Meiotic analyses ofCucumis hybrids and an evolutionary evaluation of the genusCucumis (Cucurbitaceae) |
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| Authors: | L W D van Raamsdonk A P M den Nijs M C Jongerius |
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| Institution: | (1) Institute for Horticultural Plant Breeding, P.O. Box 16, NL-6700 AA Wageningen, the Netherlands;(2) Present address: Foundation for Agricultural Plant Breeding, P.O. Box 117, NL-6700AC Wageningen, The Netherlands |
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| Abstract: | Meiosis in seven interspecificCucumis hybrids has been analysed i.a. inC. metuliferus ×C. zeyheri, where the parents belong to different sections. In the triploid hybrids a remarkably high number of trivalents has been found. Additional data from literature on geographical distribution, cucurbitacins, flavonoid patterns, isozymes, C-banding, genome size, DNA amount and chloroplast DNA are used to discuss species relationships and evolution. The African cross-compatible group is divided into theMyriocarpus subgroup with the diploid speciesC. africanus, C. myriocarpus subsp.leptodermis and subsp.myriocarpus, and theAnguria subgroup withC. anguria, C. dipsaceus, C. ficifolius, C. prophetarum, C. zeyheri and all polyploids (exceptC. heptadactylus). It is argued that the Asian subg.Melo with x = 7 is derived from the African subg.Cucumis with x = 12; the latter contains all the polyploid species and has the most common basic chromosome number of theCucurbitaceae. This phylogenetic advance is interpreted with concepts of the quantum model of evolution. |
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| Keywords: | Angiosperms Cucurbitaceae Cucumis C sativus C melo C metuliferus C anguria C zeyheri C myriocarpus subsp leptodermis comb nov Crossing experiments meiosis of hybrids polyploidy isozymes DNA analysis evolution |
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