INVESTIGADORES
SEIJO Jose Guillermo
artículos
Título:
Análisis de la producción y frecuencia de microsporas no reducidas en diploides de Turnera sidoides (Turneraceae).
Autor/es:
PANSERI, A.; SEIJO, JG; SOLÍS NEFFA, VG
Revista:
BOLETÃN DE LA SOCIEDAD ARGENTINA DE BOTáNICA
Editorial:
Sociedad Argentina de Botánica
Referencias:
Lugar: Córdoba; Año: 2008 vol. 43 p. 95 - 101
ISSN:
0373-580X
Resumen:
Summary: Analysis of the production and frequency of unreduced microspores in diploids of Turnera
sidoides (Turneraceae). Turnera sidoides is a polyploid complex (x= 7) of dystilous perennial rhizomatous
herbs that includes five subspecies. Owing to the high frequency of polyploids within the complex,
ongoing studies in T. sidoides are focused on the understanding of the mechanisms involved in the origin
and the establishment of polyploids in order to provide evidences of the evolutionary patterns in T.
sidoides. In this report we investigate the occurrence and frequency of unreduced microspores in
diploid plants from nine natural populations of four subspecies of T. sidoides by analyzing the range of
variation of pollen volume and the constitution of the sporads. The results obtained showed that almost
all the populations studied produced 2x and 4x microspores, both in short and long-styled floral morphs.
Furthermore, the analysis performed provided evidences that support the hypothesis of sexual
polyploidization as one of the mechanisms involved in the origin of polyploids within this species complex.
The role of unreduced pollen in the establishment and persistence of newly formed polyploids within
diploid populations of T. sidoides is also discussed.