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- Title
Evolution of Maize Landraces in Southwestern China: Evidence from B Chromosomes.
- Authors
Fa-Bo Chen; Qi-Lun Yao; Shi-Ping Huo; Hong-Fang Liu
- Abstract
To explore the evolution of maize landraces in Southwestern China, 30 maize landrace populations were examined to characterize the B chromosomes (Bs). Eighteen populations displayed numerical polymorphisms and a total of 487 Bs were identified. The number of Bs per individual varied from 0 to 2, especially 0 and 1. The percentage of individuals possessing Bs within populations ranged from 0 to 90%. Three types of B chromosomes were identified: a subtelocentric B (BST), a metacentric B chromosome (BT) and a small B minichromosome (BM). The C-banding of BST and BT was highly heterochromatic and easily distinguished from A chromosomes (As) following the conventional C-banding methodology, whereas heterochromatin can be observed in a more condensed or dispersed state along both Bs and As. The number of Cbands in the As and numerical B polymorphisms were associated. The mean C-band number varied from 11.0 to 20.6 in the 0B class, 10.8-18.6 in the 1B class and 10.5-18.6 in the 2B class, showing a negative trend between the B chromosome and C-band number. Higher frequencies of B chromosomes, plants with Bs, and all three B chromosome variants were detected in Sichuan landrace populations, thus Sichuan is likely the origin of landraces in southwest China.
- Subjects
CHROMOSOMES; CORN genetics; MINICHROMOSOME maintenance proteins; GENETIC polymorphisms; HETEROCHROMATIN
- Publication
International Journal of Agriculture & Biology, 2017, Vol 19, Issue 3, p453
- ISSN
1560-8530
- Publication type
Article
- DOI
10.17957/IJAB/15.0300