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Genotype manipulation through the introduction of novel genes for improved yield, agronomic qualities and a larger gene pool informed an experimental cross between diploid Solanum melongena 'Golden' (2n = 2x = 24) and tetraploid S. scabrum 'Scabrum' (2n = 4x = 48).The F 1fruit contained eight seeds which had a 100% germination and a chromosome number 2n = 6x = 72. Surviving hybrids were closer to the diploid parent in many characters. Leaves were fairly lobed, sparsely hairy and were13.5x8.6cminthehybridcomparedtothehairy,deeplylobed,14.8x10.6cmleavesinthediploidandglabrous,entire and 11.4 x 10.6 cm leaves in the tetraploid parent.The inflorescence in the hybrid was a raceme as in the diploid parent but wasumbellateinthetetraploid.Pollenviabilitywas38.2%inthehybridbutwas71%and97.4%inthediploidandtetraploid parents, respectively. Fruit was seedless in the F 2; it was round and red, containing 384 seeds, globose-shaped, yellow seeds in the diploid, and 67, round, purple seeds in the tetraploid parent. Meiosis was regular in the hybrid with few univalents and impairedbivalentsduetodissimilarparentalgenomes.Mitoticchromosomeswereasymmetricalwithvarioussizes.Epistasis and negative gene interaction mechanisms were implicated in the hybrids' low quality and breakdown. Backcross to the tetraploid parent may bring about gene recombination and allelic realignment for desirable phenotypes in the F 2 and subse - quent generations. Endoduplication of the triploid zygote might have produced an autoallohexaploid hybrid. Additional key words: autopolyploidization, endoduplication, fruit set, hybrid breakdown, interspecific hybridization. Resumen

Cytomorphological analysis of a novel hybrid from Solanum melongena 'Golden' x S. scabrum 'Scabrum' (Solanaceae)