Tetraploid races of Paspalum notatum show polysomic inheritance and preferential chromosome pairing around the apospory-controlling locus

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-aposporo...

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Bibliographic Details
Published in:Theoretical and applied genetics 2004-06, Vol.109 (1), p.186-191
Main Authors: Stein, J, Quarin, C.L, Martinez, E.J, Pessino, S.C, Ortiz, J.P.A
Format: Article
Language:English
Subjects:
Alleles
amplified fragment length polymorphism
apomixis
Biological and medical sciences
Chromosome Mapping
chromosome pairing
Chromosome Pairing - genetics
chromosome segregation
Chromosome Segregation - genetics
chromosome transmission
Classical genetics, quantitative genetics, hybrids
Crosses, Genetic
cytogenetics
forage grasses
Fundamental and applied biological sciences. Psychology
gene segregation
Genetic Markers
Genetics
Genetics of eukaryotes. Biological and molecular evolution
inheritance (genetics)
Inheritance Patterns - genetics
linkage groups
loci
meiosis
Meiosis - genetics
Paspalum - genetics
Paspalum notatum
Ploidies
Pollen - genetics
Pteridophyta, spermatophyta
races
Random Amplified Polymorphic DNA Technique
Reproduction - genetics
tetraploidy
Vegetals
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Summary: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.
ISSN:0040-5752
1432-2242
DOI:10.1007/s00122-004-1614-z