II.38. Allelism of f for chlorina and lg for light green (chlorina) in chromosome 2S in barley.
T. Tsuchiya, Department of Agronomy, Colorado State University, Fort Collins, Colorado 80521, USA.
Three genes for viable yellow seedling mutants (or, lg and f) have been located in the short arm of chromosome 2(2S). The diagnostic trait of orange seedling (or) is different from that in the other two mutants (lg and f) which are very similar to each other. Because of the similarity of the characteristics it was suspected that these two genes could be allelic. All of 22 F1 hybrids from the crosses between these two mutants (f x lg) showed chlorina or light green character similar to the parental stocks. This indicates that lg is allelic to f.
The cross-over values of these "two" genes (lg and f) and some other marker genes on chromosome 2 have been reported as follows:
The cross-over values between f and lg, and y and e are very similar though the cross-over values of f and lg with v differ considerably. The loci of these two genes (f and lg) have been placed far from each other in the map; f was very close to the centromere, while lg was almost half way from centromere to the distal end of the short arm of chromosome 2 (Robertson, 1970). Exact location of the locus for f (=lg) will be determined by the telotrisomic analysis using the multiple marker stocks carrying the f gene in combination with other markers.
References:
Immer, F. R. and M. T. Henderson. 1943. Genetics 28:419-440.
Robertson, D. W. 1970. Barley Genetics II:220-242.
Robertson, D. W. and 0. H. Coleman. 1942. J. Amer. Soc. Agron.34:1028-1034.
Robertson, D. W. et al. 1932. J. Agron. Res. 44:445-466.
Robertson, D. W. et al.1944.J. Amer. Soc. Agron.36:66-72.
