Artículos de revistas
Tetraplioid races of Paspalum notatum show polysomic inheritance and preferential chromosome pairing around the apospory-controlling locus
Fecha
2004-02Registro en:
Stein, Juliana; Quarin, Camilo Luis; Martínez, Eric Javier; Pessino, Silvina Claudia; Ortiz, Juan Pablo Amelio; Tetraplioid races of Paspalum notatum show polysomic inheritance and preferential chromosome pairing around the apospory-controlling locus; Springer; Theoretical And Applied Genetics; 109; 1; 2-2004; 186-191
0040-5752
1432-2242
CONICET Digital
CONICET
Autor
Stein, Juliana
Quarin, Camilo Luis
Martínez, Eric Javier
Pessino, Silvina Claudia
Ortiz, Juan Pablo Amelio
Resumen
The objective of this work was to determine the type of inheritance (disomic/polysomic) in tetraploid (2n=4x=40) Paspalum notatum and investigate the transmission pattern of the chromosome region associated with apospory. An F1 family segregating for the reproductive mode (aposporous vs non-aposporous) was generated by crossing a tetraploid sexual plant as female parent with an apomictic individual as pollen donor. Pollen mother cells from both parental plants were examined to ascertain chromosome-pairing behavior at meiosis. The high rate of quadrivalent chromosome associations indicated an autotetraploid origin of the species, although bivalent pairing and occasional univalents were detected. The observation of a lagging bivalent, a bridge of chromatin, or two aligned laggards in the aposporous parent suggested a chromosome inversion in this strain. Segregation ratios of AFLP markers and the proportion of linkages in repulsion versus coupling phase denoted tetrasomic inheritance, but markers displaying disomic ratios were also observed. Preferential chromosome pairing (disomic inheritance) in the chromosome segment related to apospory was detected. The possible relationship between a chromosome rearrangement and the inheritance of apospory is discussed.