1. Department of Plant Biology and Ecology, University of the Basque Country (UPV/EHU), Barrio Sarriena s/n, Leioa 48940, Spain
2. Laboratory of Macromolecular Chemistry (Labquimac), Department of Physical Chemistry, University of the Basque Country (UPV/EHU), Barrio Sarriena s/n, Leioa 48940, Spain
3. Department of Botany, Ecology and Plant Physiology, University of La Laguna (ULL), Tenerife 38200, Spain