II. 54 Trisomic analysis of three mutant genes in barley.*
T. Tsuchiya, S.D. Tanksley** and R. Ward**. Department of Agronomy, Colorado State University, Fort Collins, Colorado 80523, U.S.A.
*Partly supported by NSF Research Grant GB30493 and GB30493 #A1. **Undergraduate student in Department of Agronomy. Work was conducted as a part of training in the course Special Studies in Genetics (AG 495C).
Trisomic analysis was applied to study the association of the following three mutant genes with chromosomes:
1. yst3: yellow streaked mutant which was also used in the other experiment (Tsuchiya and Alanko, BGN 6: 84-85).
2. ov1: ovuleless or male mutant induced by radiation (Tsuchiya and Alanko, BGN 6: 84-85).
3. Angustifolia: narrow leaved, incomplete dominance. Homozygotes for mutant gene is a type of lethal and does not grow beyond 2-3 leaf stage.
Five trisomic stocks (Triplo 1,3,4,5 and 6) of Shin Ebisu 16 (SE 16) obtained by Tsuchiya (1967) were used as female parent in crosses with the mutant stocks. Cross combinations and F2 segregations are shown in Table 1.
Table 1. Cross combinations and F2 segregations in trisomics x mutant stocks.
The results are summarized as follows: 1. yst3 is not associated with chromosome 1 (see Tsuchiya and Alanko, 1976). 2. male or ovuleless gene (ov1) is associated with chromosome 4 (see Tsuchiya and Alanko, BGN 6: 84-85). 3. the gene controlling Angustifolia mutant seems to be associated with chromosome 5, though more data is needed to verify this result.
