Two short-awned, two awnless and two blue aleurone EMS-induced mutants of barley were allele-tested within mutant type by Ahuja and Sethi (1987a) . The mutant pairs of each type were allelic with each other as the mutant character was expressed in the F1 generation with no segregation in the F2 and F3 generations. The report did not indicate that the mutants were allele-tested against known genetic stocks for the respective genes. One or more of these mutant genes could be allelic with known chromosome 1 genes.
Ahuja and Sethi (1987b) also reported on allele tests among three chemical ly- induced hulless mutants from the hulled variety 'HBL 110' and the hulless cultivar 'Dolma'. The induced mutants appeared to be allelic to one another. Whereas one of the induced mutants, Mt2 × Dolma cross yielded all hulless F1 plants, the F2 segregated 61 hulless: 19 hulled plants. The authors hypothesized a two gene dominant-recessive epistatic system. The authors did not report any crosses with known marker gene stocks nor with hulled types. All previous reports of hulless mutants or genes (n on chromosome 1) have had single recessive gene inheritance. Timian and Franckowiak (1987) have located a newly described barley stripe mosaic virus (BSMV) resistance gene on chromosome 1. They have suggested this gene be designated rsmx. The gene is apparently different from previously reported BSMV resistance genes which have lacked association with chromosome 1 (Sisler and Timian, 1956; Vasquez et al. , 1974; Carroll et al. , 1979) . Timian and Franckowiak (1987) found chromosome 1 recombination percentages between rsm and lk2 (shortawn) of 30.2 ++ 4.0 and 28.2 + 3.1 from two crosses and between rsm and n (hulless) of 24.3 + 3.0.
A gene encoding a barley grain protein with chitinase activity was located on chromosome 1 by using wheat-barley addition lines and immunoblotting with a monospecific antibody (Hejgaard and Bjorn, 1987). The authors suggested the gene symbol Chi1.
Nine of 29 new 60 Co gamma radiation-induced reciprocal translocation lines involve chromosome 1 as determined by crossing with Ramage's translocation tester set (Makino, 1987).
Shahla and Tsuchiya (1987) described the use of telotrisomic and acrotrisomic cytogenetic tools for genetic analysis (chromosome location and mapping) and compared their use with conventional marker gene methods. Telotrisomics Triplo 1S and 1L and the acrotrisomiC 10 were used with eight chromosome 1 marker genes, f5, br, fc , gs3, ac2, f8 (on 1S) and 1k2 and n (on 1L) . Chromosome location was confirmed with the trisomic in this study, and gene order was redescribed based on the trisomic analysis for gs3, fc, and br. The cytological behavior, morphological characteristics, fertility and transmission of the acrotrisomic 1L1S was described.
References
Ahuja, S. and G. Sethi. 1987a. Allelic relationships of genes for short-awned, awnless and blue aleurone characters in barley (Hordeum vulgare L.). BGN 17:55-57.
Ahuja, S. and G. Sethi. 1987b. Allelic relationships of genes for naked caryopsis mutants in barley (Hordeum vulgare L.) BGN 17:58-62.
Carroll, T. W., P. L. Gossel and E. A. Hockett. 1979. In- heritance of resistance to seed transmission of barley stripe mosaic virus in barley. Phytopathology 69:431- 433.
Hejgaard, J. and S. Bjorn. 1987. Chitinase locus (Chil) assigned to barley chromosome 1 (7H) by immunoblotting. BGN 17:92-93.
Makino, T. 1987. Chromosome identification of newly induced reciprocal translocation lines by gamma-ray irradiation. BGN 17:53-54.
Shahla, A. and T. Tsuchiya. 1987. Cytogenetic studies in barley chromosomes 1 by means of telotrisomic, acrotrisomic and conventional analysis. Theor. Appl. Genet. 75:5-12.
Sisler, W. W. and R. G. Timian. 1956. Inheritance of barley stripe mosaic resistance of Modjo (C. 1. 32312) and C. 1. 3212-1. Plant Dis. Rep. 40:1106-1107.
Timian, R. G. and J. D. Franckowiak. 1987. Location of a factor for barley stripe mosaic virus reaction on chromosome 1. BGN 17:79-82.
Vasquez, G. G., G. A. Peterson, and R. G. Timian. 1974. In- heritance of barley stripe mosaic reaction in crosses among three barley varieties.Crop Sci. 14:429-432.