BARLEY GENETICS NEWSLETTER

Volume 10 

April 10, 1980

Table of Contents

EDITORIAL COMMITTEE
T. E. Haus, Colorado
R. T. Ramage, Arizona
T. Tsuchiya, Colorado
Department of Agronomy
Colorado State University
Fort Collins, Colorado 80523, USA

 
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This Newsletter consists of informal reports which are presented to further the exchange of ideas and information between research workers. Consequently responsibility for statements rests with the authors. Before quoting any statements, the author involved should be contacted.
FRONT COVER DIAGRAM

Telotrisomics have been useful in locating the centromere position in the linkage maps and associating genes with chromosome arms in barley. Triplo 5L, the telotrisomic for the long arm of chromosome 5 (5L) was the first telotrisomic cytologically established by karyotype analysis (Tsuchiya, 1972a, BGN 2:90-92; Tsuchiya, 1972b, J. Hered. 63:373-375). The genetic data from telotrisomic analysis (Fedak, 1969, Ph.D. Thesis; Fedak et al, 1972, Can. J. Genet. Cytol. 14:949-957; Tsuchiya, 1972, BGN 2:93-98; Tsuchiya and Singh, 1973, BGN 3:75-78) in combination with the cytological data resulted in a reversal of the linkage map of chromosome 5; the previous long and short arm became the short and long arm, respectively (Tsuchiya, 1972a,b). As a result of this revision, it was also found that almost all of the resistant genes for powdery mildew are located in the short arm of chromosome 5 (Jensen, 1980, BGN 10:88-100).

Figure 1 shows karyotype of two complete cells at somatic metaphase.

Figure 2 shows the previous (a) and the revised map (b) of chromosome 5 in barley.