1. Umeå Plant Science Centre Department of Plant Physiology Umeå University 901 87 Umeå Sweden
2. Department of Biosciences Biotechnologies and Pharmacology Sciences Bari University Via Amendola 165/A 70126 Bari Italy
3. Department of Biochemistry and Food Chemistry, Molecular Plant Biology University of Turku FI‐20014 Turku Finland
4. Institute of Biomembranes and Bioenergetics CNR Via Amendola 165/A 70126 Bari Italy