| Abstract Detail
Recent Topics Posters Oyelana, Olatunji [1], Ugborogho, Reginald E. [2]. Phenotypic variations of F1 and F2 populations from three species of Solanum L. (Solanaceae). The emerging chromosome types in some Solanum species underscore inherent potentials and possible new and expanded genome. Interspecific crosses involving the varieties of S. melongena, S. macrocarpon and S. aethiopicum were carried out to assess species phylogenetic relationships and the extent of evolutionary changes with a view to improving the agronomic characters in the hybrids. The dimensions of leaves, petals and fruits in the F1 hybrids were intermediate in values to either parent while parental influence was significant in such characters as growth habit, inflorescence types and colour of flowers. Pollen viability was depressed, ranging from 48.8 % to 56.8 % in the F1 and consistently lowered (< 48 %) in many of the F2 hybrids but restored (63.8 %) in an F2 plant. Fruits were few on inflorescence, small sized and set fewer seeds in the F1 (67-132) and F2 (12-89) hybrids compared with the parents. However, two F2 fruits attained the mean sizes of their grand parents. The single flowered inflorescence from a cross (S. melongena var. bomo x S. aethiopicum) revealed a novel gene and possible ecological advantage over other hybrid populations. The incomplete restoration of some of the masked features in the F2 hybrids suggests a near-complete homogenization of parental genomes and/or chromosomal disharmony through silent genomic changes. These may have prevented sufficient chromosomal rearrangement and full homology for improved vigour in many of the F2 hybrids.
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1 - Babcock University, Ilishan-Remo, Dept. of Basic & Applied Sciences, PMB 21244, Ikeja, Lagos, Lagos, 100-001, Nigeria
2 - University of Lagos, Department of Cell Biology & Genetics, Faculty of Science, Akoka, Lagos, Lagos state, Nigeria
Keywords:
Solanum
genome
evolution
interspecific hybridization
pollen viability
hybrid fertility.
Presentation Type: Recent Topics Poster
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P79032
Abstract ID:2674 |
