A Database for Triticeae and Avena
XI.1. Location of the lr gene on chromosome 2.
In the "Summary of Linkage Studies in Barley: Supplement I" published
in 1947, Robertson reports that the gene lr for reduced lateral
spikelet appendage is linked with v with O.O percent recombination.
He cites Leonard (1) as the authority for this linkage relationship. In
reviewing Leonard's publication in the Journal of the American Society
of Agronomy, there is no mention made of any v - lr association.
Glinyany (2) crossed the same awnless lateral stock used by Leonard
and obtained fully awned 6-row plants in the F2 as evidenced by a photograph
in his paper. If v and lr were completely linked he could
not have recovered this type plant in the F2.
From linkage data obtained by Leonard (1) and others, lr should
be moved toward the end of the long arm of chromosome 2 from v about
6 to 8 map units.
Fig. 1. Linkage values among 4 genes on chromosome
1. Leonard, W. H. 1942. Jour. Am. Soc. Agron. 34:211-221
2. Glinyany, N. P. 1937. Bul. Appl Bot., Gen., and P1. Brd. 7:355-376.
T. E. Haus
BGN 2 toc
BGN Main Index