A Database for Triticeae and Avena
II.42. Cytological identification of a translocation accompanied
by a gene mutation.
T. Tsuchiya. Department of Agronomy Colorado State University, Fort
Collins, Colorado 80521, U.S.A.
*Reports II.33. (p.80) through II.42. (p.108) by T. Tsuchiya and co-workers
are based on the results of researches supported by NSF Research Grants
GB4482X and GB30493 and Colorado State University Experiment Station Project
Supported in part by a Research Grant from Faculty Improvement Committee
(FIC), Colorado State University, No. 13-2018-0550.
KM (K mut) 21b is a radiation-induced "male" (or ovary-less) mutant
which was accompanied by a reciprocal translocation in X3 when
this mutant was first found (Tsuchiya, 1962, 1969). At diakinesis the quadrivalent
was associated with the nucleolus in the mutant plant. It has therefore
been known that one of the translocated chromosomes is chromosome 6. The
new translocation is designated at RT x-6. Crosses were made between
plants homozygous for RT x-6 and five previously established translocation
stocks. Meiotic configurations of F1 hybrids were studied with the results
shown in Table 1.
Table 1. Chromosome configurations at Metaphase
I of meiosis in F1 hybrids between RT x-6 translocation and five
known translocation stocks.
From the results obtained, the unknown chromosome (x) involved in this
new translocation (RT x-6) was determined to be chromosome 4. The
new translocation is designated T-4-6i by R. T. Ramage, the Coordinator
for Translocation Stocks (BGN 2:135-137).
Detailed karyotype analysis showed that the long arm of chromosome 6
is shorter than the normal one and one arm of chromosome 4 is longer than
normal. It was, however, not possible to determine which arm of chromosome
4 is involved in this translocation.
BGN 2 toc
BGN Main Index