EgMYB1, an R2R3 MYB transcription factor from eucalyptus negatively regulates secondary cell wall formation in Arabidopsis and poplar. de réir Legay, S, Sivadon, P, Blervacq, A, Pavy, N, Baghdady, A, Tremblay, L, Levasseur, C, Ladouce, N, Lapierre, C, Séguin, A, Hawkins, S, Mackay, J, Grima-Pettenati, J