Genomic DNA was isolated from 50 ml of a two-week-old algal cell culture using the Gene Elute™ Plant Genomic DNA Miniprep Kit (Sigma–Aldrich, Hamburg, Germany) according to the manufacturer`s instructions. The chloroplast-encoded gene (rbcL) was amplified from genomic DNA using the proof reading polymerase Phusion (Finnzymes, Thermo Scientific, Schwerte, Germany) according to the manual. The primers used for amplification and the protocol of amplification are the same as in Witkowski et al.56 (link) specified for rbcL sequence.
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