Phylogeographic analysis suggests two origins for the riparian azalea Rhododendron indicum (L.) Sweet.

Heredity
Watanabe YoichiMotomi Ito

Abstract

Ecological speciation is an important factor in the diversification of plants. The distribution of the woody species Rhododendron indicum, which grows along rivers and is able to withstand water flow when rivers flood (i.e. it is a rheophyte), is disjunct, in contrast to the widespread distribution of its relative, Rhododendron kaempferi. This study aimed to elucidate the phylogenetic relationships between R. indicum and R. kaempferi and the evolutionary processes that gave rise to them. The sequences of three non-coding chloroplast DNA regions (total length 1977 bp) were obtained from 21 populations covering the ranges of the two species. In addition, genome-wide SNPs were genotyped from 20 populations using a genotyping by sequencing method. Leaf morphologies were measured for eight representative populations. Two chloroplast DNA haplotypes, which were detected in R. indicum, were shared between the two species. Genome-wide SNPs identified two lineages in R. indicum and these lineages did not constitute a monophyletic group. Each of these two lineages was related to geographically close populations of R. kaempferi. Leaf morphology, which is a characteristic feature in rheophytes, was not differentiated between the two lineage...Continue Reading

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Citations

May 7, 2021·Heredity·Bárbara Simões Santos LealClarisse Palma-Silva

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Methods Mentioned

BETA
genotyping
PCR
electrophoresis
Illumina sequencing
PCA
RAD-seq

Software Mentioned

SHAPE
R
FASTX Toolkit
DNA Baser
R Development Core Team
PLINK
MEGA
MUSCLE
DIYABC
STRUCTURE

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