期刊
ANNUAL REVIEW OF GENETICS, VOL 48
卷 48, 期 -, 页码 29-47出版社
ANNUAL REVIEWS
DOI: 10.1146/annurev-genet-120213-092509
关键词
recombination; chiasma; poaceae; cereals; chromosome synapsis
资金
- Biotechnology and Biological Sciences Research Council [BB/F019351/1] Funding Source: Medline
- BBSRC [BB/F019351/1] Funding Source: UKRI
Meiotic recombination results in the formation of cytological structures known as chiasmata at the sites of genetic crossovers (COs). The formation of at least one chiasma/CO between homologous chromosome pairs is essential for accurate chromosome segregation at the first meiotic division as well as for generating genetic variation. Although DNA double-strand breaks, which initiate recombination, are widely distributed along the chromosomes, this is not necessarily reflected in the chiasma distribution. In many species there is a tendency for chiasmata to be distributed in favored regions along the chromosomes, whereas in others, such as barley and some other grasses, chiasma localization is extremely pronounced. Localization of chiasma to the distal regions of barley chromosomes restricts the genetic variation available to breeders. Studies reviewed herein are beginning to provide an explanation for chiasma localization in barley. Moreover, they suggest a potential route to manipulating chiasma distribution that could be of value to plant breeders.
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