EVOLUTIONARY DYNAMICS OF AUTOPOLYPLOIDS IN NATURAL POPULATIONS: THE CASE OF TURNERA SIDOIDES COMPLEX

KOVALSKY, I. EVELIN; ELÍAS, GABRIELA DEL VALLE; FERNÁNDEZ S.A; MORENO E.M.S.1

Basic and Applied Genetics

SOCIEDAD ARGENTINA DE GENÉTICA

Lugar: Buenos Aires; Año: 2022

1666-0390

urnera sidoides (x=7) is one of the few well-studied South American autopolyploid complexes.Since polyploidy has played a prominent role within this complex, ongoing studies in T. sidoidesfocus on understanding the mechanisms involved in the origin and the establishment of polyploidsusing integrative approaches. This paper synthesises the results of more than 20 years of researchon this topic. Cytogenetics analysis provided evidences for the production of unreduced male andfemale gametes, supporting the hypothesis of bilateral sexual polyploidization as the mechanismof origin of polyploids in T. sidoides. The finding of viable triploids suggested that unilateralsexual polyploidization could also be an important mechanism for the origin of tetraploids in T.sidoides. The occurrence of plants continuously forming many unreduced gametes would play akey role in the establishment of neopolyploids in natural populations. Also, the higher numberof propagules that tetraploids contribute to sub