摘要
报道了鹅观草属（ Ｒｏｅｇｎｅｒｉａ Ｃ．Ｋｏｃｈ）４ 个种的核型，即中华鹅观草，核型为２ｎ ＝ ４ｘ ＝ ２８ ＝ ２８ｍ（２ＳＡＴ）；裸穗鹅观草，核型为２ｎ ＝ ４ｘ ＝ ２８ ＝ ２４ｍ ＋ ４ｓｍ（２ＳＡＴ）；缘毛鹅观草，核型为２ｎ＝４ｘ＝２８＝２２ｍ ＋６ｓｍ（２ＳＡＴ）；缘穗鹅观草，核型为２ｎ＝４ｘ＝ ２８＝２４ｍ（２ＳＡＴ） ＋ ４ｓｍ 。４ 个种核型的共征和自征反映了形态划分中共属分种的合理性。尤其通过核型不对称性和相对进化程度的分析，表明中华鹅观草最原始，缘穗鹅观草最进化，裸穗鹅观草和缘毛鹅观草演化居中；狭颖草系高级于缘毛草系。核型不对称性所表示的进化程度似乎与系间颖芒的发生，种间花序的增长变粗。
The karyotypes of 4 species of Roegneria C. Koch are reported in this paper. The karyotypic formulae are as follows: R. sinica Keng, 2n=4x=28=28m(2SAT); R. nudiuscula L. B. Cai, 2n=4x=28=24m+4sm(2SAT); R. pendulina Nevski, 2n=4x=28=22m+6sm(2SAT); R. viridula Keng et S. L. Chen, 2n=4x=28=24m(2SAT)+4sm. The public and respective features of karyotypes of 4 species reflect the rationality of dividing species and coexisting in a genus in the morphological classification. Especially through the analyses of the karyotypic asymmetry and relative evolutive level, authors think that R. sinica Keng is the most primitive among the 4 species, R. viridula Keng et S. L. Chen is the most evolutive among them, while R. nudiuscula L. B. Cai and R. pendulina Nevski are intermediate in evolution; the Ser. Angustiglumes Nevski is more advanced than the Ser. pendulinae Nevski. The evolutive level shown by karyotypic asymmetry is related to the occurrence of the awn on glume among series, the elongation and thickening of the spike among species and the elongation of the awn on lemma among them.
出处
《植物研究》
CAS
CSCD
北大核心
1999年第3期268-272,共5页
Bulletin of Botanical Research
基金
国家自然科学基金
中国科学院生物分类区系学科发展特别支持费资助
关键词
鹅观草属
核型分析
进化
Roegneria
Karyotype analysis
Evolution
