A Database for Triticeae and Avena
A yellow streak mutant, derived from sodium azide treatment, was
selected in an M2 population of 'Glenn' barley (Faue, 1987). Leaves of
plants with this trait were yellow-green with pronounced vertical streaks,
similar to yst2 plants. Maturity of the plants was delayed by one to two
weeks. For this report, the mutant gene is identified as yst,,d. This
yellow streak mutant was tested for allelism with the three known yellow
streak stocks yst (BGS 104), yst2 (BGS 109), and yst3 (Lion) reported to
be inherited independently (Singh and Tsuchiya, 1973). The yst,,d parents
used in the crosses to yst and yst2 were F3 selections from R.I. Wolfe's
Multiple Dominant (MD)/Hector//yst,,d. The yst2 parent was an F2 selection
from the cross OUM5 (lzd)/BGS 109. An F3 selection from
Bowman/3/MD/Hector//yst,,d was crossed to the yst3 stock. Individual
plants used for crossing expressed the appropriate yellow streak trait.
F1 plants from all three crosses were green, F2 progeny rows were
evaluated from the crosses with yst and yst2. Heterogeneity chi-square
values were not significant and progeny rows within a cross were combined.
F2 segregations and values for fit to 9 green : 7 yellow streak ratio are
presented in Table 1. Expression of yst,,d was poor in the F2 progeny from
the yst3 cross. The data indicate that the yst,,d gene is nonallelic to
mutant genes at the three known yellow streak loci. Thus, the allele symbol
yst4d is suggested for the yst,,d gene and yst4 for the locus.
Plants selected from the cross Bowman*3/3/MD/Hector//st,,d have
received three doses of Bowman, a two-rowed cultivar, as recurrent parent.
Yet, most yellow streak segregates had the six-rowed trait of the Glenn
parent. This suggests that yst4d is linked with the v allele found on
Faue, A.C. 1987. Chemical mutagenesis as a breeding tool for barley.
M.S. Thesis, North Dakota State University, Fargo, ND.
Singh, R.J., and T. Tsuchiya. 1973. Allelism testing among three yellow
streak mutants. BGN 3:54-55.