▁and ▁shoot ▁mer ist ems . ▁Time - lapse ▁tracking ▁in ▁Norway ▁Spr uce ▁P ice a ▁ab ies ▁revealed ▁that ▁neither ▁single ▁cy top las mic - rich ▁cells ▁nor ▁vac u ol ated ▁cells ▁developed ▁into ▁emb ry os . ▁Pro emb ry ogen ic ▁masses ▁( PE M s ), ▁an ▁intermediate ▁between ▁un organ ized ▁cells ▁and ▁an ▁emb ry o ▁composed ▁of ▁cy top las mic - rich ▁cells ▁next ▁to ▁a ▁vac u ol ated ▁cell , ▁are ▁stim ulated ▁with ▁aux in ▁and ▁cy to kin in . ▁Grad ual ▁removal ▁of ▁aux in ▁and ▁cy to kin in ▁and ▁introduction ▁of ▁ab sc is ic ▁acid ▁( AB A ) ▁will ▁allow ▁an ▁emb ry o ▁to ▁form . ▁Using ▁som atic ▁emb ry ogen esis ▁has ▁been ▁considered ▁for ▁mass ▁production ▁of ▁veget atively ▁propag ated ▁con ifer ▁cl ones ▁and ▁cry op res ervation ▁of ▁germ pl asm . ▁However , ▁the ▁use ▁of ▁this ▁technology ▁for ▁re for est ation ▁and ▁tree ▁bre eding ▁of ▁con if ers ▁is ▁in ▁its ▁inf ancy . ▁ ▁See ▁also ▁Plant ▁emb ry ogen esis ▁Call us ▁( cell ▁bi ology ) ▁Plant ▁t issue ▁culture ▁Plant ▁h orm one ▁Emb ry o ▁Res cue ▁Hyper h yd ric ity ▁Mur ash ige ▁and ▁S ko og ▁medium ▁ ▁References ▁ ▁External ▁links ▁https :// web . archive . org / web / 2 0 1 1 0 9 1 0 1 5 5 2