A 200 mg (dry weight) of each sample was transferred to a 2 ml microcentrifuge tube with two 3 mm tungsten-carbide beads (Qiagen) and ground to a fine powder on a Retsch mill MM 301 (Retsch GmbH, Haan Germany) (2X cycles for 45 s at 25 Hz). Total DNA was extracted from the homogenized contents using a modified CTAB extraction method as described by Doyle and Doyle (1990) , and adapted by Raclariu et al. (2017b) (link). The final elution volume was 100 μl.
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