Effects of distance and pollen competition on gene flow in the wind-pollinated grass Festuca pratensis Huds

Article Abstract:

Distance and pollen competition and their effects on gene flow in the wind-pollinated meadow grass Festuca pratensis Huds. are discussed. Gene flow was seen to be affected mainly by the distance between the donor and acceptor plants and to decrease rapidly with distance to the donor field up to 75 m. Beyond that distance, gene flow is much slower.

Physiological aspects, Dispersal (Ecology), Grasses, Pollen

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Spatial and temporal genetic structure in chloroplast and allozyme markers in Phacelia dubia implicate genetic drift

Article Abstract:

Genetic drift seems to be the main force behind chloroplast gene frequencies for the annual plant Phacelia dubia. For this plant an intrapopulation polymorphism in chloroplast DNA was used to look at relative temporal and spatial population structure of allozyme and chloroplast markers. Habitat destruction promoted isolation and enhanced differentiation. Mowing increased seed dispersal and cut differentiation for chloroplast markers. Significant differentiation was found among populations at chloroplast markers but not for allozyme loci. Fine-scale analysis showed significant structure among sites within populations for chloroplast markers and local heterozygote deficiencies at allozyme loci.

United States, Chloroplasts, Plant population genetics, Extrachromosomal DNA

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A polymorphic duplicated locus for cytosolic PGI segregating in sheep's fescue (Festuca ovina L.)

Article Abstract:

This article discusses the molecular and chromosomal process important for creation of polymorphic duplication found in sheep's fescue, Festuca ovina. An occasional extra locus encoding cytosolic phosphoglucoisomerase in this species and the genetic interpretation of the results are presented.

Plants, Plants (Organisms)

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