| 春兰(Cymbidium goeringii(Rchb.f)Rchb.f.)的核型研究 |
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| 引用本文： | 隆有庆,傅华龙,苏静娟.春兰(Cymbidium goeringii(Rchb.f)Rchb.f.)的核型研究[J].四川大学学报(自然科学版),2000,37(4). |
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| 作者姓名： | 隆有庆 傅华龙 苏静娟 |
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| 作者单位： | 1. 重庆教育学院生物系，重庆400063
2. 四川大学生物系，成都610064 |
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| 摘 要： | 用改进的染色体标本制片技术 ,报道了春兰 (Cymbidium goeringii (Rchb .f)Rchb .f .)的染色体核型 .研究结果表明 ,春兰体细胞染色体数目 2n =4 0 ,染色体基数x =2 0 .中期染色体中等大小 ,相邻染色体间长度变化不明显 ,染色体相对长度系数组成 (I .R .L .) =2L 2 0M2 14M1 4S .核型公式为 2n =2x =4 0 =2 0m 14sm 4st 2t.主要由中部着丝粒染色体和近中部着丝粒染色体组成 ,未见随体结构 .属于Stebbins核型的 2B型 ,核型不对称系数为 6 4 .2 2 .作者从染色体水平支持春兰在系统演化上归属于较进化的特化种类
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| 关 键 词： | 春兰 核型分析 染色体 |
ITERATIVE SOLUTION FOR m-ACCRETIVE MAPPING EQUATIONS IN BANACH SPACES |
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| LONG You qing ,FU Hua long ,SU Jing juan.ITERATIVE SOLUTION FOR m-ACCRETIVE MAPPING EQUATIONS IN BANACH SPACES[J].Journal of Sichuan University (Natural Science Edition),2000,37(4). |
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| Authors: | LONG You qing FU Hua long SU Jing juan |
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| Institution: | LONG You qing 1,FU Hua long 2,SU Jing juan 2 |
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| Abstract: | The karyotype of Cymbidium goeringii(Rchb.f.)Rchb.f. was investigated by an improved technique. The result shows that the number of the somatic chromosome of Cymbidium goeringii (Rchb.f .) is 2n=40, the basic number of the chtomosome is 20. The index of relative length is 2L 20M 2 14M 1 4S. The karyotype formula is summarized as 2n=2x=40=20m 14sm 4st 2t. The diploid mainly consists of metacentric and submetacentric chromosomes, but not satellites. The karyotype belongs to 2B type of Stebbins karyotypic symmetry. The index of karyotype asynnetry(As.K%)is 64.22. It is held out on the chromosomal characteristics that the Cymbidium goeringii (Rchb.f)Rchb.f ) belongs to more evolrtional and specializational species. |
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| Keywords: | Cymbidium goeringii (Rchb f ) Rchb f karyotype analysis chromosome |
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