e-journal

Intraspecific diversity in Sinningia speciosa (Gesneriaceae: Sinningieae), and possible origins of the cultivated florist’s gloxinia

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Abstract.
Background and aims:
The florist’s gloxinia is a familiar houseplant in the Gesneriaceae, the botanical family
that includes the African violet (Saintpaulia) and other ornamental species. The gloxinia’s
wild progenitor is Sinningia speciosa (Lodd.) Hiern, a Brazilian endemic. Although it has
been cultivated for almost 200 years, little is known about the genetic diversity in
S. speciosa, how the wild populations relate to one another or even where the cultivated
forms originated. Using available wild collections, preliminary phenetic and phylogenetic
investigations were conducted to elucidate the interspecific relationships within S. speciosa
and to infer the origins of the cultivars.

Methodology:
Amplified fragment length polymorphism (AFLP) analysis was applied to 24 accessions
of S. speciosa (17 wild collections, seven cultivars) and one accession each of Sinningia
guttata and Sinningia macrophylla. A maximum likelihood (ML) tree was also calculated
from an alignment of the nuclear ribosomal internal transcribed spacer sequence from the
same 26 accessions.

Principal results:
Dice/UPGMA and principal coordinates analysis of the AFLP data partitioned S. speciosa into
several distinct clusters, one of which included S. macrophylla. All cultivated ‘gloxinias’
grouped together in a major cluster with plants from Rio de Janeiro. The AFLP results were
compared with a phylogenetic analysis of the ribosomal spacer region, which was informative
in S. speciosa. The ML tree generally supported the AFLP results, although several clades
lacked strong statistical support.

Conclusions:
Independent analyses of two different data sets show that S. speciosa is a diverse species
comprised of several lineages. Genetic distance estimates calculated from the AFLP data
were positively correlated with geographic distances between populations, indicating that reproductive
isolation could be driving speciation in this taxon. Molecular markers are under development
for population genetic studies in S. speciosa, which will make it possible to define
evolutionarily significant units for purposes of conservation.

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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: pls039; doi:10.1093/aobpla/pls039

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: pls039

Subjek

EKOLOGI TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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