Abstract
Hairy root formation was induced by inoculating epicotyl, cotyledon and hypocotyl of Allocasuarina verticillata with two strains of Agrobacterium rhizogenes, A4 (agropine type) or 2659 (cucumopine type). Shoot regeneration from hairy roots induced by strain A4, and from control roots excised from untreated seedlings, required a hormone-enriched medium, whereas roots induced by strain 2659 spontaneously regenerated shoots on hormone-free medium. Newly formed shoots were multiplied and rooted to produce transgenic plants that developed unusually extensive, ageotropic root systems. The transformation was demonstrated by the presence of specific opines and by Southern blot analysis.
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