[1] Univ Copenhagen, Dept Biol, Copenhagen Bioctr, DK-2200 Copenhagen, Denmark
[2] Samuel Roberts Noble Fdn Inc, Div Plant Biol, Ardmore, OK 73401 USA
[3] Univ Copenhagen, Plant Biochem Lab, DK-1871 Frederiksberg C, Denmark
[4] Appalachian State Univ, Dewel Microscopy Facil, Boone, NC 28608 USA
[5] Univ Los Andes, Dept Ciencias Biol, Bogota, Colombia