The segments of Alhagi pseudalhagi seedlings were regenerated easily in vitro .The regenerated shoots were excised,then infected and cultured with Agrobacterium rhizogenes A 4 strain.The transformants (hairy roots and transformed calluses) were obtained by selection on hormone free medium.Paper electrophoresis revealed that over 95% of hairy roots and 75% of transformed calluses could synthesis agropine and mannopine.The effects of several factors on transformation frequency and growth of the h...