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ISHS Acta Horticulturae 1133: XI International Rubus and Ribes Symposium

Development of a multiplexed fingerprinting set in blackberry

Authors:   N.V. Bassil, A.M. Nyberg, C.E. Finn, J.R. Clark, C.P. Peace, A. Iezzoni
Keywords:   simple sequence repeat (SSR) markers, Rubus species
DOI:   10.17660/ActaHortic.2016.1133.14
Abstract:
A reliable and fast method for confirming identity and paternity in blackberry is needed. Microsatellite or simple sequence repeat (SSR) markers are ideal for cultivar fingerprinting, paternity testing and identity certification. The objective of this study was to develop a multiplexed fingerprinting set composed of trinucleotide-containing SSRs and to use them to confirm parentage in breeding populations. Fifteen mapped trinucleotide-containing SSRs were used to screen a test panel of 13 diverse blackberry cultivars from the USDA-ARS National Clonal Germplasm Repository (NCGR) blackberry collection. They were first rated for ease of scoring and polymorphism. The ten SSRs that were polymorphic and easy to score were then evaluated for lack of interaction in multiplex Polymerase Chain Reaction (PCR) after separation of the resulting PCR products by capillary electrophoresis. Each of the SSRs in the resulting two multiplexes generated the same profile in the 13 panel members irrespective of amplification in simplex or multiplex PCR. Both multiplexes differentiated the 13 blackberry cultivars. We plan on evaluating each of these multiplexes for trueness-to-type testing and paternity confirmation of blackberries in the NCGR collection and from eastern and western US breeding populations.

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