A Summary of Linkage Studies in Barley¹

The Inheritance of Fertility in the Lateral Florets of the Four Barley Groups1

“…3• VtVd genotype.-Heterozygous VtVd plants are very much like the two genotypes above and may be considered almost identical with the Vtv type. 4• Vv genotype.-More variations in fertility occur in this genotype than in any of those already described. This heterozygous genotype in the presence of ii is known as a 1ow fertility intermediate.…”

Inheritance of Covered Smut Resistance in Two Barley Crosses1

“…These varieties are 6-rowed, spring types. The plant characters studied together with their gene symbols ( 7) were covered vs. naked qryopsis N n, hooded vs. awned Kk, long-vs: shoot-haired rachilla Ss, resistance vs. susceptibility to stem rust Tt, normal plant stature vs. brachytic Br br, and resistance vs. susceptibility to U. hordei U h u.h. The genetic constitutions were nn, kk, SS, tt, br br, Uh Uh for Brachytic; NN, kk, ss, TT, Br Br, uh uh for Chevron; and NN, KK, ss, tt, Br Br, 11h 11h for Colsess.…”

“…Chevron .... 13.4 72. 7 10.2 * Differences in classifiable plants significant at 5% level. ** Differences in classifiable plants significant at I% level.…”

“…Progenies from plants of normal height or from plants resistant to stem rust produced more c~assifiable plan~s in the smut test. This might be expected smce normal herght and stem rust resistance are linked (7). The cause for these differences is not known unless it is a result of differences in seed size.…”

Inheritance of quantitative traits in inter and intraspecific crosses of barley

“…Barley has been the subject of intensive genetic studies due to its many contrasting traits, its diploid status and low chromosome number (n = 7), its autogamous reproduction, its annual habit, and the ease with which cultivated and some wild forms can be hybridized (Cook, 1962), The literature on inheritance of barley is very extensive, but I will review only those papers that have a direct bearing on the traits involved in my study. Robertson et al (1941Robertson et al ( ,1947, Smith (1951), and Nilan Griffee (1925) found that maturity was controlled by a single factor pair and earliness was dominant. Maturity was strongly linked to a locus that controlled reaction to Helminthosporium sativum.…”