Abstract
The rooting of stem cuttings is a common vegetative propagation practice in many ornamental species. Among other signals, auxin polarly transported through the stem plays a key role in the formation and growth of adventitious roots. Unlike in other plant species, auxin from mature leaves plays a decisive role in the rooting of carnation (Dianthus caryophyllus. L) cuttings. The gene DcAUX1, which codifies an auxin influx carrier involved in polar auxin transport, has now been cloned and characterized in carnation. The expression pattern of this gene was seen to depend on the organ, the cultivar and the time of cold storage. The variations observed in its expression could be related with the rooting ability of different carnation cultivars.
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