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  • Author or Editor: G.L. Jelenkovic x
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Abstract

Reciprocal crosses among the nontuberous Solanum species S. gilo Raddi, S. integrifolium Poir, and S. nodiflorum Jacq. were performed under controlled conditions. Meiotic chromosome pairing of the hybrids was regular, and no reductions in chiasma frequency at diakinesis were observed. Normal disjunction in first and second meiotic divisions of fertile hybrids indicates that there is no conspicuous genomic differentiation at the chromosomal level. The gametic chromosome number was found to be n = 12 for all species and interspecific hybrids. BC1 and F2 populations consisting of fully fertile, partially fertile, and completely sterile seedlings were obtained. The fertile hybrid derivatives in these progenies may be of practical value in genetic improvement of the cultivated eggplant. Data for 3 phenotypic traits in selected F2 and BC1 populations indicate normal allelic segregation, and also indicated homology among the genomes of these species. Only in 2 cases were small deviations from expected ratios observed.

Open Access

Abstract

Reciprocal crosses of 7 selected nontuberous Solanum species, each represented by a single genotype, were performed under greenhouse conditions to assess their levels of crossability. The degree of crossability among these species was determined by fruit set, seeds per fruit, seed germination, and degree of F1 fertility. As a result of crossing these species inter se, 3 categories were established: a) species reciprocally crossable and capable of producing fully fertile F1 plants (S. gilo Raddi × S. integrifolium Poir.; S. gilo × S. nodiflorum Jacq.; S. nodiflorum × S. integrifolium); b) species unilaterally crossable (S. indicum L. × S. incanum L.; S. gilo × S. incanum; S. macrocarpon L. × 21–73); and c) species reciprocally noncrossable (S. gilo × S. indicum). Several genotypes of eggplant (S. melongena L.) were assessed for their crossability with wild species to investigate the possibility of gene transfer to improve commercial cultivars.

Open Access