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In vivo characterization of a graft-transmissible, free-branching agent in poinsettia



In vivo characterization of a graft-transmissible, free-branching agent in poinsettia



Journal of the American Society for Horticultural Science 117(6): 972-975



The free-branching poinsettia (Euphorbia pulcherrima Willd. ex. Kotzsch) cultivar Annette Hegg Brilliant Diamond (BD) contained a free-branching agent that was graft-transmissible to the restricted-branching cultivar Eckespoint C-1 Red (CR). CR plants were transformed by the agent regardless of whether BD plants were used as scion or stock, indicating that the agent moved basipetally and acropetally through the graft union. The agent was repeatedly trnasmitted to a CR plant by serial grafting with a free-branching poinsettia plant. A minimum of 10 days contact through grafting was required for BD plants to transmit the agent to CR plants. Percentage of plants exhibiting the free-branching characteristic increased from 0% for lt 10 days of graft contact with BD plants to 100% after 30 days.

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Accession: 008841147

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