Mutagenic effects of acute gamma irradiation on miniature roses: target theory approach
1998
Arnold, N.P. | Barthakur, N.N. | Tanguay, M.
Absorbed gamma-ray doses of 50, 100, and 200 Gy were used to produce mutations in miniature rose (Rosa hybrida) bushes of 'Blue Blood' (BB), 'Mountie' (MT), 'Dark Red Mountie' (DM), and 'Potluck' (PL) cultivars. The fairly good agreement achieved between measured and calculated doses from the extended gamma-ray source provided a high degree of confidence in reporting these doses. The relationship between plant height reduction (H) and absorbed dose (D) could be described as H = A - BD + CD2, in accordance with the prediction of the multi-hit target theory, where A, B, and C are constants. The mean spine number per 10 cm of stem, the mean petiole length, and the mean petal number were significantly (P less than or equal to 0.05 to 0.001) reduced in all cultivars depending on D. The total number of mutations was highest in PL. The irradiated plants remained fertile. The range in color increased substantially for all the cultivars. The number of flowers in an inflorescence decreased for PL, BB, and DM but not for MT.
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