution and taxonomy of melons. Scientia Hortic. 28: 251–261.Google Scholar
  20. Meeuse, A.D.J., 1962. The Cucurbitaceae of southern Africa. Bothalia 8: 1–111.Google Scholar
  21. Navot, N. & D. Zamir, 1987. Isozyme and seed protein phylogeny of the genus Citrullus (Cucurbitaceae) Pl. Syst. Evol. 156: 61–67.Google Scholar
  22. Ortiz, R., 1997. Morphological variation in Musa germplasm. Genet. Resour. Crop Evol. 44: 393–404.Google Scholar
  23. Ortiz, R., S. Madsen & D. Vuylsteke, 1998. Classification of African plantain landraces and banana cultivars using phenotypic distance index of quantitative descriptors. Theor. Appl. Genet. 96: 904–911.Google Scholar
  24. Rhodes, B. & X. Zhang, 1995. Gene list for watermelon. Cucurbit Genetics Cooperative Rept. 18: 69–84.Google Scholar
  25. RHS, 1995. RHS Colour Chart. Royal Horticultural Society, London.Google Scholar
  26. Robinson, R.W. & D.S. Decker-Walters, 1997. Cucurbits. CAB International, Wallingford.Google Scholar
  27. Singh, A.K., 1978. Cytogenetics of semi-arid plants III. A natural interspecific hybrid of Cucurbitaceae. (Citrullus colosynthis Schrad. × C. vulgaris Schrad.). Cytologia 43: 569–574.Google Scholar
  28. Sneath, P.H.A. & R.R. Sokal, 1973. Numerical taxonomy: The principles and practice of numerical classification. W.H. Freeman & Co., New York, NY.Google Scholar
  29. Taylor, F.W., 1985. The potential for the commercial utilization of indigenous plants in Botswana. In: Wickens, G.E., J.R. Goodin & D.V. Field (Eds.), Plants for Arid Lands. George Allen & Unwin, London.Google Scholar
  30. Valentine, D.H., 1975. The taxonomic treatment of polymorphic variation. Watsonia 10: 385–390.Google Scholar
  31. Van der Merwe, J.H., 1983. National Atlas of South West Africa (Namibia). National Books, Goodwood.Google Scholar
  32. Van Hintum, Th.J.L., 1995. Hierarchical approaches to the analysis of genetic diversity in crop plants. In: Hodgkin, T., A.H.D. Brown, Th.J.L. van Hintum & E.A.V. Morales (Eds.), Core collections of plant genetic resources, pp. 23–34. John Wiley and Sons, Chichester.Google Scholar
  33. Zeven, A.C. & J.M.J. de Wet, 1982. Dictionary of cultivated plants and their regions of diversity, 3rd edition. Centre for Agricultural Publishing and Documentation, Wageningen.Google Scholar
  34. Zohary, D. & M. Hopf, 1988. Domestication of plants in the Old World. Clarendon Press, Oxford.Google Scholar

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Gillian L. Maggs-Kölling
    • 1
    • 2
  • Sten Madsen
    • 2
  • Jørgen L. Christiansen
    • 2
  1. 1.Ministry of Agriculture, Water and Rural DevelopmentNational Botanical Research InstituteWindhoekNamibia
  2. 2.Department of Agricultural SciencesThe Royal Veterinary and Agricultural UniversityFrederiksberg CDenmark

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