consequence of the more distant relatedness of the chromosome
of each donor parent, and potentially resulting in
amphidiploid-like behavior if used as a breeding parent.
The authors predicted somatic hybrid breeding behavior to
be intermediate between auto- and allo-tetraploids. Stift
et al. (2008) in fact have demonstrated through study of
segregation at SSR loci in natural autotetraploids of yellow
cress (Rorippa amphibia and R. sylvestris) that they
behaved as amphidiploids, that is, they display disomic
inheritance. However, when segregation patterns from an
F1 hybrid (the equivalent of a citrus somatic, allotetraploid
hybrid) were studied, it was found that inheritance indeed
fit an intermediate model, between disomic and tetrasomic
inheritance. The modes of inheritance were inconsistent
among individuals for a common locus, and likewise
inconsistent within individuals at different loci. Clearly,
such unpredictability will make linkage mapping and
genetic studies of inheritance from citrus somatic hybrids
difficult to study. The relatedness of the donors and their
chromosomes is a factor that will influence the degree of
recombination that might occur, and this in turn will affect
the genotypes and phenotypes of the triploid hybrid
offspring.
consequence of the more distant relatedness of the chromosome
of each donor parent, and potentially resulting in
amphidiploid-like behavior if used as a breeding parent.
The authors predicted somatic hybrid breeding behavior to
be intermediate between auto- and allo-tetraploids. Stift
et al. (2008) in fact have demonstrated through study of
segregation at SSR loci in natural autotetraploids of yellow
cress (Rorippa amphibia and R. sylvestris) that they
behaved as amphidiploids, that is, they display disomic
inheritance. However, when segregation patterns from an
F1 hybrid (the equivalent of a citrus somatic, allotetraploid
hybrid) were studied, it was found that inheritance indeed
fit an intermediate model, between disomic and tetrasomic
inheritance. The modes of inheritance were inconsistent
among individuals for a common locus, and likewise
inconsistent within individuals at different loci. Clearly,
such unpredictability will make linkage mapping and
genetic studies of inheritance from citrus somatic hybrids
difficult to study. The relatedness of the donors and their
chromosomes is a factor that will influence the degree of
recombination that might occur, and this in turn will affect
the genotypes and phenotypes of the triploid hybrid
offspring.
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