1. Department of Botany and Plant Biology, University of Geneva, 1211 Geneva, Switzerland (S.B., T.B.F.);
2. Institute of Botany, University of Basel, 4056 Basel, Switzerland (A.D., T.B.); and
3. Laboratory of Growth Regulators, Palacky University, and Institute of Experimental Botany, Academy of Sciences of the Czech Republic, 78371 Olomouc, Czech Republic (J.R.)