“…Therefore, contrary to conception on the wastefulness of photorespiration, proposed in the many years by different authors (Zelitch 1966, 1971, 1973, 1975, Zelitch and Day 1973, Chollet and Ogren 1975, Kelly and Latzko 1976, Ogren 1976, 2003, Servaites and Ogren 1977, Holaday and Chollet 1984, Leegood et al 1995, Somerville 2001, Igarashi et al 2006, Long et al 2006, Kebeish et al 2007, Khan 2007, Mueller‐Cajar and Whitney 2008, Maurino and Peterhansel 2010, Peterhansel et al 2010, Peterhansel and Maurino 2011), our comprehensive investigations on the different aspects of photorespiration indicate that photorespiration is one of the evolutionarily developed vital metabolic processes in plants. The attempts to reduce this process with the purpose of increasing the crop productivity are inconsistent (Aliev et al 1988, 1996a, 1996b, Aliyev et al 1992, Aliev and Kazibekova 1995, Aliyev 1998, 2001, 2004, 2007). PGPase, a key enzyme of photorespiration was first homogeneously purified from the eukaryotic green algae Chlamydomonas reinhardtii with subsequent determination of the complete nucleotide and deduced amino acid sequences (Mamedov et al 2001, 2002, Mamedov and Suzuki 2002) (NCBI Nucleotide 1:AB052169).…”