Single-locus inheritance in the allotetraploid Coffea arabica L. and interspecific hybrid C. arabica X C. canephora
Molecular cytogenetic analysis has indicated that Coffea arabica is an amphidiploid formed from the hybridization between two closely related diploid progenitor species, C. canephora and C. eugenioides. This study was conducted to determine the modeof inheritance in C. arabica and in a tetraploid interspecific hybrid (arabusta) between C. arabica and C. canephora, as revealed by segregation analyses of restriction fragment length polymorphism (RFLP) loci markers. The observed RFLP allele segregations in an F2 progeny of C. arabica conformed to disomic inheritance as expected, with regular bivalent pairing of homologous chromosomes in the F1 hybrid. In contrast, RFLP loci followed tetrasomic inheritance in the arabusta interspecific hybrid, althoughbivalents have been reported to predominate greatly at meiosis in its hybrid. These results suggest that homologous chromosomes do not pair in C. arabica, not as a consequence of structural differentiation, but because of the functioning of pairing regulating factors. Moreover, the arabusta hybrid seems to offer the possibility of gene exchange between the homologous genomes.
| Main Authors: | , , , , , |
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| Format: | biblioteca |
| Published: |
2000
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| Subjects: | COFFEA ARABICA, COFFEA CANEPHORA, COFFEA, HERENCIA (ECONOMIA), HIBRIDACION INTERESPECIFICA, APAREAMIENTO CROMOSOMICO, MEIOSIS, RFLP, MARCADORES GENETICOS, HIBRIDOS, PLANTAS ESTIMULANTES, BIOTECNOLOGIA, |
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