The Evolution of Self-Pollination in Clarkia xantiana

Moore, D. M.; Lewis, Harlan

doi:10.2307/2406299

Cited by 94 publications

(128 citation statements)

References 7 publications

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“…Macnair & Cumbes (1989) (Carr & Fenster, 1994). Taken together, these results suggest that mating system may or may not be a correlated response to selection for rapid development (Lloyd, 1965;Moore & Lewis, 1965;Solbrig & Rollins, 1977). The trajectory of trait evolution will ultimately depend on the genetic architecture particular to the evolutionary lineage.…”

Section: Gene Actionmentioning

confidence: 98%

Quantitative genetics of mating system divergence in the yellow monkeyflower species complex

Fenster

Ritland

1994

Heredity

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To study the genetic basis of phenotypic changes in floral characters associated with mating system divergence in the yellow monkeyflowers (Mimulus, section Simiolus), all pairwise crosses were conducted between four taxa, of which two were independently evolved inbreeders. The effective number of genetic factors differentiating taxa for each of six characters was estimated from backcross and F2 segregation variances, using a model that incorporates dominance. The number of factors, averaged over taxa pairs, ranged from 5.3 (for stigma-anther separation) to 12.8 (for pistil length). Dominance was slight to moderate for most characters, with a slight bias for inbreeding characteristics to be dominant over outbreeding traits. F2 segregation patterns indicate strong genetic correlations among floral size characters but variable correlation of these characters with flowering time and little correlation with stigma-anther separation. Crosses between the two selfing and two outcrossing taxa did not lead to the recovery of extreme transgressive segregants in the F2. These results suggest that either homologous loci are involved in repeated shifts to selfing or that the likelihood of appearance of novel recombinations is limited by the large number of loci, each with small effect. The implications of these results are discussed in the context of recent models of mating system evolution.

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Section: Gene Actionmentioning

confidence: 98%

Quantitative genetics of mating system divergence in the yellow monkeyflower species complex

Fenster

Ritland

1994

Heredity

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“…Also, selfing and outcrossing variants in C. xantiana differ in petal size and time of stigma maturation. The genetic basis of these traits was studied by Moore and Lewis (1965).…”

Section: Introductionmentioning

confidence: 99%

Genetic studies of the pattern of floral pigmentation in Clarkia gracilis

Gottlieb

Ford

1988

Heredity

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The flowers of Clarkia gracilis subsp. sonomensis have large petals each with a large, central, red-purple spot while the flowers of subsp. gracilis are small and unspotted. Other pigmentation (anthocyanin) patterns also vary within and between these subspecies. We carried out a genetic analysis of differences in floral patterns and petal size. A novel basal petal spot appeared in the F2. The analysis indicated that the novel petal spot was specified by an allele in subsp. gracilis at a locus governing spot position. This allele is not normally expressed in subsp. gracilis because of the action of a modifier gene at a second locus. The study also indicated single factor inheritance for presence versus absence of pigmentation on the hypanthium, stamens, and the lower portion of the petals. Multifactorial inheritance was observed for differences in petal length and width. Most of the possible recombinant floral patterns were recovered in the F2 and F3. This system can be used to study developmental regulation of floral traits as well as ecological relationships between floral pattern and pollination system. The recovery of a normally unexpressed allele for basal petal spot points to the difficulty of extrapolating from phenotypic analysis to an understanding of morphological evolution.

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“…(iv) Earliness offlowering. Self-fertility in the early flowering types would be advantageous because there may be few other plants in flower to pollinate them (Moore and Lewis, 1965).…”

Section: Introductionmentioning

confidence: 99%

“…Useful recessive genes will be unmasked more easily by inbreeding. Moore and Lewis (1965) describe a derived self-fertile population of Clarkia which has white petals (recessive).…”

Section: Introductionmentioning

confidence: 99%