Cleared MSAP bands were scored using two methods modified from Noyer et al. (2005)
and Keyte et al. (2006). Firstly, only EcoRI-MspI bands were score as “1” for the presence of
bands and “0” for the absence of bands for standard AFLP analysis. Secondly, bands from both
EcoRI-MspI and EcoRI-HpaII of individuals were compared to interpret the MS-AFLP data. If
the band was present in both digestion sets, it was scored as “1” and if the band was present in
only one set, it was scored as “0”. The scored bands from both methods were analyzed separately
and in combination. Genetic similarity was estimated using a simple-matching coefficient (Sneath
and Sokal, 1973). Phylogenetic tree construction and principal component analysis (PCA) were
performed using the NTSYS-Pc computer software, version 2.2k (Rohlf, 2005). The cophenetic
values and Maxcomp command were used to measure the goodness of fit for a cluster analysis.
The polymorphic information content (PIC) of each marker was also calculated using PIC = 1 - Σ
Pi2, where Pi is the frequency of the present and absent alleles (Ott, 1991).