e-journal

The base number of ‘loxoscaphoid’ Asplenium species and its implication for cytoevolution in Aspleniaceae

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Background and Aims ‘Loxoscaphoid’ Asplenium species are morphologically a remarkably distinct group of
Aspleniaceae. Except for two preliminary chromosome counts of Asplenium theciferum, the cytology of this
group of species has, however, been largely unstudied.
Methods Chromosome counts were obtained by acetocarmine squash preparations of one mitotic cell and
several meiotic cells. Relative DNA content of gametophytic and sporophytic cells was determined by flow cytometry. The phylogenetic placement of A. loxoscaphoides, A. rutifolium s.l. and A. theciferum s.l. was investigated through an analysis of rbcL sequences.
Key Results The dysploid base number is reported to be x ¼ 35 in Asplenium centrafricanum,
A. loxoscaphoides, A. sertularioides and A. theciferum. Analysis of rbcL sequences confirms that ‘loxoscaphoids’ nest robustly within Asplenium. Several high ploidy levels exceeding the tetraploid level were found in A. theciferum s.l. and A. rutifolium s.l. All taxa proved to be sexual.
†Conclusions Four base numbers are known at present for Aspleniaceae: x ¼ 39, 38, 36 and 35. The dysploid
base number x ¼ 35 found in the ‘loxoscaphoid’ Asplenium spp. sheds a novel light on the cytoevolution of
the whole family. We postulate a recurrent descending dysploid evolution within Aspleniaceae, leading to speciation at the (sub)generic and species/group level.
Key words: Dysploidy, cytology, cytoevolution, Aspleniaceae, Asplenium centrafricanum, Asplenium
loxoscaphoides, Asplenium rutifolium, Asplenium sertularioides, Asplenium theciferum, polyploidization,
chromosome base number, aneuploidy.

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Informasi Detail

Judul Seri

Annals of Botany

No. Panggil

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Penerbit

: Oxford University Press on behalf of the Annals of Botany Company., 2010

Deskripsi Fisik

Annals of Botany 106: 157–171, 2010

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

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Subjek

PERTANIAN.

Info Detail Spesifik

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Pernyataan Tanggungjawab

yuli/agus

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