Abstract
Most Lotus species have the basic chromosome number x = 7. The basic number x = 6 is, however, characteristic for the Corniculatus group and the other species from the section Lotus. Polyploidy, especially tetraploidy (2n = 4x), is recurrent in the genus with many species showing diploid and tetraploid accessions and others known as tetraploids only, such as L. corniculatus, the major forage crop. Genomes are relatively small, which, together with other interesting features, led to the choice of L. japonicus as a model legume species. Since then, advances in molecular cytogenetics, with the mapping of repetitive and single-copy sequences, enabled the integration of chromosomes to genetic maps and genome sequence information. Comparative cytogenetic maps were established for species from the section Lotus, mostly from the Corniculatus groups, and have demonstrated the importance of inversions and translocations, in addition to descending dysploidy and polyploidy, to the karyotype evolution of the genus.
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Acknowledgments
We thank Federico Condón (Instituto Nacional de Investigación Agropecuária – INIA, Uruguay), Miguel Dall’Agnol (Universidade Federal do Rio Grande do Sul, Brazil), Niels Sandal (Aarhus University, Denmark) and Shusei Sato (Kazusa DNA Research Institute, Japan) for seeds and probes and Sandra Mendes (Universidade Federal de Pernambuco, Brazil) for drawing the original Fig. 2.3. Andrea Pedrosa-Harand thanks the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Brazil, for financial support.
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Ferreira, J., Pedrosa-Harand, A. (2014). Lotus Cytogenetics. In: Tabata, S., Stougaard, J. (eds) The Lotus japonicus Genome. Compendium of Plant Genomes. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44270-8_2
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