Blackberry - Prime-Ark 45, (APF-45)


Blackberry named ‘Prime-Ark 45’, (APF-45)



Prime-Ark®45 Primocane-Fruiting Blackberry


Prime-Ark®45 primocane-fruiting blackberry is the third release of this new type of blackberry plant by the University of Arkansas, Division of Agriculture.  The initial seedling plant of Prime-Ark®45 was selected in June, 2002 in a seedling field at the University of Arkansas Fruit Research Station, Clarksville, during the floricane fruiting season. It was tested as selection APF-45. At the time of selection it was noted to be the firmest fruit of any primocane-fruiting selection found at the time in the primocane-fruiting blackberry breeding program.


Type:  Erect, primocane-fruiting.


Ripe Date:  Floricane first harvest date for Prime-Ark®45 averaged 9 June in Arkansas, 4 days after Prime-Jim and Natchez and 4 days before Ouachita. Primocane first bloom date for Prime-Ark®45 was about 2 weeks later than that for Prime-Jan and Prime-Jim. Likewise, primocane fruit ripened 2-3 weeks later for Prime-Ark®45 compared to Prime-Jan and Prime-Jim, averaging August 8. In California, ripening of primocane fruit was in late August and in Oregon was mid-September. This later primocane fruit ripening date should be noted as the harvest date may be an issue in northern areas to complete the fruit ripening period. Likewise this later ripening date could be a major asset for production in areas where later fruiting is desired.


Berry Characteristics:  Fruits of Prime-Ark®45 are medium-large, averaging 6 g or more in most trials measuring floricane fruits in Arkansas. In trials in Oregon and California, primocane fruits averaged just over 7 g and near 9 g, respectively. In Arkansas, primocane fruits are smaller, usually 4 to 5 g.  Prime-Ark®45 is considered to have substantially improved fruit quality over previous primocane-fruiting releases, particularly for potential for successful shipping and postharvest handling.  Average soluble solids (a measurement of sweetness) of Prime-Ark®45 averaged 9.796, just under that of Ouachita in Arkansas. In additional measurements in other plantings and years, soluble solids of 10 to 11% have been measured on floricane fruits of Prime-Ark®45. Primocane fruit soluble solids levels have achieved 12%. Overall fruit flavor ratings for Prime-Ark®45 were higher than the previous primocane-fruiting releases, and were near that of Ouachita.


Plant Characteristics:  Fruit yields have been very good in trials of Prime-Ark®45. Most of the yield evaluation in Arkansas has been done on floricanes, and in a 2007-established planting that fruited in 2008, fioricane yields of Prime-Ark®45 exceeded Prime-Jim and were comparable to thornless, floricane-fruiting varieties. In a 2005-established trial, Prime-Ark®45 was comparable to Natchez in 2008 for floricane yields. For primocane yields, data from Arkansas showed higher yields for Prime-Ark®45 compared to Prime-Jim.  In observational plots in California and Oregon, primocane yields were very good. Prime-Ark®45 out-yielded both Prime-Jim and Prime-Jan in California (the latter two varieties were not present for comparison in Oregon).

Canes of Prime-Ark®45 are very erect, equal or exceeding comparison varieties. Cane health and vigor ratings were comparable to comparison varieties. Disease resistance has been good, and no orange rust has been seen on the new variety. Anthracnose has rarely been seen on fruits or canes of Prime-Ark®45. The variety has not been exposed to double blossom/rosette, so no information on susceptibility exists. Floricane hardiness has not been well characterized due to moderate winters during testing, but canes have fruited after winter lows near 10 to 12'F.





Patent Information:
App Type Country Serial No. Patent No. File Date Issued Date Expire Date
Plant United States 12/802,283 PP22,449 6/3/2010 1/10/2012 6/3/2030
Fruit Crops
For Information, Contact:
Bryan Renk
Associate Director for Technology Commercialization
University of Arkansas TCO
John Clark
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