Sexual Plant Reproduction

, Volume 13, Issue 5, pp 243–249

A rise of ploidy level induces the expression of apomixis in Paspalum notatum

  • C. L. Quarin
  • Francisco Espinoza
  • Eric J. Martinez
  • Silvina C. Pessino
  • Oscar A. Bovo
Original Article

DOI: 10.1007/s004970100070

Cite this article as:
Quarin, C., Espinoza, F., Martinez, E. et al. Sex Plant Reprod (2001) 13: 243. doi:10.1007/s004970100070

Abstract 

The common races of bahiagrass, Paspalum notatum, are tetraploid (2n=4x=40) and reproduce by aposporous apomixis. Paspalum notatum var. saurae is the corresponding diploid (2n=2x=20) sexual race that outbreeds due to self-incompatibility. Chromosome doubling was induced by colchicine treatments in three individual plants from a natural diploid population. Embryological studies demonstrated that one of the induced autotetraploid plants reproduced sexually. The other two autotetraploids were facultative apomicts. These results indicate that an unexpressed gene(s) for apomixis exists at the diploid level. The expression of the trait is ploidy-dependent. The ploidy dependency may act either on the locus controlling apomixis through some transcription factors or via a secondary locus which requires a higher allele dosage to affect the expression of the main locus.

Keywords ApomixisColchicinePaspalum notatumChromosome doublingPolyploidy

Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • C. L. Quarin
    • 1
  • Francisco Espinoza
    • 1
  • Eric J. Martinez
    • 1
  • Silvina C. Pessino
    • 2
  • Oscar A. Bovo
    • 1
  1. 1.Instituto de Botánica del Nordeste, Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Agrarias, Universidad Nacional del Nordeste, Casilla de Correo 209, 3400 Corrientes, Argentina e-mail: camilo@compunort.com.ar Fax: +54-3783-427131AR
  2. 2.Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, 2000 Rosario, ArgentinaAR