Cytological analysis of the diploid-like inheritance of newly synthesized allotetraploid wheat

Chromosome Res. 2023 Dec 18;32(1):1. doi: 10.1007/s10577-023-09745-5.ABSTRACTPolyploidization is a process which is related to species hybridization and whole genome duplication. It is widespread among angiosperm evolution and is essential for speciation and diversification. Allopolyploidization is mainly derived from interspecific hybridization and is believed to pose chromosome imbalances and genome instability caused by meiotic irregularity. However, the self-compatible allopolyploid in wild nature is cytogenetically and genetically stable. Whether this stabilization form was achieved in initial generation or a consequence of long term of evolution was largely unknown. Here, we synthesized a series of nascent allotetraploid wheat derived from three diploid genomes of A, S*, and D. The chromosome numbers of the majority of the progeny derived from these newly formed allotetraploid wheat plants were found to be relatively consistent, with each genome containing 14 chromosomes. In meiosis, bivalent was the majority of the chromosome configuration in metaphase I which supports the stable chromosome number inheritance in the nascent allotetraploid. These findings suggest that diploidization occurred in the newly formed synthetic allotetraploid wheat. However, we still detected aneuploids in a proportion of newly formed allotetraploid wheat, and meiosis of these materials present more irregular chromosome behavior than the euploid. We found that centromere pairing and centromere...

Source: Chromosome Research - December 18, 2023 Category: Genetics & Stem Cells Authors: Jing Zhang Chaolan Fan Yang Liu Qinghua Shi Yishuang Sun Yuhong Huang Jing Yuan Fangpu Han Source Type: research