Volume 63 Number 4 Article 2
Year 2009 Month 10
Title: Inheritance of the Cr Gene in Ribes nigrum
Authors: D.T. Dalton and K.E. Hummer
Abstract:
Resistance to white pine blister rust (WPBR) disease, caused by Cronartium ribicola J.C. Fischer, is a critical
objective for plant breeders seeking to release new black currant (Ribes nigrum L.) cultivars in North America.
Genetic immunity to the disease was discovered in the Asiatic species, R. ussuriense Jancz. in the 1930s. ‘Consort,’
an immune F1 genotype with the pedigree R. nigrum L. ‘Kerry’ × R. ussuriense, was released in 1952, and
has developed neither uredinia nor telia in field or greenhouse inoculation trials.
The objective of this study was
to determine whether resistance in F2 progeny of R. nigrum ‘Ben Lomond’ × ‘Consort’ segregates in a 1:1 ratio.
Following artificial inoculation of single leaf cuttings in a controlled environment, 40 of the 86 F2 genotypes were
susceptible to WPBR; 46 exhibited no signs of the disease.
Chi-square analysis failed to reject the H0 that segregation
of the resistance trait occurred 1:1. The Cr gene was inherited as a simple dominant allele in the F2 generation.
‘Consort’ is heterozygous for the dominant Cr gene.
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