Journal Article

Cytogenetic evidence of mixed disomic and polysomic inheritance in an allotetraploid (AABB) <i>Musa</i> genotype

Mouna Jeridi, Xavier Perrier, Marguerite Rodier-Goud, Ali Ferchichi, Angélique D'Hont and Frédéric Bakry

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 110, issue 8, pages 1593-1606
Published in print December 2012 | ISSN: 0305-7364
Published online October 2012 | e-ISSN: 1095-8290 | DOI: https://dx.doi.org/10.1093/aob/mcs220
Cytogenetic evidence of mixed disomic and polysomic inheritance in an allotetraploid (AABB) Musa genotype

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  • Ecology and Conservation
  • Evolutionary Biology
  • Plant Sciences and Forestry

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Background and Aims

Edible bananas originated mainly from two wild species, Musa acuminata Colla (AA) and Musa balbisiana Colla (BB), and triploid cultivars with an AAA, AAB or ABB genome are the most widely used. In the present study, chromosome pairing affinities are investigated in a sterile AB Indian variety and in its fertile colchicine-induced allotetraploid (AABB) derivative to determine the inheritance pattern of the tetraploid genotype. The potential implications of interspecific recombination and chromosomal composition of diploid gametes for Musa improvement are presented.

Methods

The pairing of different chromosome sets at diploid and tetraploid levels was investigated through a combination of conventional cytogenetic and genomic in-situ hybridization (GISH) analyses of meiotic chromosomes, leading to a likelihood model of the pairing behaviour. GISH analysis of mitotic chromosomes was also conducted to reveal the chromosome constitution of hybrids derived from crosses involving the allotetraploid genotype.

Key Results

Analysis of chromosome associations at both ploidy levels suggested that the newly formed allotetraploid behaves as a ‘segmental allotetraploid’ with three chromosome sets in a tetrasomic pattern, three sets in a likely disomic pattern and the five remaining sets in an intermediate pattern. Balanced and unbalanced diploid gametes were detected in progenies, with the chromosome constitution appearing to be more homogenous in pollen than in ovules.

Conclusions

Colchicine-induced allotetraploids in Musa provide access to the genetic background of natural AB varieties. The segmental inheritance pattern exhibited by the AABB allotetraploid genotype implies chromosome exchanges between M. acuminata and M. balbisiana species and opens new horizons for reciprocal transfer of valuable alleles.

Keywords: Musa; banana; polyploidy; homoeologous pairing; inheritance pattern; gamete selection; GISH

Journal Article.  8232 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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