BGN 12: Chromosome constitutions in the progenies of haploid initiator mutant, hap/hap homozygote in barley BARLEY GENETICS NEWSLETTER, VOL. 12, II. RESEARCH NOTES
Tsuchiya & Shahla, p. 34

II. 14. Chromosome constitutions in the progenies of haploid initiator mutant, hap/hap homozygote in barley. (1, 2)

T. Tsuchiya and A. Shahla, Department of Agronomy, Colorado State University, Fort Collins, Colorado 80523, U.S.A.

(1) Supported by USDA/SEA Competitive Research Grant 59-2081-1-1-681-0 to Tsuchiya.

(2) The authors acknowledge the receipt of seeds of haploid initiator mutant with thanks to Dr. A. Hagberg, Svalof, Sweden.

Seeds of hap/hap homozygotes (Hagberg and Hagberg, 1981) were provided by A. Hagberg of Sweden. Six seeds were germinated with the following results: Four plants had 2n = 14 chromosomes and grew normally, one plant showed 2n = 13 + 1 acrocentric chromosome and did not grow beyond the coleoptile stage, and one plant was 2n = 14 - 7 twin and both survived. These results suggest possible origins of haploids by twin seeding and/or fragmentation and elimination of a part or entire genome in this mutant although more extensive and intensive analyses are needed to find a real mechanism on the origin of haploids in this barley mutant.

Crosses were made between hap/hap and Shin Ebisu 16 (SE 16) diploid to transfer this gene to SE 16 background. All 12 seeds from this cross showed 2n = 14 chromosomes.

Reference:

Hagberg, G. and A. Hagberg. 1981. Haploidy initiator gene in barley. Abstract of the Fourth International Barley Genetics Symposium, Edinburgh, Scotland, UK, July 22-29, 1981, p. 135.

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