e-journal

Genome size variation and incidence of polyploidy in Scrophulariaceae sensu lato from the Iberian Peninsula

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Abstract.
Background and aims:
In the last decade, genomic studies using DNA markers have strongly influenced the current
phylogeny of angiosperms. Genome size and ploidy level have contributed to this discussion,
being considered important characters in biosystematics, ecology and population biology.
Despite the recent increase in studies related to genome size evolution and polyploidy
incidence, only a few are available for Scrophulariaceae. In this context, we assessed the
value of genome size, mostly as a taxonomic marker, and the role of polyploidy as a
process of genesis and maintenance of plant diversity in Scrophulariaceae sensu lato in the
Iberian Peninsula.

Methodolog:
Large-scale analyses of genome size and ploidy-level variation across the Iberian Peninsula
were performed using flow cytometry. One hundred and sixty-two populations of 59 distinct
taxa were analysed. A bibliographic review on chromosome counts was also performed.

Principal results:
From the 59 sampled taxa, 51 represent first estimates of genome size. The majority of the
Scrophulariaceae species presented very small to small genome sizes (2C ≤ 7.0 pg). Furthermore,
in most of the analysed genera it was possible to use this character to separate several
taxa, independently if these genera were homoploid or heteroploid. Also, some genomerelated
phenomena were detected, such as intraspecific variation of genome size in some
genera and the possible occurrence of dysploidy in Verbascum spp. With respect to polyploidy,
despite a few new DNA ploidy levels having been detected in Veronica, no multiple cytotypes
have been found in any taxa.

Conclusions:
This work contributed with important basic scientific knowledge on genome size and polyploid
incidence in the Scrophulariaceae, providing important background information for subsequent
studies, with several perspectives for future studies being opened.

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Informasi Detail

Judul Seri

AoB PLANTS

No. Panggil

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Penerbit

Oxford : Oxford University Press on behalf of the Annals of Botany Company., 2012

Deskripsi Fisik

AoB PLANTS 2012: pls037; doi:10.1093/aobpla/pls037

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2012: pls037

Subjek

PEMULIAAN TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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