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Cucurbit Genetics Cooperative Report 5:59-60 (article 28) 1982

Rectification of the Names of Certain Accessions of the IVT-Cucumis Collection

H.Q. Varekamp, D.L. Visser and A.P.M. den Nijs

Institute for Horticultural Plant Breeding (IVT), P.O. Box 16, Wageningen, The Netherlands

During last summer we were fortunate enough to have the assistance of the Royal Botanic Gardens at Kew to check the taxonomic determinations of our Cucumis species collection. We found this necessary because doubts existed about the correct name for certain accessions used in breeding experiments. It concerns our conception of C. africanus L.f., which has led to confusion with certain forms of C. zeyheri Sond., owing to the variable fruit indumentum of the latter. Accession numbers that were determined by us as C. africanus invariably appeared to be the diploid form of C. zeyheri. All the other accessions of our collection that had in the past been determined as C. zeyheri, were found to be tetraploid forms of this species. It has, therefore, been necessary to rename all the former C. africanus accessions as C. zeyheri Sond. 2X (2n = 24), while the tetraploidC. zeyheri accessions will be designated as C. zeyheri Sond. 4X (2n - 48). These two levels of ploidy were also distinguished by Dane, et. al. (1). The two forms show consistent morphological differences in the size and the indumentum of the fruits. The corrections for the accessions involved are given in Table 1. It follows that it will be necessary to change in previous reports of the IVT-Cucumis working group the name C. africanus L.f. into C. zeyheri Sond. These reports are listed in Table 2.

Meanwhile, further studies of our collection have turned up at least three accessions that correspond in the morphology of their fruits with the holotype of C. africanus L.f. cited by Jeffrey (3), which was examined in the Paris herbarium and also with specimens of this species in the Kew Herbarium that were annotated by Jeffrey. Unfortunately, we have been unable to procure seeds of PI 282 440, the C. africanus for which Deakin, et. al. (2), gave a description and a figure of the fruit.

We are indebted to the Royal Botanic Gardens at Kew for the loan of reference material of Cucumis specimens and to C. Jeffrey for generously putting his profound knowledge of the genus at our disposal.

Table 1. Accessions of C. zeyheri Sond. in the IVT Cucumis Species Collection

IVT Genebank nr.

Chrom. nr.

Origin

0162

24

Glasshouse Crops Research Institute, LIttlehampton, U.K.

0181

24

H.B.z, Montpellier or Nancy, France

0330

24

H.B., Coimbra, Portugal

1750

24

ZGK, Gatersleben, D.D.R.

1773

24

H.B., Izmir, Turkey

1780

24

H.B., Basel, Switzerland

1785

24

PI 203 974

1786

24

PI 274 036

1787

24

PI 299 569

1835

24

H.B., Salisbury, Zimbabwe

1969

24

H.B., Izmir, Turkey.

2064

24

H.B., Salisbury, Zimbabwe

2065

24

Vavilov Institute, Leningrad, U.S.S.R.

2074

24

Vavilov Institute, Leningrad, U.S.S.R.

2148

24

H.B., Kosice, U.S.S.R.

1053

48

PI 299 572

1807

48

PI 299 570

1809

48

PI 409 732

zH.B. - Hortus Botanicas

Table 2. List of reports with accessions of C. africanus L.f. which must be considered C. zeyheri Sond. 2x.

Reference citation

Custers, J.B.M. 1980. Proc. Eucarpia Meeting, Wageningen 50-55.

Custers, J.B.M. 1981. Cucurbit Genetics Coop. Rpt. 4:48-49.

Custers, J.B.M. and G. J. van Ee. 1981. Cucurbit Genetics Coop. Rpt. 3:50-51

Custers, J.B.M., A.P.M. den Nijs and A.W. Riepma. 1981. Cucurbit Genetics Coop. Rpt. 4:50-53.

Kho, Y.O., A.P.M. den Nijs and J. Franken. 1980. Cucurbit Genetics Coop. Rpt. 3:52-54.

Kho, Y.O., A.P.M. den Nijs and J. Franken. 1980. Euphytica 29:661-672.

Leeuwen, L. van and A.P.M. den Nijs. 1980. Cucurbit Genetics Coop. Rpt. 3:55-59.

Nijs, A.P.M. den, J.B.M. Custers and A.J. Kooistra. 1980. Cucurbit Genetics Coop. Rpt. 3:60-62.

Nijs, A.P.M. den and E. Oost. 1980. Euphytica 29:267-271.

Nijs, A.P.M. den, D.L. Visser and J.B.M. Custers. 1981. Cucurbit Genetics Coop. Rpt. 4:58-60.

Oost, E. and A.P.M. den Nijs. 1979. Cucurbit Genetics Coop Rpt. 2:43-44.

Visser, D.L., L. van Leeuwen and Y.O. Kho. 1980. Proc. Eucarpia Meeting, Wageningen : 44-49

Visser, D.L. and A.P.M. den Nijs. 1980. Cucurbit Genetics Coop. Rpt. 3:68-74.

Literature Cited

  1. Dane, F., D.W. Denna and T. Tsiuchiya. 1980. Evolutionary studies of wild species in the genus Cucumis. Zeitchr. Pfl. Zucht. Journ. Pl.
  2. Deakin, J.R., G.W. Bohn and T.W. Whitaker. 1971. Interspecific hybridization in Cucumis. Econ. Bot. 25:195-211.
  3. Jeffrey, C. 1962. Notes on Cucurbitaceae, including a proposed new classification of the family. Key Bull. 15:337-371.
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