1. Laboratory
of Nuclear Instrumentation (LIN), Center of Nuclear Energy in Agriculture
(CENA), University of São Paulo (USP), Piracicaba, São Paulo 13416000, Brazil
2. Laboratory
of Plant Development and Structure (LaBDEV), Center of Nuclear Energy
in Agriculture (CENA), University of São Paulo (USP), Piracicaba, São Paulo 13416-000, Brazil
3. Department
of Ecological Science, Faculty of Science, Vrije Universiteit, De Boelelaan 1085, 1081HV Amsterdam, The Netherlands