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   着丝点 在 农作物 分类中 的翻译结果: 查询用时:0.027秒
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  centromere
The results were validated by using fluorescent in situ hybridization (FISH) analysis with centromere-specific DNA probes.
      
Computer-aided analysis of the amplified in TAIL-RCR DNA region adjacent to the left border of the insertion revealed a putative site of T-DNA insertion, the 2.5-kb At2g09920 gene located in the long arm of chromosome 2, near the centromere.
      
If the mating-type locus is linked to the centromere, the genome regions adjoining the centromeres of all chromosomes remain heterozygous.
      
Genetic regulation of the centromere division in rye and wheat univalent chromosomes in dimonosomics during the meiotic anaphase
      
The data obtained demonstrate that the rye and wheat chromosomes studied are involved in genetic regulation of centromere division in meiotic anaphase I (AI).
      
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  kinetochores
Owing to chiasmata, homologous chromosomes participate in meiosis I in pairs rather than individually, which, along with unipolarity of kinetochores (only in meiosis 1), ensures segregation of homologous chromosomes.
      
Mitotic chromosome segregation is partly achieved by interaction between microtubules (MTs)and the kinetochores of sister chromatids.
      
The precise mechanism of the interaction between kinetochores and MTs remains unclear.
      
These defects seem to be related to the disruption of functioning of mitotic spindle microtubules and (or) their defective attachment to the appropriate kinetochores.
      
On the contrary, kinetochores on chromosomes assembled according to the second protocol closely resemble those in somatic cells.
      
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In this study slides were prepared by smear method with pretreat-ment of low temperature(0°-3℃),KCI,enzyme,flamedrying and diffe-rential stained with Giemsa technique for demonstrating the somatic chro-mosome of root tip of the Chinese rye‘Gansu’and Canadian rye‘Ku-stro’.The karyotype was analysed by means of morphological compari-son and banding pattern of individual chromosomes of the rye genom.There are no significant differences between the chromosome sets of thetwo varieties studied.Both of them show prominent...

In this study slides were prepared by smear method with pretreat-ment of low temperature(0°-3℃),KCI,enzyme,flamedrying and diffe-rential stained with Giemsa technique for demonstrating the somatic chro-mosome of root tip of the Chinese rye‘Gansu’and Canadian rye‘Ku-stro’.The karyotype was analysed by means of morphological compari-son and banding pattern of individual chromosomes of the rye genom.There are no significant differences between the chromosome sets of thetwo varieties studied.Both of them show prominent C-bands on telo-mere and satellite regions and fainter bands on centromere regions.How-ever,the intercalary bands show more variation.The seven pairs ofchromosomes of rye genom are classified into 3 groups,namely,3 me-tacentric,3 submetacentric and 1 satellited chromosomes.

本试验用涂片法制片,以低渗、酶解、火焰干燥以及分带等处理我国“甘肃黑麦”和加拿大黑麦“Kustro”的根尖细胞。从形态、C 带带型分析和比较了其染色体组型。两个品种无显著差异。其染色体的端粒带、核仁缢痕带都显著而较稳定。着丝点带也常出现。中间带变化较大。所有染色体分为三组:中部着丝点染色体;亚中部着丝点染色体;随体染色体。

Chinese Dong Xiang wild rice is perennial, rhizomatous and its growth habits are classified into erect and spreading type. Genie differentiation was found in the wild population. Analysis on the morphological characters of Dong Xiang wild rice suggests that this wild rice be the ecogeographie race of Oryza sativa var. spontanea. Cytologi-cal observation on the root tips confirms that the chromosome number of it is 2n=24. Chromosomal behavior of PMC at meiosis is normal. Pachytene analysis revealed that this...

Chinese Dong Xiang wild rice is perennial, rhizomatous and its growth habits are classified into erect and spreading type. Genie differentiation was found in the wild population. Analysis on the morphological characters of Dong Xiang wild rice suggests that this wild rice be the ecogeographie race of Oryza sativa var. spontanea. Cytologi-cal observation on the root tips confirms that the chromosome number of it is 2n=24. Chromosomal behavior of PMC at meiosis is normal. Pachytene analysis revealed that this wild rice possess 3 median, 8 submedian and 1 subtelocentric chromosomes. Chromosome Ⅷ attaches the nuclear body. The absolute length of chromosome complement ranges from 64.4 to 18.7 μ. Pollen fertility and chromosome pairing are normal when it crossed with cultivated varieties. Genome of it may be AA.

中国东乡野生稻具多年宿根性,生长习性分直立型和匍匐型二类,群体内已有基因分化。形态性状分析证明其为普通野生稻的生态型变种。根尖细胞学鉴定,其染色体数为2n=24。花粉母细胞减数分裂行为正常。粗线期分析证实:该种具3个中部着丝点染色体,8个次中部着丝点染色体及一个亚端部着丝点染色体。染色体ⅤⅢ与核仁相连。染色体绝对长度为64.4—18.7μ。与栽培稻杂交育性正常,染色体配对良好,染色体组型可能为AA。

A new method for preparing mitotic chromosomes is used for thekaryotype analysis of root tip cells of Triticum amyleum L.It was foundthat T.amyleum possesses a diploid chromosome number of 14(2n=14).All chromosomes were matched into 7 homologous pairs which are meta-centric and submetacentric.According to the size,shape and position ofthe centromere,these 14 chromosomes were tentatively classified into 3groups.No satellites were found on any of these chromosomes.Meantime,Giemsa C—banding technique was used in...

A new method for preparing mitotic chromosomes is used for thekaryotype analysis of root tip cells of Triticum amyleum L.It was foundthat T.amyleum possesses a diploid chromosome number of 14(2n=14).All chromosomes were matched into 7 homologous pairs which are meta-centric and submetacentric.According to the size,shape and position ofthe centromere,these 14 chromosomes were tentatively classified into 3groups.No satellites were found on any of these chromosomes.Meantime,Giemsa C—banding technique was used in the analysis ofchromosome banding pattern in this wild diploid wheat.

利用植物有丝分裂染色体标本制作的新方法进行野生一粒小麦根尖细胞染色体组型的分析,初步结果如下:其二倍体数为14个(2n=14),全部染色体可配成7对同源染色体,均为中部或亚中部着丝点染色体,根据其大小,形状和着丝点位置可分为三组。并没有发现任何一个染色体的长臂和短臂上带有随体。同时还用 Giemsa 分带技术进行了染色体的带型分析。

 
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