e-journal

Isolated history of the coastal plant Lathyrus japonicus (Leguminosae) in Lake Biwa, an ancient freshwater lake

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Abstract.
Background and aims:
Lake Biwa is one of the world’s few ancient lakes. Formed
4 million years ago, the lake
harbours many coastal species that commonly inhabit seashores. The beach pea Lathyrus
japonicus is a typical coastal species of this freshwater lake, but its inland populations are
faced with the threat of extinction. Here, we investigated the phylogeographical and population
structures of both inland and coastal populations of L. japonicus. We also elucidated
the historical isolation of the Lake Biwa population.

Methodology:
In total, 520 individuals from 50 L. japonicus populations were sampled throughout the
species distribution in Japan. Chloroplast haplotyping using intergenic spacers psbA–trnH
and atpI–atpH was performed to investigate the phylogeographical structure as well as the
genetic diversity of L. japonicus. Six nuclear microsatellite markers were also used to
analyse the population structure.

Principal results:
Population structure analyses of chloroplast DNA (cpDNA) and nuclear DNA (nDNA) identified
inland and coastal groups. Based on the genetic differentiation, inland populations exhibited
a single cpDNA haplotype and significantly lower values of HS, AR and FIS than coastal populations.
In addition to the presence of a bottleneck, the lack of gene flow among inland populations
was supported by estimates of recent migration rates between subpopulations.

Conclusions:
Our data revealed that inland populations have been isolated in Lake Biwa as ‘landlocked’
populations since the predecessor lake was isolated from sea. This was also seen in a previous
study of Calystegia soldanella. However, the high genetic differentiation, accompanied by a
lack of gene flow among the Lake Biwa populations (according to the BAYESASS+ analysis),
contradicts the results with C. soldanella. We conclude that because of the presence of a bottleneck
and low genetic diversity of the inland populations, self-sustaining population persistence
may be difficult in the future. Conservation strategies must consider the genetic
properties of such isolated populations.

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Informasi Detail

Judul Seri

AoB PLANTS

No. Panggil

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Penerbit

Oxford : Oxford University Press., 2011

Deskripsi Fisik

AoB PLANTS 2011 plr021 doi:10.1093/aobpla/plr021

Bahasa

English

ISBN/ISSN

-

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

2011 plr021

Subjek

BIOTEKNOLOGI TANAMAN

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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