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  • 1
    Online Resource
    Online Resource
    Quantifying latitudinal clines to light responses in natural populations of Arabidopsis thaliana (Brassicaceae)
    Wiley ; 2002
    In:  American Journal of Botany Vol. 89, No. 10 ( 2002-10), p. 1604-1608
    Details
    In: American Journal of Botany, Wiley, Vol. 89, No. 10 ( 2002-10), p. 1604-1608
    Abstract: Evidence of adaptation in Arabidopsis thaliana (Brassicaceae) phenotypic traits has rarely been shown. We demonstrate latitudinal clines in two A. thaliana traits: hypocotyl responses to red and far‐red light. Natural populations of A. thaliana were sampled along a latitudinal gradient from southern to northern Norway. Seeds from maternal families within each population were subjected to 1 wk of constant red, far‐red, blue, white, and dark treatments. Hypocotyl lengths were measured for each maternal family within each population. Significant variability within and among populations in hypocotyl responses for the various treatments was found. There was a significant latitudinal cline in hypocotyl responses for red and far‐red treatments, with northern populations being more de‐etiolated than southern populations. These results suggest that northern populations are more responsive to red and far‐red light than southern populations. Thus, differentiation of seedling traits in natural populations of A. thaliana seems in part to be mediated by the phytochrome pathway. There was no correlation between hypocotyl responses and flowering time for any treatment. This suggests that flowering time variability and variability in hypocotyl responses may not be governed by genes shared between the pathways, such as those involved in photoreception or the circadian clock.
    Type of Medium: Online Resource
    ISSN: 0002-9122 , 1537-2197
    URL: Article
    DOI: 10.3732/ajb.89.10.1604
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2002
    detail.hit.zdb_id: 2053581-8
    SSG: 12
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  • 2
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    Online Resource
    Comparing the Linkage Maps of the Close Relatives Arabidopsis lyrata and A. thaliana
    Oxford University Press (OUP) ; 2004
    In:  Genetics Vol. 168, No. 3 ( 2004-11-01), p. 1575-1584
    Details
    In: Genetics, Oxford University Press (OUP), Vol. 168, No. 3 ( 2004-11-01), p. 1575-1584
    Abstract: We have constructed a genetic map of Arabidopsis lyrata, a self-incompatible relative of the plant model species A. thaliana. A. lyrata is a diploid (n = 8) species that diverged from A. thaliana (n = 5) ∼5 MYA. Mapping was conducted in a full-sib progeny of two unrelated F1 hybrids between two European populations of A. lyrata ssp. petraea. We used the least-squares method of the Joinmap program for map construction. The gross chromosomal differences between the two species were most parsimoniously explained with three fusions, two reciprocal translocations, and one inversion. The total map length was 515 cM, and the distances were 12% larger than those between corresponding markers in the linkage map of A. thaliana. The 72 markers, consisting of microsatellites and gene-based markers, were spaced on average every 8 cM. Transmission ratio distortion was extensive, and most distortions were specific to each reciprocal cross, suggesting cytoplasmic interactions. We estimate locations and most probable genotype frequencies of transmission ratio distorting loci (TRDL) with a Bayesian method and discuss the possible reasons for the observed distortions.
    Type of Medium: Online Resource
    ISSN: 1943-2631
    URL: Article
    DOI: 10.1534/genetics.103.022343
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2004
    detail.hit.zdb_id: 1477228-0
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  • 3
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    Online Resource
    Nucleotide Variation at the CHALCONE ISOMERASE Locus in Arabidopsis thaliana
    Oxford University Press (OUP) ; 2000
    In:  Genetics Vol. 155, No. 2 ( 2000-06-01), p. 863-872
    Details
    In: Genetics, Oxford University Press (OUP), Vol. 155, No. 2 ( 2000-06-01), p. 863-872
    Abstract: An ~1.9-kb region encompassing the CHI gene, which encodes chalcone isomerase, was sequenced in 24 worldwide ecotypes of Arabidopsis thaliana (L.) Heynh. and in 1 ecotype of A. lyrata ssp. petraea. There was no evidence for dimorphism at the CHI region. A minimum of three recombination events was inferred in the history of the sampled ecotypes of the highly selfing A. thaliana. The estimated nucleotide diversity (θTOTAL = 0.004, θSIL = 0.005) was on the lower part of the range of the corresponding estimates for other gene regions. The skewness of the frequency spectrum toward an excess of low-frequency polymorphisms, together with the bell-shaped distribution of pairwise nucleotide differences at CHI, suggests that A. thaliana has recently experienced a rapid population growth. Although this pattern could also be explained by a recent selective sweep at the studied region, results from the other studied loci and from an AFLP survey seem to support the expansion hypothesis. Comparison of silent polymorphism and divergence at the CHI region and at the Adh1 and ChiA revealed in some cases a significant deviation of the direct relationship predicted by the neutral theory, which would be compatible with balancing selection acting at the latter regions.
    Type of Medium: Online Resource
    ISSN: 1943-2631
    URL: Article
    DOI: 10.1093/genetics/155.2.863
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2000
    detail.hit.zdb_id: 1477228-0
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  • 4
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    Online Resource
    Parallel Patterns of Sequence Variation Within and Between Populations at Three Loci of Arabidopsis thaliana
    Oxford University Press (OUP) ; 2002
    In:  Molecular Biology and Evolution Vol. 19, No. 11 ( 2002-11-01), p. 2030-2034
    Details
    In: Molecular Biology and Evolution, Oxford University Press (OUP), Vol. 19, No. 11 ( 2002-11-01), p. 2030-2034
    Type of Medium: Online Resource
    ISSN: 0737-4038 , 1537-1719
    URL: Article
    DOI: 10.1093/oxfordjournals.molbev.a004027
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2002
    detail.hit.zdb_id: 2024221-9
    SSG: 12
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