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Infection of Ulmus procera (English elm) cloneSR4 internodal stem explants with Agrobacteriumtumefaciens C58 c1 pRiA4b resulted in callusdevelopment and extensive hairy root production. Shoots which regenerated from hairy roots, followingan extended culture period, were dwarf in stature,with reduced apical dominance and wrinkled leaves whencompared with wild type U. procera SR4. Shootswere rooted...
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