TY - JOUR AU - Tapia-Pastrana, Fernando AU - Delgado-Salinas, Alfonso PY - 2021/05/19 Y2 - 2024/03/28 TI - First cytogenetic register of an allopolyploid lineage of the genus Aeschynomene (Leguminosae, Papilionoideae) native to Mexico JF - Caryologia JA - Caryologia VL - 73 IS - 4 SE - Articles DO - 10.13128/caryologia-949 UR - https://riviste.fupress.net/index.php/caryologia/article/view/949 SP - 17-26 AB - <p class="p1">A conventional cytogenetics analysis revealed for first time an allopolyploid lineage of the genus <span class="s1">Aeschynomene</span> 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 2<span class="s1">n</span> = 4<span class="s1">x</span> = 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 <span class="s1">Aeschynomene</span> included in the Nod-independent clade allows propose to <span class="s1">Aeschynomene evenia</span> and <span class="s1">A. scabra</span> 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.</p> ER -