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Journal of Experimental Botany, Vol 49, 847-852, Copyright © 1998 by Oxford University Press

ARTICLES

Stimulation of scion bud release by rol gene transformed rootstocks of Rosa hybrida L

T van der Salm, R Bouwer, A van Dijk, L Keizer, C Hanisch ten Cate, L van der Plas and J Dons
Department of Developmental Biology, Centre for Plant Breeding and Reproduction Research (CPRO-DLO), PO Box 16, 6700 AA Wageningen, The Netherlands; Department Centre for Biometry Wageningen, Centre for Plant Breeding and Reproduction Research (CPRO-DLO), PO Box 16, 6700 AA Wageningen, The Netherlands; Department of Plant Physiology, Agricultural University Wageningen, PO Box 9101, 6700 HB Wageningen, The Netherlands; Corresponding author at: Florigene Europe b.v., Waardlaan 4A, 2231 NA Rijnsburg, The Netherlands

For improvement of the root characteristics of roses, the rolA, B and C genes from Agrobacterium rhizogenes were introduced in the cultivar Moneyway, which is used as a rootstock. Four independent rolA+B+C transformants were produced. One rolC expressing transformant, showing good growth and clearly decreased apical dominance, was selected for a grafting experiment with the cut rose cultivar Madelon as a scion. Grafting on this rolA+B+C transformed rootstock resulted in a stimulation of both root development of the rootstock and axillary bud release of the untransformed scion. Axillary bud release increased from 0.1 to 0.6 and from 0.3 to 1.3 basal shoots per plant at 15C and 20C, respectively. Since basal shoots from flowers, this altered plant architecture will presumably lead to a more efficient flower production.Keywords: Agrobacterium transformation, apical dominance, rol genes, rootstock, rose.
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