II.9. Locating a six-rowed gene v5 on chromosome 4 in barley.

T. Fukuyama, The Ohara Institute for Agricultural Biology, Okayama University, Kurashiki, Okayama, Japan.

A six-rowed mutant strain 38X-197 was induced from a two-rowed variety Gamma 4 by X-ray irradiation and kindly provided by Mr. S. Hirari, Kirin Brewery Co., Tokyo, Japan. As reported in BGN 5, six-rowed character of the mutant was controlled by a single recessive gene v5 located on chromosome 4, where v5 was linked with gene K for hooded lemma appendage with 16.2% recombination. In order to locate v5 on chromosome 4, a three-point test was performed using a cross with a two-rowed tester stock having four marker genes, K, gl3, f9 and Hs.

Table 1. F2 and F3 data for linkage of v5 for six-rowed head and four markers K, gl3, f9 and Hs in a cross between 38X-197 and two-rowed tester stock K-gl3-f9.

Figure l. A map of five genes on chromosome 4.

The genetic data for F2 and F3 segregations and a map of chromosome 4 are given in Table 1 and Figure 1. These results apparently indicate that the location of gene v5 is between K and f9, probably very close to I alleles.

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