e-journal

Molecular phylogeny of Chinese Rubia (Rubiaceae: Rubieae) inferred from nuclear and plastid DNA sequences

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Rubia L. is the type genus of the coffee family Rubiaceae and the third largest genus in the tribe Rubieae,
comprising ca. 80 species restricted to the Old World. China is an important diversity center for Rubia, where
approximately half of its species occur. However, its internal phylogenetic relationships are still poorly understood.
The objective of the present study is to contribute to the phylogenetic relationships within Rubia, using the nuclear
internal transcribed spacer and six plastid markers and focusing on species from China. Twenty-seven species of
Rubia were sampled to infer their phylogeny using Maximum parsimony, Maximum likelihood, and Bayesian
analyses. The monophyly of Rubia is supported, provided that R. rezniczenkoana Litv. is excluded from Rubia and
transferred to Galium as a new combination: G. rezniczenkoanum (Litv.) L. E Yang & Z. L. Nie. Within Rubia, two clades
are clearly supported. They correspond to the traditional sect. Rubia s.l. (A) and sect. Oligoneura Pojark. (B), and are morphologically mainly separable by their pinnate (A) versus palmate (B) leaf venation. Plesiomorphic features are
the pinnate leaf veining in sect. Rubia s.l. and the occurrence of some species with opposite leaves and true stipules
in sect. Oligoneura. In sect. Oligoneura one can assume an evolution from species with opposite leaves and true
stipules (as in the R. siamensis Craib group) to those with whorls of two leaves and two leaf-like stipules (as in ser.
Chinenses and the R. mandersii Collett & Hemsl. group) and finally with whorls of 6 or even more elements (as in ser.
Cordifoliae). The correlation between clades recognized by DNA analyses and available differential morphological
features is partly only loose, particularly in the group of R. cordifolia with 2
, 4
, and 6
cytotypes. This may be due
to rapid evolutionary divergence and/or hybridization and allopolyploidy.

Key words: molecular phylogeny, morphology (leaves, stipules), Rubieae, taxonomy.

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Ketersediaan

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Informasi Detail

Judul Seri

J. Syst. Evol.

No. Panggil

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Penerbit

: Institute of Botany., 2016

Deskripsi Fisik

J. Syst. Evol. 54 (1): 37–47, 2016

Bahasa

English

ISBN/ISSN

doi: 10.1111/jse.121

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

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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