Abstract
Pelargonium × hortorum ‘Tango Dark Red’, ‘Tango Pink’, ‘Americana Red’, and ‘Rocky Mountain Lavender’ unrooted cuttings were subjected to Electron beam (E-beam) irradiation at 0 (control, no treatment), 0.61 ± 0.04, 0.83 ± 0.07, or 1.02 ± 0.01 kGy (mean ± se, n = 4) in Expt. 1 and 0 (control, no treatment), 0.08 ± 0.00, 0.16 ± 0.00, 0.31 ± 0.00, or 0.57 ± 0.02 kGy (mean ± se, n = 4) in Expt. 2. Cuttings exposed to E-beam irradiation other than the control treatment did not root or form callus and exhibited a change in leaf color from green to red and eventually yellow. Our results suggest that the use of ionizing irradiation for preventing the accidental importation of biothreat agents through unrooted Pelargonium cuttings is not feasible.
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