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Titolo:
Nuclear and cytoplasmic contributions to intraspecific divergence in an annual legume
Autore:
Galloway, LF; Fenster, CB;
Indirizzi:
Univ Virginia, Dept Biol, Charlottesville, VA 22903 USA Univ Virginia Charlottesville VA USA 22903 Charlottesville, VA 22903 USA Univ Maryland, Dept Biol, College Pk, MD 20742 USA Univ Maryland College Pk MD USA 20742 Dept Biol, College Pk, MD 20742 USA NTNU, Dept Bot, N-7034 Trondheim, Norway NTNU Trondheim Norway N-7034NTNU, Dept Bot, N-7034 Trondheim, Norway
Titolo Testata:
EVOLUTION
fascicolo: 3, volume: 55, anno: 2001,
pagine: 488 - 497
SICI:
0014-3820(200103)55:3<488:NACCTI>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHAMAECRISTA-FASCICULATA LEGUMINOSAE; PITCHER-PLANT MOSQUITO; GENETIC ARCHITECTURE; WYEOMYIA-SMITHII; POPULATION DIFFERENTIATION; EVOLUTIONARY DIVERGENCE; OUTBREEDING DEPRESSION; NATURAL-SELECTION; LOCAL ADAPTATION; FITNESS;
Keywords:
cytoplasmic effects; dominance; epistasis; genetic architecture; nonadditive genetic variation; population differentiation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
68
Recensione:
Indirizzi per estratti:
Indirizzo: Galloway, LF Univ Virginia, Dept Biol, Charlottesville, VA 22903 USA Univ Virginia Charlottesville VA USA 22903 lle, VA 22903 USA
Citazione:
L.F. Galloway e C.B. Fenster, "Nuclear and cytoplasmic contributions to intraspecific divergence in an annual legume", EVOLUTION, 55(3), 2001, pp. 488-497

Abstract

The genetic architecture of trait differentiation was evaluated between two ecologically distinct populations of Chamaecrista fasiculata. Individualsfrom Maryland and Illinois populations were crossed to create 10 types of seed: Maryland and Illinois parents, reciprocal F-1 and F-2 hybrids, and backcrosses to Maryland and to Illinois on reciprocal F-1 hybrids. Reciprocalcrosses created hybrid generation seeds with both Maryland and Illinois cytoplasmic backgrounds. Experimental individuals were grown in a common garden near the site of the Maryland population, in the garden, plants from theIllinois population flowered, set fruit, and died earlier than those from Maryland, likely reflecting adaptations to differences in growing season length between the two populations. Although reproductive components at the flower and whole plant level differed between the two populations, reproductive output as measured by fruit and seed production was similar. Cytoplasmic genes had a subtle but pervasive effect on population differentiation; hybrids with Maryland cytoplasm were significantly differentiated from those with Illinois cytoplasm when all characters were evaluated jointly. The nuclear genetic architecture of population differentiation was evaluated with joint scaling tests. Depending on the trait, both additive and nonadditive genetic effects contributed to population differentiation. Intraspecific genetic differentiation in this wild plant species appears to reflect a complex genetic architecture that includes the contribution of additive, dominance, and epistatic components in addition to subtle cytoplasmic effects.

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Documento generato il 29/03/20 alle ore 16:58:13