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Ian Smith HortiCulture
Unfortunately, due to irregularities in the initial registration under the fledgling South African PVR registration authority, the registration was challenged in Europe and overturned.Amateur Canna enthusiasts confused the issue by claiming that the Tropicanna form was named Durban, however, the true Durban had red flowers whereas Tropicanna had orange flowers. DNA fingerprinting conducted by a prominent Australian University, as expected, clearly showed a difference between Tropicanna and Durban and other comparators.

Tropicanna Gold (Mactro) was also compared using DNA with various green/gold forms of canna collected from several sources in Europe, USA, New Zealand and Australia. These results showed Tropicanna Gold was different to the available forms of green/gold canna and supported the macro comparisons made between plants based on foliage, flower and form.

Tropicanna Gold PVR registration was challenged in Europe, however, test results from the comparisons made by the Community Plant Variety Office's own testing station showed that Tropicanna Gold was different from the closest comparator.

Tropicanna Black (Lon01) has also been subjected to DNA fingerprinting and has been shown to be different from available comparators.

The use of DNA fingerprinting in identifying horticultural plant cultivars is becoming more widespread and is likely to have a significant role in determining differences between similar plants.
Use of DNA to distinguish between Canna cultivars.
The use of DNA Fingerprinting on plants has increased significantly over recent years. With the refinement of techniques and the wider acceptance of the results, it is now a useful tool in the identification of new cultivars.
Most new Canna selections have resulted from chance findings of sports or seedlings of unknown parentage. This, plus the tendency of amateur Canna enthusiasts and some commercial nurseries to rename selections has led to uncertainty in Canna naming.

Canna phasion cv. Tropicanna was originally sourced in South Africa and subsequently registered under Plant Variety Rights globally.