A Database for Triticeae and Avena
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
(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.
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.
BGN 12 toc
BGN Main Index