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Abstract Detail

Hybrids and Hybridization

Benmiloud-Mahieddine Radia, B.R [1], Kaid-Harche, Meriem [1], Darmency-Abirached, Mona [2].

Homoploid hybrid speciation in genus Retama (Fabaceae), karyological evidence.

Premise of the study: Ambiguous documentations of classification in the genus Retama species (Fabaceae) were reported by several botanists. Furthermore, hypothesis of a secondary polyploidy has been advanced in this genus with an unknown base chromosome number. By our recent molecular study (unpublished) we suggest that "homoploid hybrid" origin is plausible for one species in this group of taxa. For this reason a karyological analysis was needed to establish the chromosome number and karyotype structure of the putative hybrid. Methods: In this study a karyological description of Retama was established (2n = 48). Results: In Algerian populations from R. raetam and R. monosperma species, B-chromosomes were revealed by the first time. Their karyotype corresponds to 9 metacentric and 15 submetacentric chromosomes pairs for R. monosperma and 9 metacentric, 14 submetacentric chromosomes pairs, and one subtelocentric chromosome pair for R. raetam. One or two B-chromosomes were also observed in these species. Furthermore, the karyotype of the species R. sphaerocarpa from Saharan Atlas in Algeria was very different, showing 4 metacentric chromosomes pairs and 20 sub-metacentric and no B-chromosomes were observed. Conclusion: According to these results we suggest to consider the two species R. retaem and R. monosperma as potentials progenitors to the species R. spherocarpa which is a probably an interspecific hybrid "Homoploid Hybrid". The development of a new species with a modified karyotype, confirms the close evolutionary with its parents.

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1 - Université des Sciences et de la Technologie d’Oran Mohammed Boudiaf,, Department of Biotechnology, Faculty of Sciences, Laboratoire des Productions Valorisations Végétales et Microbiennes, Oran, 31000, Algeria
2 - INRA, 2 UMR102 Genetics and Ecophysiology of Grain Legumes, Dijon, France, F-21000


Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PHB002
Abstract ID:339
Candidate for Awards:Genetics Section Poster Award

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