A Database for Triticeae and Avena
The gene for yellow streak 3 (yst3) is a spontaneous mutant gene
found in the variety Lion (Singh and Tsuchiya, 1973) and was described in
detail by Tsuchiya (1984). Primary and telosomic trisomic analyses have
been conducted on seven different chromosomes since 1976. The results are
listed in Table 1.
Primary trisomic analysis (Tsuchiya and Alanko, 1986) suggested that
the gene yst3 may be associated with chromosome 2. However, telotrisomic
analysis for triplo 2L and 2S indicated that the gene yst3 was not
associated with chromosome 2 (Tsuchiya and Hang, 1979). Since deficiency
was found in the telocentric chromosome 2S in some Triplo 2S materials by
Giemsa N-banding (Singh and Tsuchiya, 1982), the telotrisomic analysis for
Triplo 2S was conducted again with Giemsa N-banding technique applied. No
deficiency was found in the telosome 2S in all Triplo 2S tested. The
ratio of F2 segregation confirmed the conclusion by Tsuchiya and Hang
(1979) that yst3 was not associated with chromosome 2.
The ratios of F2 segregations so far obtained suggest that the gene
yst3 cannot be associated with any chromosome except 7. Recent study
concluded that the gene was not associated with the short arm of
chromosome 7. Primary trisomic analysis for Triplo 7 is now underway.
Singh, R.J., and T. Tsuchiya. 1973.BGN 3:54-55.
Singh, R.J., and T. Tsuchiya. 1982. Identification and designation of
telocentric chromosomes in barley by means of Giemsa N-banding
technique. Theor. Appl. Genet. 64:13-24:
Tsuchiya, T. 1984. BGN 14:99.
Tsuchiya, T., and J. Alanko. 1976. BGN 6:84-85.
Tsuchiya, T., and A. Hang. 1979. BGN 9:106-108.
Tsuchiya, T., and A. Shahla. 1982. BGN 12:31-32.