Abstract:
Three locally produced cultivars of hexaploid Triticale were investigated cytologically for partial asynapsis and occurrence of univalents at metaphase I during their meiosis. The percent PMCs exhibiting partial asynapsis was 15.80, 32.61 and 79.82 and the corresponding mean univalent per PMC was calculated to be 0.38, 1.17 and 1.24 in NIAB-T-158-4, NIAB-T-103 and NIAB-T-77 respectively. The incidence of partial asynapsis and univalents seems to be due to the difference in the 4C nuclear contents and consequently the time taken for meiosis by rye and wheat genomes taking part in the synthesis of Triticale. It is also likely that rye contributes towards the formation of univalents because the chromosomes of this genus are under stress as an inbreeder. The results are discussed in relation to the implications of such abnormal meiosis during commercial breeding of Triticale.
Page(s):
87-96
DOI:
DOI not available
Published:
Journal: Biologia, Volume: 27, Issue: 1, Year: 1981