5Busov V B,Meilan R,Pearce D W,et al.2003.Activation tagging of a dominant gibberellin catabolism gene (GA 2-oxidase) from poplar that regulates tree stature.Plant Physiol,132 (3):1283 -1291.
6Cline M G,Thangavelu M,Dong-Ⅱ K.2006.A possible role of cytokinin in mediating long-distance nitrogen signaling in the promotion of sylleptic branching in hybrid poplar.J Plant Physiol,163 (6):684 -688.
7Dluzniewska P,Gessler A,Kopriva S,et al.2006.Exogenous supply of glutamine and active cytokinin to the roots reduces NO3-uptake rates in poplar.Plant Cell Environ,29(7):1284 -1297.
8lsraelsson M,Mellerowicz E,Chono M,et al.2004.Cloning and overproduction of gibberellin 3-oxidase in hybrid aspen trees.Effects on gibberellin homeostasis and development.Plant Physiol,135 (1):221-230.
9Israelsson M,Sundberg B,Moritz T.2005.Tissue-specific localization of gibberellins and expression of gibberellin-biosynthetic and signaling genes in wood-forming tissues in aspen.Plant J,44 (3):494-504.
10Sasamoto H,Ogita S,Wakita Y,et al.2002.Endogenous levels of abscisic acid and gibberellins in leaf protoplants competent for plant regeneration in Betula platyphylla and Populus alba.Plant Growth Regulation,38 (184):195 -201.
