Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8892255 | Horticultural Plant Journal | 2016 | 5 Pages |
Abstract
For studying species origin, systematic evolution and phylogenetic relationship of Gazania rigens, four different G. rigens varieties, with different flower colors, were subjected to chromosome karyotype analysis. The somatic chromosome number in three varieties 'Hongwen', 'Xingbai' and 'Richu' was 2nâ=â10, while in 'Zhongguo Xunzhangju' it was 2nâ=â20. We speculate that the cardinal number of chromosomes in G. rigens plants is xâ=â5, in which case 'Zhongguo Xunzhangju' is a tetraploid. The karyotype formulae of 'Hongwen', 'Xingbai' and 'Richu' were 2nâ=â8mâ+â2sm, 2nâ=â8mââ+â2sm and 2nâ=â10m respectively. The karyotype formula of 'Zhongguo Xunzhangju' was 2nâ=â18mâ+ 2sm. The asymmetrical karyotype coefficients of the four G. rigens varieties ranged from 53.80% to 58.84%. Only 'Richu' had a '1A' karyotype, while the others were relatively symmetric '2A'. Karyotype analysis indicates that the three introduced varieties have a close genetic relationship.
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Authors
Zeng Jiashi, Wang Dongxu, Wu Yangqing, Guo Xiaoyu, Zhang Yazhou, Lu Xiaoping,