|Thompson, Maxine - ARS COLLABORATOR|
Submitted to: HortScience
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: December 1, 1995
Publication Date: N/A
Interpretive Summary: The USDA-ARS National Clonal Germplasm Repository-Corvallis, OR holds the national collection of blackberries and raspberries (genus Rubus). One aspect of evaluation of plants is determining the chromosome number. Because of possible sterility problems associated with unbalanced chromosome numbers in progeny, this trait is important for breeders when choosing parental materials for making crosses. Also, since there is such a wide range in numbers in species and cultivars, this trait is useful in verifying the identity of plants. The basic number is universally x=7 and counts presented here range from 2n=14 to 2n=84. Counts are reported for 124 species/varieties, 42 of which are new and 72 confirmations of previous reports.
Technical Abstract: The USDA-ARS National Clonal Germplasm Repository in Corvallis, OR has the responsibility to maintain Rubus germplasm which represents worldwide diversity of this genus. Chromosome numbers are reported for a total of 201 plants representing 124 accessions of species/varieties. There are new reports for 42 taxa, confirmation for 72 of those previously reported, and ten counts for plants unidentified to species. The basic number is un versally x=7, and counts ranged from 2x to 12x.