IV. 2. Coordinator's Report. Chromosome 1.
S. E. Ullrich, Department of Agronomy and Soils, Washington State University, Pullman, Washington 99164-6420, U. S. A.
Further evidence for the location of mo5, multi ovary, on chromosome 1 was presented by Tazhin (1982). Linkage between mo5 and n, hulless, was reported with a 3.8% cross-over value.
Two esterase loci, Est3 and Est5 were found to be associated with chromosome 1 by trisomic analysis and subsequently confirmed by wheat-barley addition line analysis (Nielsen, 1982).
Shahla and Tsuchiya (1982, 1983a) have presented evidence with telotrisomic analysis that ac2, albino seedling, is located on the short arm (1S) of chromosome 1. This is contrary to Sogaard's (1977) three point linkage test results that indicated that ac2 is located on 1L. An additional point on this gene is that Wettstein and Kristiansen (1982) reported that act is allelic to alb-m27.
Telotrisomic analysis has indicated that the linked genes br fc and gs3 are located far from the centromere on 1S and that br is distal to the other two genes, fc and gs3 (Shahla and Tsuchiya, 1983b).
Ramage (1983) has presented evidence that seg8K, shrunken endosperm, is located on chromosome 1 by linkage with the break-points of translocations. Further work is being done to determine linkage relations between the various maternal plant monofactorial recessive shrunken endosperm loci and chromosome 1 (segl, seg2, seg4, seg5, seg8).
New aneuploid discoveries show promise as additional tools for genetic analysis of chromosome 1. Additional information has been gained about the length of the acrotrisomic 1L1S (Shahla and Tsuchiya, 1983c) and a new trisomic for a centric fragment has been found (Shim and Tsuchiya, 1983).
Wolfe (1984) has presented an update on the development of multiple dominant and recessive (in coupling) genetic marker stocks for the seven barley chromosomes (Wolfe, 1979; Wolfe and Campbell, 1976). The recessive stock for chromosome 1 includes msg10, br and cer-a*. Other genes available in multiple genetic stocks are wx, n and lk.**
The various new data reported herein do not alter the linkage map of chromosome 1 previously published in BGN 13.
* Allelic to gs3 (Editor).
** This should be lk2 but not lk. The gene lk for the long awn is an
allele of Lk for short awn in chromosome 2 (Editor).
References:
Nielsen, G. 1982. Supplementary and new evidence or the location of five enzyme loci on barley chromosomes. BGN 12:68-69.
Ramage, R. T. 1983. Chromosome location of shrunken endosperm mutants seg6g and seg8k. BGN 13:64-65.
Shahla, A. and T. Tsuchiya. 1983a. Telotrisomic analysis of the gene ac2 (albino seedling) in Triplo 1S in barley. BGN 13:26-27.
Shahla, A. and T. Tsuchiya. 1983b. Additional information on telotrisomic analysis with triple marker stock (br, fc; gs3) on the short arm of chromosome 1. BGN 13:27-28.
Shahla, A. and T. Tsuchiya. 1983c. Additional information of genetic analysis with acrotrisomic 1L1S and triple marker stock f8, lk2, n. BGN 13:28-29.
Shahla, A. and T. Tsuchiya. 1982. Telotrisomic analysis of the gene act (albino seedling) in Triplo 1L in barley. BGN 12:33.
Shim, J. W. and T. Tsuchiya. 1983. Two new types of trisomics in barley. BGN 13:70-71.
Sogaard, B. 1977. The location of eceriferum loci in barley. V. Three point tests of genes on chromosome 1 and 3 in barley. Carlsberg Res. Commun. 42:67-75.
Tazhin, 0. T. 1982. Value of crossing-over between linked genes mo5 and n in barley. BGN 12:18-21.
Wettstein, D. von and K. Kristiansen. 1982. Chloroplast genes: Progress report III on diallelic tests between mapped chloroplast genes and chloroplast genes in stock collections at Copenhagen. BGN 12:93-94.
Wolfe, R. I. 1984. Multiple dominant and recessive genetic marker stock development. Barley Newsletter: in press.
Wolfe, R. I. 1979. Two multiple recessive marker stocks. BGN 9:141.
Wolfe, R. I. and K. W. Campbell. 1976. Multiple dominant and recessive marker stock development. BGN 6:161.