Breeding systems and hybridization in Petrorhagia sect. Kohlrauschia ( Caryophyllaceae) Article Received: 12 December 1980 DOI:
Cite this article as: Thomas, S.M. & Murray, B.G. Pl Syst Evol (1981) 139: 77. doi:10.1007/BF00983923 Abstract
In the diploid species
P. prolifera, the evolution of autogamy has resulted in the presence of distinct selfing and outcrossing races. The change in breeding system toward autogamy is associated with a reduction in the size of floral features and a lower pollen production. The outbreeding populations have only been found in Greece, while the selfing populations have colonized much of Europe. The two races appear to be reproductively isolated from one another. — Petrorhagia sect. Kohlrauschia contains four species. P. glumacea is outbreeding and shows unilateral incompatibility with the small-flowered race of P. prolifera and interfertility with the large-flowered race; although P. glumacea is sympatric with the large-flowered race, they do not appear to hybridize in the wild. Amongst the allopatric species, internal breeding barriers are also found. These may take the form of hybrid sterility or seed incompatibility. P. velutina is autogamous and reproductively isolated from all the other species of the section regardless of whether they are sympatric or allopatric. It is suggested that the evolution of autogamy has been an important factor in the spread of P. velutina, the tetraploid P. nanteuilii, and the small-flowered race of P. prolifera in Europe. Key words Caryophyllaceae Petrorhagia prolifera P. velutina P. glumacea P. nantueuilii Floral morphology breeding systems hybridization reproductive isolation References
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