Mercedes Nieves¹, Enrique Flores², Martin Hagemann³ and Rachel Foster¹, (1)Stockholm University, Department of Ecology, Environment and Plant Sciences, Stockholm, Sweden, (2)CSIC and Universidad de Sevilla, Instituto de Bioquímica Vegetal y Fotosíntesis, Seville, Spain, (3)University of Rostock. Institute of Biological Sciences, Deparment of Plant Physiology, Germany