from Jens Jensen, 9/96
 
 
 Poster presented at the 
 V International Oat Conference
 &
 VII International Barley Genetics Symposium
 Saskatoon, Saskatchewan, Canada, 1996
 
 By Jens Jensen
 Risø National Laboratory
 Environmental Science and Technology Department
 P.O. Box 49
 DK-4000 Roskilde, Denmark
 
 
 Title: Linkage map of barley chromosome 5
 
 Introduction: Traditional markers such as
 isozymes, morphological mutant- and disease
 resistance genes have been mapped before the
 use of molecular markers. A map of chromo-
 some 5 is constructed which contains this infor-
 mation as well as information from the use of
 molecular markers by the method described by
 Jensen (Jensen and Jørgensen, Hereditas 80:
 5-16,1975 and Jensen, Barley Genetics IV:
 927-939,1987).
 
 Results: The estimated chromosome 5 map is
 147 cM long and contains 102 evenly distributed
 loci.
 
 Discussion: The estimated map distances were
 compared to those obtained in previous studies
 using Mapmaker (Graner et al. BGN
 23:53-59,1993) and GMendel (Kasha et al. BGN
 23:65-69,1993); in both cases the map dis-
 tances were longer. In general there was good
 correspondence between the order of loci.
 
 Linkage data from the same molecular maps
 have previously been combined using JoinMap
 (Qi et al., Genome 39:379-394,1996),
 which resulted in similar distances. This is to be
 expected as JoinMap is based on the Jensen
 procedure. Langridge et al. (Molecular Breeding
 1:389-395,1995) also using JoinMap got slightly
 larger distances, but the material was only in
 part the same.
 
 The Jensen procedure gives standard deviations 
 on the estimated map distances and assesses 
 individual linkages; those which deviate more 
 than a chosen level are omitted from the final 
 analysis.