Biosystematic Study of Solanum Macrocarpon - S. Dasyphyllum Complex in Uganda and Relations with Solanum Linnaeanum.

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Date
1994
Authors
Carascot J.F.
Bukenya Z.R.
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Abstract
In a study conducted in Uganda to examine the bio systematics of Solanum macrocarpon complex and its relations with S. linnaeanum complex, it was observed that tremendous morphological variation existed within S. macrocarpon complex. Morphological characters that are useful in the infra specific classification of S. macrocarpon L. complex and S. linnaeanum Hepper ex Jaeger, include leaf size, petiole length, leaf lobing, number of flowers per inflorescence, length of inflorescence axis, pedicel length, calyx length, size of flowers, fruit size nature of fruit stalk (erect/decurved), seed size and colour, hair types. From morphological and experimental methods, four groups of S. macrocarpon complex in Uganda were recognized. These include S. macrocarpon (semi-wild group), S. macrocarpon 'Mukono' cultivar and S. macrocarpon "Nabingo" cultivar. The cultivars have selection pressures, from the wild group through the semi-wild group through to the present cultivars. There is considerable variation within the two major cultivar groups especially the 'Mukono' group. For practical purposes, it is not advisable to split these up into smaller groups such as forms. Solanum linnaeanum is distinct from S. macrocarpon complex. The wild group of S. macrocarpon (S. dasyphyllum) and cultivars of S. macrocarpon belong to the same biological species. Solanum dasyphyllum should be formally sunk under S. macrocarpon and the infraspecific classification of S. macrocarpon complex to be sorted out.
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East African Agricultural And Forestry Journal, 59 (No. 3), p. 187-204