DOI: 10.5061/dryad.4mg2r
title: Data from: Genetic resources of teak (Tectona grandis Linn. f.) – strong genetic structure among natural populations

description: Twenty-nine provenances of teak (Tectona grandis Linn. f.) representing
 the full natural distribution range of the species were genotyped with
 microsatellite DNA markers to analyse genetic diversity and population
 genetic structure. Provenances originating from the semi-moist east coast
 of India had the highest genetic diversity while provenances from Laos
 showed the lowest. In the eastern part of the natural distribution area,
 comprising Myanmar, Thailand and Laos, there was a strong clinal decrease
 in genetic diversity the further east the provenance was located. Overall,
 the pattern of genetic diversity supports the hypothesis that teak has its
 centre of origin in India, from where it spread eastwards. The analysis of
 molecular variance (AMOVA) gave an overall highly significant F st value
 of 0.227—population pairwise F st values were in the range 0.01–0.48.
 Applying the G″st differentiation parameter, the estimated overall
 differentiation was 0.632, implying a strong genetic structure among
 populations. A neighbour-joining (NJ) tree, using the pairwise population
 matrix of G″st values as input, contained three distinct groups: (1) the
 eight provenances from Thailand and Laos, (2) the Indian provenances from
 the dry interior and the moist west coast and (3) the provenances from
 northern Myanmar. The provenances from southern Myanmar were placed close
 to the root of the tree together with the three provenances from the
 semi-moist east coast of India. A Bayesian cluster analysis using the
 STRUCTURE software gave very similar results, with three main clusters,
 each containing two sub-clusters, while Bayesian cluster analysis in the
 Geneland software, exploiting the spatial coordinates of the provenances,
 resulted in five clusters in accordance with the former results. The
 implications of the findings for conservation and use of genetic resources
 of the species are discussed.
description: Genotypic_data_Provenances_Teak_Natural_DistributionThe data is delivered in an input format which can be used in the GenAlEx 6.5 software (Peakall and Smouse 2006, 2012) http://biology-assets.anu.edu.au/GenAlEx/Welcome.html, from where the data can be exported to various other formats. In the first row of the spreadsheet are given numbers which characterize the data: cell A1=”6” says that there are 6 SSR markers, B1=”721” says that there are 721 samples in total, C1=”29” says that there are 29 provenances in the data set. Cell D1=”22” until cell AF1=”27” give the number of samples in each of the 29 provenances. AG=”1” says that there is one region as a starting point. Finally cell AH=”721”says that there are 721 sample sin this single region. In row no. 2 is given information about the data and the names/numbers of the 29 provenances (corresponding to the ones used in the publication) are given in the cells D2 to AF2. In row no. 3 are given headings for the data columns. “Sample No.” (column 1) is an arbitrary number for the samples within provenances. This is not a unique number; several samples have the same sample no. (e.g. “1”). “Population” is the name/number of the provenances. In the following 12 columns (2 for each of the 6 SSRs) the SSR data is coming in the form of alleles coded as their integer size in base pairs (bp). So in column C and D (starting in cells C4 and D4) are the data for the SSR marker 1TA06, etc.Genotypic_data_Provenances_Teak_Natural_DistributionThe same data as in the Genotypic_data_Provenances_Teak_Natural_Distribution.xlsx file (described above), just given as comma delimited file format, starting with one line giving the headings for the rest of the data. “Sample No.” is an arbitrary number for the samples within provenances. This is not a unique number; several samples have the same sample no. (e.g. “1”). “Population” is the name/number of the provenances. The following 12 numbers (2 for each of the 6 SSRs) are the SSR data coming in the form of alleles coded as their integer size in base pairs (bp).