Sven E. Asker

Publications37
h-index10
Citations795
Highly Influential Citations81
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Apomixis in Plants
INTRODUCTION. References. APOMIXIS AND PARTHENOGENESIS-A HISTORICAL REVIEW. THE EMPIRICAL BACKGROUND. Early Observations. Mendel on Apomixis. Pioneer Work. Biosystematic and Biogeographic… Expand
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Pseudogamy, hybridization and evolution in Potentilla
Related apomicts often coexist within a biotope. Where they intercross, occasional hybrids may be formed. The designations U- and R-hybrids - from fertilized unreduced and reduced egg cells,… Expand
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Gametophytic apomixis: elements and genetic regulation.
Gametophytic apomixis implies formation of unreduced embryo-sacs and capacity of their egg cells for parthenogenetic development. Each of these processes, as well as their union to give matromorphous… Expand
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Progress in apomixis research
Apomixis in the angiosperms comprises different kinds of asexual reproduction, wholly or partly replacing the sexual cycle. Recent views on evolutionary advantages and drawbacks of apomixis are… Expand
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The “Potentilla collina problem”— a chemotaxonomic approach
The Potentilla collina complex is intermediate between P. argentea and P. tabernaemontani and is thought to have arisen through hybridization between these or closely related species. As most taxa… Expand
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Some viewpoints on Fragaria x Potentilla intergeneric hybridization
Hybrids of varying degrees of vitality are produced in several crossing combinations between Fragaria and Potentilla species. Hitherto, mature hybrids have been obtained only with polyploid Fragaria… Expand
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Apomictic biotypes in Potentilla intermedia and P. norvegica
Material from localities in N. Scania, Sweden, was used in the present investigation. The chromosome number was 2n=56 in P. intermedia (as previously counted in Polish material) and 2n=70 in P.… Expand
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Apomixis and sexuality in the Potentilla argentea complex I. Crosses with other species
In crossing experiments plants from two different taxa in the Potentilla argentea group were used as pistillate parents. At first, a tetraploid aposporous biotype was used that was known to produce… Expand
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Polymorphism of Potentilla tabernaemontani and related taxa on Gotland
Potentilla tabernaemontani and P. cinerea are widely distributed in Europe and are linked together by hybrids. Sexual tetraploids occur, especially of P. cinerea in SE Europe. Biotypes from N Europe… Expand
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Chromosome studies in Potentilla
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