2Winton L. Tissuue culture propagation of european aspen [ J ]. For-est Science, 1971,17( 3) :348-350.
3Ahuja M R. Somatic cell differentiation and rapid clonal propaga-tion of aspen[ J]. Silvae Genetica, 1983,32(3/4) : 131-135.
4Vinocur B, Carmi T, Altman A, et al. Enhanced bud regenerationin aspen (Populus tremula L.) roots cultured in liquid media[ J].Plant Cell Reports, 2000,19 ( 12) ; 1146-1154.
5Wang Huimei, Liu Hongmei, Wang Wenjie, et al. Effects of Thidia-zuron,basal medium and light quality on adventitious shoot regen-eration from in vitro cultured stem of Populus alba xP. berolinensis[J]. Journal of Forestry Research,2008,19(3) :257-259.
6Dmytro P Yevtushenko, Santosh Misra. Efficient Agrobacterium-medi-ated transformation of commercial hybrid poplar Populus nigra L. xP. maximowiczii A. Henry [J]. Plant Cell Reports, 2010,29( 3):211-221.
