BainardVillarreal2013

Référence

Bainard, J.D., Villarreal, J.C. (2013) Genome size increases in recently diverged hornwort clades. Genome, 56(8, 1, SI):431-435.

Résumé

As our knowledge of plant genome size estimates continues to grow, one group has continually been neglected: the hornworts. Hornworts (Anthocerotophyta) have been traditionally grouped with liverworts and mosses because they share a haploid dominant life cycle; however, recent molecular studies place hornworts as the sister lineage to extant tracheophytes. Given the scarcity of information regarding the DNA content of hornworts, our objective was to estimate the 1C-value for a range of hornwort species within a phylogenetic context. Using flow cytometry, we estimated genome size for 36 samples representing 24 species. This accounts for roughly 10% of known hornwort species. Haploid genome sizes (1C-value) ranged from 160 Mbp or 0.16 pg (Leiosporoceros dussii) to 719 Mbp or 0.73 pg (Nothoceros endiviifolius). The average 1C-value was 261 +/- 104 Mbp (0.27 +/- 0.11 pg). Ancestral reconstruction of genome size on a hornwort phylogeny suggests a small ancestral genome size and revealed increases in genome size in the most recently divergent clades. Much more work is needed to understand DNA content variation in this phylogenetically important group, but this work has significantly increased our knowledge of genome size variation in hornworts.

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@ARTICLE { BainardVillarreal2013,
    AUTHOR = { Bainard, J.D. and Villarreal, J.C. },
    TITLE = { Genome size increases in recently diverged hornwort clades },
    JOURNAL = { Genome },
    YEAR = { 2013 },
    VOLUME = { 56 },
    NUMBER = { 8, 1, SI },
    PAGES = { 431-435 },
    MONTH = { aug },
    ISSN = { 0831-2796 },
    ABSTRACT = { As our knowledge of plant genome size estimates continues to grow, one group has continually been neglected: the hornworts. Hornworts (Anthocerotophyta) have been traditionally grouped with liverworts and mosses because they share a haploid dominant life cycle; however, recent molecular studies place hornworts as the sister lineage to extant tracheophytes. Given the scarcity of information regarding the DNA content of hornworts, our objective was to estimate the 1C-value for a range of hornwort species within a phylogenetic context. Using flow cytometry, we estimated genome size for 36 samples representing 24 species. This accounts for roughly 10% of known hornwort species. Haploid genome sizes (1C-value) ranged from 160 Mbp or 0.16 pg (Leiosporoceros dussii) to 719 Mbp or 0.73 pg (Nothoceros endiviifolius). The average 1C-value was 261 +/- 104 Mbp (0.27 +/- 0.11 pg). Ancestral reconstruction of genome size on a hornwort phylogeny suggests a small ancestral genome size and revealed increases in genome size in the most recently divergent clades. Much more work is needed to understand DNA content variation in this phylogenetically important group, but this work has significantly increased our knowledge of genome size variation in hornworts. },
    DOI = { 10.1139/gen-2013-0041 },
    EISSN = { 1480-3321 },
    ORCID-NUMBERS = { Villarreal A., Juan Carlos/0000-0002-0770-1446 },
    RESEARCHERID-NUMBERS = { Villarreal A., Juan Carlos/C-6277-2018 },
    UNIQUE-ID = { ISI:000326398100003 },
}

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