Recent Topics Posters
Oyelana, Olatunji .
Correlated evolutionary pattern of inflorescence,leaf morphology and species genome in three sub-genera of the genus Solanum L(Solanaceae) in Nigeria.
The phylogenetic relationship among the diversegroups and members of the genus Solanum has remained unresolved due to species - large size, similar morphology and a constantly expanding genome through theinclusion of foreign genes as evident in the naturally occurring hybrids. Thedearth of information about species relationship has hampered speciesimprovement through germplasm typing essential for biotechnological manipulation.The representative species in Nigeria were assessed on the basis ofmorphological characterization, cytological expression and crossing experimentsto ascertain extent of species relationship and divergence. The diploid (2n =24) races included the two varieties of S.melongena, S. gilo, S. aethiopicum,S. torvum, S. macrocarpon, S. anguivi and S. erianthumwhile the two subsp of S. scabrum revealed a tetraploid (2n = 48)condition. The species were tree-like (S.erianthum), small tree (S. torvum)or shrubs with herbaceous stems (S. aethiopicum) or woody with and/orwithout spines (S. anguivi), with inflorescence eitherracemose (S. melongena) or umbellate (S.macrocarpon). The depth of leaf lobewas reduced to serration (S. scabrum subsp erectum) or entire in S. scabrum subsp scabrum. The F1 hybrids were intermediate in height and dimensions formost morphological features, diploids (2n = 24) and readily adapted to localsoil conditions. A triploid hybrid (2n = 72) was seedless and deviated significantlyin morphology and growth habit. A hybrid had profuse foliage but did not flowerthroughout the duration of studies. Past inter-generic hybridization was linkedto origin of species within the genus, and the pattern of evolution and speciesstatus followed through seven (7) levels or accessions, a process predicatedupon genomic changes as revealed in meiotic irregularities, doubling ofchromosome number and reduction in both the axes of inflorescence and depth ofleaf margin. The choice of species within the genus for the purpose ofhybridization is now largely reinforced by stable genome and regular meiosis. Keywords: Solanum, chromosomes, meiosis, genome,hybridization, phylogeny.
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1 - Redeemer's University, Biological Sciences, Km 46 Lagos-Ibadan Expressway, Redemption City, Mowe, Ogun, 100010, Nigeria
Presentation Type: Recent Topics Poster
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM