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Unidirectional hybridization in heterostylous primroses

Unidirectional hybridization in heterostylous primroses
Unidirectional hybridization in heterostylous primroses

Heteromorphy in flowers has a profound effect on breeding patterns within a species, but little is known about how it affects reproductive barriers between species. Ma et al.  study a natural hybrid zone between two heterostylous primrose species, Primula beesiana and P. bulleyana, and find that all hybrid derivatives examined are backcrosses of first or later generations to P. bulleyana, and have the cpDNA of that species.Viable F1s can not be produced with P. bulleyana pollen on P. beesiana mothers. They conclude that partial ecological isolation, inhibition of heterospecific pollen and possibly complete barriers to F1 formation on P. beesiana may be enough to make F1 formation very rare in these species. The hybrid zone may thus have a finite lifespan as successive generations become more similar to P. bulleyana.

Written by Annals of Botany Office

The Annals of Botany Office is based at the University of Oxford.

Paleopolyploidy in the flax genus, Linum

Polyploidy and the evolution of flax

Maintenance of species cohesion despite ongoing hybridization

Maintenance of plant species cohesion despite ongoing hybridization