[1] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Biol Sci LCB, Lab Hormonal Control Plant Dev, BR-13418900 Piracicaba, SP, Brazil
[2] Univ Sao Paulo, Ctr Nucl Energy Agr, BR-13400970 Piracicaba, SP, Brazil
[3] W Virginia Univ, Genet & Dev Biol Program, Div Plant & Soil Sci, Morgantown, WV 26506 USA