GrainGenes

IV.3 Coordinator's report: Chromosome 6.

K.J. Kasha, Crop Science, University of Guelph. Guelph, Ontario, Canada N1G 2W1.

Based on a review of the literature on linkages with genes, interchanges, trisomics and the previous map (Tsuchiya, 1973), I would suggest the following revised linkage map for chromosome 6.

Orange lemma (o) is very close to the centromere and likely in the long arm.

In addition, ms 6 is located very close to the centromere and the following additional genes have been associated with chromosome 6: smooth awns (r,,e); dense spike (l9); dense spike (ert-e); chlorina seedlings (f6); albino seedlings (alb,, f); piebald and light green seedlings (gene symbol not yet assigned); and curly leaf dwarf (clh.). Crosses to check for allelism between x_n and alb,, f and ert-e and l9 are now being made.

Discrepancies as to the closeness of linkage seem to be common and most genes associated with chromosome 6 are now in crosses that will provide multiple point linkage data. Any linkage data or seed of new mutants associated with chromosome 6 would be greatly appreciated by the coordinator.

Various multiple marker stocks are available as follows:
ms,,bk with gs 4;
ms,,bk with o;
ms 6 with o;
X_n with o;
alb,,f with o;
o with r,, e and 19.

The stocks ms,, bk with gs 4 and x_n with o are probably the best available for covering the present linkage map. Amy 1 would be valuable if it proves to be easy to classify as it is the most distal gene in the long arm at present.

References:

Eslick, R. F., R.T. Ramage, and D.R. Clark. 1974. BGN 4: 11-15.

Konishi, T. 1971. BGN 1: 25-26.

Konishi, T. 1973. BGN 3: 28-31.

Nielsen, G. and 0. Frydenberg. 1974. BGN 4: 53-54.

Rahman, M.M. and R.F. Eslick. 1975. BGN 5: 42-44.

Ramage, R.T. and M. Puluska. 1975. BGN 5: 49-51.

Tsuchiya, T. 1973. BGN 3: 99-103.

BGN 6 toc
BGN Main Index