Genetic relatedness among eastern North American blackberry ...

4 downloads 38389 Views 78KB Size Report
of Arkansas maintains one of the largest blackberry-breeding programs in the world and thus, in-depth knowledge of the cultivars ... jor objectives of this program are to develop superior .... the application of the unweighted pair-groups method.
Euphytica 139: 95–104, 2004.  C 2004 Kluwer Academic Publishers. Printed in the Netherlands.

95

Genetic relatedness among eastern North American blackberry cultivars based on pedigree analysis Eric T. Stafne∗ & John R. Clark Department of Horticulture, 316 Plant Science, University of Arkansas, Fayetteville, AR 72701, U.S.A.; (∗ author for correspondence: e-mail: [email protected]) Received 11 November 2003; accepted 23 August 2004

Key words: fruit breeding, inbreeding, Rubus subgenus Rubus

Summary Blackberry genetic relationships (Rubus subgenus Rubus Watson) have not been thoroughly studied. The University of Arkansas maintains one of the largest blackberry-breeding programs in the world and thus, in-depth knowledge of the cultivars released from the program and others instrumental in their lineages can aid in breeding endeavors. Pedigrees of 32 cultivars were traced to their founding clones. Genetic contribution (GC), maximum potential similarity (MPS), inbreeding coefficient, and coefficients of relationship (CR) were calculated for all genotypes. Nineteen founding clones contributed to the 32 cultivars, ranging from