Major gene effects during weed evolution: phenotypic characters cosegregate with alleles at the Ray Floret Locus in Senecio vulgaris L. (Asteraceae)

Article Abstract:

A codominant marker using ray floret length was investigated to test for associations with phenotypic characters in two F2 progenies derived from crosses between the nonweedy, late-developing Senecio vulgaris subspecie denticulatus and its weedy, early developing derivative subspecie vulgaris. Directional dominance for a reduction of vegetative and reproductive structures was expressed by loci situated near the ray floret locus. These indicated evidence for past directional selection acting on these characters.

Phenotype, Phenotypes

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Quantitative genetics of leaf morphology in Crepis tectorum ssp. pumila (Asteraceae)

Article Abstract:

Small numbers of important genes can govern extreme differences in morphology and may influence the rate of evolution of new adaptions in natural populations. A new study of Crepis tectorum ssp. pumila uses the factorial mating design to investigate the genetic variation in leaf morphology in a population that appears to have a dominant gene causing deep lobed leaves. Details of the study are presented.

Plant genetics, Morphology (Biology), Leaves, Morphology

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The genetic basis of floral variation in Senecio jacobaea (Asteraceae)

Article Abstract:

Research is presented concerning the use of hybrid progenies of between- and within-morph crosses of the ragwort, Senecio jacobaea, to investigate the plant's patterns of segregation. The direction of dominance is discussed.

Heredity, Hybridization, Plant populations

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