Abstract
Primocane-fruiting blackberry breeding was initiated in the early 1990s at the University of Arkansas. The source of this trait is the diploid genotype ‘Hillquist’. Introductions from this effort are the cultivars Prime-Jim® and Prime-Jan®. These genotypes are intended for home-garden use as a result of lack of quality for commercial production. Several traits have been identified that are high priorities in primocane blackberry breeding advancement, including heat tolerance of flowers and fruits, fruit quality, thornlessness, and time of fruit ripening. Progress in addressing these limitations through breeding has been positive and the outlook for further improvement of this type of blackberry is promising.
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