First cytogenetic register of an allopolyploid lineage of the genus Aeschynomene (Leguminosae, Papilionoideae) native to Mexico

Authors

  • Fernando Tapia-Pastrana Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México, Laboratorio de Genecología, Batalla 5 de Mayo s/n esquina Fuerte de Loreto, Col. Ejército de Oriente, Iztapalapa, C.P. 09230, Ciudad de México, Mexico http://orcid.org/0000-0003-0232-2110
  • Alfonso Delgado-Salinas Instituto de Biología, Departamento de Botánica, Universidad Nacional Autónoma de México, Apartado Postal 70-233, 04510, Cd. de México, Mexico

DOI:

https://doi.org/10.13128/caryologia-949

Keywords:

cryptic taxa, cytotypekaryotype, nucleolar dominance, SAT-chromosomes, secondary constrictions, seedlings

Abstract

A conventional cytogenetics analysis revealed for first time an allopolyploid lineage of the genus Aeschynomene in Mexico. The hybrid condition is confirmed after all the prometaphase and metaphase nuclei of the hybrids exhibited only one pair of SAT-chromosomes, confirming the existence of nucleolar dominance and amphiplasty. The karyotype formula for this lineage was 2n = 4x = 40 = 34 m + 6 sm with a total diploid chromosome length (TDCL) = 28µm and an average chromosome size (AC) = 1.40 µm. Comparison of the karyotype and other chromosomal parameters with recent cytogenetics records for other species of the subgenus Aeschynomene included in the Nod-independent clade allows propose to Aeschynomene evenia and A. scabra as possible progenitors. Furthermore, other comparison of seedlings focused at the number of leaflets of the first four eophylls of the proposed parents and of the hybrid individuals allowed to observe coincidences that support the proposal made from the cytogenetic analysis. Evidence of “gigas” effects on flowers and fruits of hybrids is also shown.

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Published

2021-05-19

How to Cite

Tapia-Pastrana, F. ., & Delgado-Salinas, A. (2021). First cytogenetic register of an allopolyploid lineage of the genus Aeschynomene (Leguminosae, Papilionoideae) native to Mexico. Caryologia, 73(4), 17–26. https://doi.org/10.13128/caryologia-949

Issue

Vol. 73 No. 4 (2020)

Section

Articles

License

Copyright (c) 2020 Fernando Tapia-Pastrana, Alfonso Delgado-Salinas

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