Transcription factor PagMYB31 positively regulates cambium activity and negatively regulates xylem development in poplar 转录因子PagMYB31正向调控杨树84K品种的形成层活动，并负向调控木质部的发育。 同样有篇文献，二倍体毛白杨基因组~ 二倍体毛白杨（Populus

参考文献 Wen SS, Ge XL, Wang R, Yang HF, Bai YE, Guo YH, Zhang J, Lu MZ, Zhao ST, Wang LQ. An Efficient Agrobacterium-Mediated Transformation Method for Hybrid Poplar 84K (Populus alba × P. glandulosa) U