IBONE 05434
INSTITUTO DE BOTANICA DEL NORDESTE
Unidad Ejecutora - UE
artículos
Título:
Evolutionary relationships between the diploid Turnera grandiflora and the octoploid T. fernandezii (Turneraceae)
Autor/es:
FERNANDEZ, A.; REY, HY; SOLIS NEFFA, VG
Revista:
ANNALES BOTANICI FENNICI
Editorial:
FINNISH ZOOLOGICAL BOTANICAL PUBLISHING BOARD
Referencias:
Lugar: Helsinki; Año: 2010 p. 321 - 329
ISSN:
0003-3847
Resumen:
Aiming to analyze the evolutionary relationships between the diploid species Turnera grandiflora (2n = 2x = 10) and the octoploid T. fernandezii (2n = 8x = 40), interspecific hybrids were recovered by invitro embryo rescue methods. The full-grown plants obtained were all pentaploids (2n = 5x = 25) confirming their hybrid nature. The chromosome associations observed in the hybrids during meiosis were indicative for an autopentaploid, suggesting that T. fernandezii carries the genome of T. grandiflora (CgCg) but at the octoploid level (CgCg CgC g CgCg CgCg). This fact confirms a close evolutionary relationship between the species and supports the hypothesis that T. grandiflora is the progenitor of T. fernandezii. A tentative hypothesis regarding the autopolyploid origin of T. fernandezii is finally formulated.
