IV.1 Translocations and balanced tertiary trisomics.
There are 220 translocations in the World Collection. They are listed in Table 1. In this table the headings "Break-positions," S = short arm, L = long arm, Sat = satellite and Cen = centromere are used. The symbol alone means that the break-position is definitely established; the symbol followed by a question mark means that the break-position is probably in that position; the symbol - means that the translocation has been examined and no discernible difference was found; absence of all symbols means that the translocation has not been examined for break-position.
There are 10 balanced tertiary trisomics (BTT') in the World Collection. They are listed in Table 2. The extra chromosome of a BTT is symbolized by a capital letter T to designate a translocated chromosome, followed by the number of the chromosome furnishing the centromere-bearing segment, followed by the number of the chromosome furnishing the translocated segment, followed by the letter representing the particular translocation from which the chromosome was derived. As an example, the BTT 16c se2 has an extra chromosome designated T16c which is a translocated chromosome with a centromere-bearing segment of chromosome 1 combined with a translocated segment of chromosome 6 derived from the translocation T1-6c.
Limited amounts of seed of the translocations and balanced tertiary trisomics are available upon request from R. T. Ramage, Agronomy Department, University of Arizona, Tucson, Arizona 85721, U.S.A.
Table 1. Translocations in the World Collection.
(page 74)
Table 1. Translocations in the World Collection.
(page 75)
Table 1. Translocations in the World Collection.
(page 76)
Table 1. Translocations in the World Collection.
(page 77)
Table 1. Translocations in the World Collection.
(page 78)
Table 1. Translocations in the World Collection.
(page 79)
* Authority.
1. Ramage, R. T., C. R. Burnham and A. Hagberg. A summary of translocation
studies in barley. Crop Science 1:277-279. 1961.
2. Ramage, R. T. and L. C. Lehmann. Cytogenetic studies of barley.
Barley Newsletter 8:8-9. 1964.
3. Lehmann, L. C. and R. T. Ramage. New barley translocations. Barley
Newsletter 9:29. 1965.
4. Hagberg, A. Personal communication dated April 3, 1967.
5. Ramage, R. T. and W. H. Powell. New barley translocations. Barley
Newsletter 4:5. 1960.
6. Larter, E. N. Personal communication dated April 1, 1963.
Table 2. Balanced Tertiary Trisomics in the World
Collection
* Authority.
1. Jarvi, A. J. Shrunken endosperm mutants in barley, Hordeum
vulgare L. Ph. D. Thesis. Montana State University. 1970
2. Ramage, R. T. The trisomics of barley. Ph. D. Thesis. University
of Minnesota. 1955.
3. Ramage, R. T. and N. A. Tuleen. Balanced tertiary trisomics in barley
serve as a pollen source homogeneous for a recessive lethal gene. Crop
Science 4:81-82. 1964.
