University of Milan - Department of Biosciences, University of Milan - Department of Biosciences, Université de Lyon - Laboratoire Reproduction et Développement des Plantes, University of Milan - Dipartimento di Bioscienze, University of Nottingham - School of Mathematical Sciences, University of Nottingham - School of Biosciences, Humboldt-Universität zu Berlin - Plant Cell and Molecular Biology, Humboldt-Universität zu Berlin - Plant Cell and Molecular Biology, Humboldt-Universität zu Berlin - Plant Cell and Molecular Biology, University of Milan - Department of Biosciences, Université de Lyon - Laboratoire Reproduction et Développement des Plantes, Wageningen University - Laboratory of Biochemistry, University of Nottingham - School of Biosciences, University of Nottingham - School of Biosciences, University of Nottingham - School of Biosciences and University of Milan - Dipartimento di Bioscienze