Inst. of Genetics
Univ. of Copenhagen
Oster Farimagsgade 2A
DK-1353 Copenhagen K, Denmark
Vol. 18 The map of chromosome 4 presented at the Barley Genetics Symposium in Okayma, Japan 1986 assigns cer-j (g13) to position 0 and cer-cqu (gs1) to position -14.5 + 5.8 cM (Jensen). The latter is-based on results from the crosses gS1 × K (McProud) and gs1 × z (Albrechtsen) in which 42.2 + 4.7 and 23.9 + 4.1% recombination were obtained. By the map estimation procedure Jensen converted these to 30.4 + 3.7 and 26.7 + 4.1, respectively. On the other hand Immer and Henderson had previously concluded that gs1 and K are independently inherited. Because of the relatively high S.D.s in the above estimates, cer-cqu (gs1) was not assigned its numerical position in a recent evaluation of the present state of map construction in barley, but was instead placed in the general region (Søgaard and von Wettstein-Knowles). The latter is now open to question because of subsequently obtained results. As shown in Table I the two markers appear to be inherited independently although both are located on chromosome 4 (see Søgaard and von Wettstein-Knowles, 1987). Therefore, until additional information is available cer- cqu (gs1) should be preferably omitted from chromosome 4 maps.
References:
Albrechtsen, R. S. 1957. Hood elevation and awn length inheritance studied in barley. M. So. Thesis, Utah State Agricultural College, pp. 1-74.
Immer, F. R. and Henderson, M. T. 1943. Linkage studies in barley. Genetics 28:419-440.
Jensen, J. (in press). L inkage map of barley chromosome 4. In: Barley Genetics V. Proc. Fifth Int. Barley Symp. Okayama, Japan 1986.
McProud, W. L. 1971. Genetics, phenotypes, agronomic and malting performance of glossy sheath mutants in barley, Hordeum vulgare L. University, pp. 1-72. Ph.D. Thesis, Montana State
Søgaard, B. and Wettstein-Knowles, P. von. 1987. Barley: genes and chromosomes. Carlsberg Res. Commun. 52: 123-196.