Abstract
Regenerants derived from hairy roots of Ajuga reptans var. atropurpurea induced by infection with Agrobacterium rhizogenes MAFF03-01724 harboring pRi revealed a dwarfing response, i.e. decrease in leaf size, reduction in internode distance, and increase in leaf number. These morphogenic alterations were accompanied by an increase in root mass and lack of floral differentiation. In the pRi-transformed regenerants, the proportion of root mass to whole plant mass was higher than that of the untransformed ones, although both kinds of regenerants were comparable on a fresh weight basis. High capacity of rooting and 20-hydroxyecdysone production associated with the original hairy root line were stably maintained in clonal regenerants.
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