IV.4 Coordinator's report: Chromosome 7.
George Fedak. O.R.S., Central Experimental Farm, Ottawa, Ont. KLA OC6 Canada.
The marker cud (curly dwarf with compact head) was assigned to chromosome 7 (Takahashi et al. 1975). This mutant was induced by E.M.S. treatment of an uzu type cultivar.
In their studies with translocation T2-7a Ramage and Eslick (1975) have listed a number of male sterile genes that are linked to the T27a breakpoint and therefore should be located on either chromosome 2 or 7. These are genes msg2, msg,,f and msg,,be that are very closely linked and genes msg9, msg16 and msg, cw that are linked with the breakpoint.
A second cycle of crossing is currently underway between markers reported to be located on chromosome 7 in order to establishing multiple linkage stocks to use in establishing a linkage map for that chromosome.
Several hundred seeds of primary trisomic Semierect were screened cytologically in hopes of finding some spontaneously occurring telos for chromosome 7 but to date none have been found.
References:
Ramage, R T. and Eslick, R.F. 1975, Translocation linkage tests T2-7a x male sterile genes. BGN 5: 46-48.
Takahashi, R., Hayashi, J., Konishi, T. and Moriya, I. 1975. Linkage analysis of barley mutants. BGN 5: 56-60.