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Molecular phylogeography of four endemic Sagittaria species (Alismataceae) in the Sino-Japanese Floristic Region of East Asia

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To reveal the role of climate oscillations of the Quaternary in forming the contemporary plant diversity in the
temperate Sino-Japanese Floristic Region of mainland China, we assess the phylogeographical patterns of four
Sagittaria species in the region using sequence data from plastid DNA non-coding regions (psbA-trnH, the rpl16
intron and trnC-ycf6) and the internal transcribed spacers of nuclear ribosomal DNA (nrITS). Based on both
datasets, the divergence time among the four studied species was estimated to fall in the Late Tertiary (plastid
DNA: 7.1–13.7 Mya; ITS: 11.1–16.1 Mya). The ancestral distribution analyses revealed that regions with a great
diversity in topography, climate and ecological conditions, e.g. the Hengduan Mountains, Central China and East
China, were the areas where the endemics originated. Mismatch distribution analyses revealed that each species
had experienced a range expansion in response to Quaternary climatic oscillations. Our findings contradict the
hypothesis of Quaternary origins of the endemic Sagittaria spp.; we support the view that modern species in
the Northern Hemisphere originated mostly during the Tertiary. Range expansion may have profoundly modified
the current distribution ranges of Sagittaria species in the Sino-Japanese Floristic Region.


ADDITIONAL KEYWORDS: ancestral distribution – chloroplast DNA – divergence time – nuclear DNA –quaternary climatic oscillations – regional expansion.

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Ketersediaan

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Informasi Detail

Judul Seri

Botanical Journal of the Linnean Society

No. Panggil

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Penerbit

: The Linnean Society of London., 2016

Deskripsi Fisik

Botanical Journal of the Linnean Society, 2016, 180, 6–20.

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

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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