Genome size variation in &lt;i&gt;Hordeum spontaneum&lt;/i&gt; populations

Turpeinen, Timo; Kulmala, Johanna; Nevo, Eviatar

doi:10.1139/gen-42-6-1094

Cited by 4 publications

(2 citation statements)

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“…Genome sizes of the accessions investigated increased slightly but signi®cantly from north to south and from west to east. Previous studies have found positive correlations between the duration of the vegetative period and genome sizes in various angiosperms (Bennett, 1987;Reeves et al, 1998;Turpeinen et al, 1999). This seems to agree with the data given here.…”

Section: Discussionsupporting

confidence: 93%

Genome Size Variation among Accessions of Arabidopsis thaliana

Schmuths

Meister²,

Horres³

et al. 2004

Annals of Botany

117

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Section: Discussionsupporting

confidence: 93%

Genome Size Variation among Accessions of Arabidopsis thaliana

Schmuths

Meister²,

Horres³

et al. 2004

Annals of Botany

117

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“…Members of this family are transcriptionally (22) and translationally (23) active, encoding both a polyprotein (24,25) and processing signals (26), which are functionally conserved. The BARE-1 copy number is positively correlated with both genome size and habitat aridity (10), factors that are themselves correlated (27) regionally in H. spontaneum.…”

mentioning

confidence: 99%

Genome evolution of wild barley ( Hordeum spontaneum ) by BARE -1 retrotransposon dynamics in response to sharp microclimatic divergence

Kalendar

Tanskanen

Immonen

et al. 2000

Proc. Natl. Acad. Sci. U.S.A.

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541

393

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The replicative spread of retrotransposons in the genome creates new insertional polymorphisms, increasing retrotransposon numbers and potentially both their share of the genome and genome size. The BARE-1 retrotransposon constitutes a major, dispersed, active component of Hordeum genomes, and BARE-1 number is positively correlated with genome size. We have examined genome size and BARE-1 insertion patterns and number in wild barley, Hordeum spontaneum, in Evolution Canyon, Lower Nahal Oren, Mount Carmel, Israel, along a transect presenting sharply differing microclimates. BARE-1 has been sufficiently active for its insertional pattern to resolve individuals in a way consonant with their ecogeographical distribution in the canyon and to distinguish them from provenances outside the canyon. On both slopes, but especially on the drier south-facing slope, a simultaneous increase in the BARE-1 copy number and a decrease in the relative number lost through recombination, as measured by the abundance of solo long terminal repeats, appear to have driven the BARE-1 share of the genome upward with the height and dryness of the slope. The lower recombinational loss would favor maintenance of more full-length copies, enhancing the ability of the BARE-1 family to contribute to genome size growth. These local data are consistent with regional trends for BARE-1 in H. spontaneum across Israel and therefore may reflect adaptive selection for increasing genome size through retrotransposon activity.

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Microsatellite diversity associated with ecological factors in Hordeum spontaneum populations in Israel

Turpeinen¹,

Tenhola²,

Manninen³

et al. 2001

Molecular Ecology

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Microsatellite diversity at 18 loci was analysed in 94 individual plants of 10 wild barley, Hordeum spontaneum (C. Koch) Thell., populations sampled from Israel across a southward transect of increasing aridity. Allelic distribution in populations was not distributed randomly. Estimates of mean gene diversity were highest in stressful arid-hot environments. Sixty-four per cent of the genetic variation was partitioned within populations and 36% between populations. Associations between ecogeographical variables and gene diversity, H(e), were established in nine microsatellite loci. By employing principle component analysis we reduced the number of ecogeographical variables to three principal components including water factors, temperature and geography. At three loci, stepwise multiple regression analysis explained significantly the gene diversity by a single principal component (water factors). Based on these observations it is suggested that simple sequence repeats are not necessarily biologically neutral.

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Genome size variation in <i>Hordeum spontaneum</i> populations

Cited by 4 publications

References 0 publications

Genome Size Variation among Accessions of Arabidopsis thaliana

Genome Size Variation among Accessions of Arabidopsis thaliana

Genome evolution of wild barley ( Hordeum spontaneum ) by BARE -1 retrotransposon dynamics in response to sharp microclimatic divergence

Microsatellite diversity associated with ecological factors in Hordeum spontaneum populations in Israel

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