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1.
通过染色体配对分析和荧光原位杂交对八倍体小冰麦中2的染色体组构成进行分析,结果表明:八倍体小冰麦中2含有的冰草染色体是来自天蓝冰草(Agropyronintermedium(Host)P.b.=Elytrigiaintermedia(Host)Nevski=Thinopyrunintermedium(Host)bARKWORHandDewey)具同亲关系的染色体组,但冰草的这种同亲关系的染色体组不  相似文献   

2.
八倍体小冰麦中冰草染色体组的同工酶研究   总被引:2,自引:0,他引:2  
  相似文献   

3.
八倍体小偃麦染色体组分析   总被引:9,自引:0,他引:9  
钟冠昌  张学勇 《遗传学报》1991,18(4):339-343
本文对普通小麦与长穗偃麦草(Elytrigia elongata=Agropyron elongatum.2n=70)杂交选育出来的5个八倍体小偃麦的染色体组进行了研究。通过八倍体小偃麦与普通小麦杂交,八倍体小偃麦相互间杂交,观察了杂种F_1花粉母细胞减数分裂行为。根据观察结果,讨论了长穗偃麦草染色体组的构成,认为长穗偃麦草的染色体组为E_1E_2F_2F_2N较为合适。在此基础上,确定了5个八倍体小偃麦的染色体组:7430为ABDE_1,68为ABDF_1,693为ABDF_1,7631为ABDF_2,784为ABDN。另外,还讨论了八倍体小偃麦染色组的重组问题。  相似文献   

4.
对常规染色体的观察结果表明:原初的小冰麦异附加系TAI14为2n=44,其中所有的染色体都是中部或近中部着丝点染色体。但在其后代中发现有一对染色体变成了端着丝点染色体。为判明变异的染色体是冰草还是小麦的染色体,用荧光原位杂交技术进行了检测,结果表明,TAI14中的所有小麦染色体都显示红色荧光,只有一对端着丝点染色体显示绿色荧光,说明变异的是冰草染色体,即:小冰麦异附加系TAI14原为二体异附加系,现变成了双端体异附加系。对变异发生的原因和双端体异附加系的用途进行了讨论。  相似文献   

5.
6.
八倍体小滨麦染色体组构成的分子细胞遗传学研究   总被引:1,自引:0,他引:1  
应用基因组荧光原位杂交技术对6种类型的八倍体小滨麦(octoploid Tritileymus)的染色体结构成进行了分子细胞遗传学分析。结果表明,6种八倍体小滨麦的体细胞染色体数目均为2n=56。用滨麦(Leymus mollis (T rin.) Hata)(染色体组为JJNN)DNA作控针进行原位杂 时,M842-4、M842-8、M842-12、M842-13和M842-16等5种类型八倍体  相似文献   

7.
天兰冰草及八倍体小冰麦染色体组构成研究   总被引:11,自引:0,他引:11  
韩方普 《遗传》1994,16(5):31-34
通过天兰冰草、小瞒与天募冰草杂种F:体细胞N带分析,天兰冰草染色体不显示小麦B组染色体的特征带纹.分析6个由普通小麦与天兰冰草杂交衍生而来的八倍体小冰麦染色体组构成,八倍体小冰麦中1、中2、苏联多年生染色休组为ABIDE1、或ABDE2、中3、中4、中5染色体组构成为ABDX.观察小麦与夭兰冰草杂种F1及部分组合回交一代减数分裂中期I染色体配对情况,综合分析所得实验结果,我们认为,天兰冰草不含小麦的B组或修饰的B组染色体,而含有两组远同源染色体(distanthomologous),建议将天兰冰草染色体组型定为XE1E2.  相似文献   

8.
对常规染色体的观察结果表明:原初的小麦异附加系TAI-14为2n=44,其中所有的染色体都是中部或近中部着丝点染色体。但在期后代中发现有一对染色体变成了端着染色体。为判明变异的染色体是冰草还是小麦的染色体,用荧光原位杂交技术进行了检测,结果表明,TAI-14中的所有小麦染色体都显示红色荧光,中有一对端着丝点染色体显示绿色荧光,说明变异的是冰草染色体,即:小冰麦异附加系TAI-14原为二体异附加系,  相似文献   

9.
10.
常规染色体观察表明 :原初的小冰麦异附加系TAI 2 7为 2n =44,其中所有的染色体都是中部或近中着丝点染色体 .但后来发现有 2种植株形态不同的后代均有 1对染色体变成小染色体 .经用荧光原位杂交技术 (fluorescenceinsituhybridiza tion ,FISH)检测发现 ,一种变异类型的 1对小染色体是来自冰草 ,另一种变异类型除变异的 1对小染色体来自冰草 ,还有 1对冰草染色体代换了小麦染色体形成异附加代换系 .TAI -2 7及其变异类型均表现高抗大麦黄矮病 (barleyyellowdwarfvirus ,BYDV) .对这种变异发生的原因及变异类型的用途做了简短讨论  相似文献   

11.
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Genomic constitution of octoploid wheat-wheatgrass amphiploid Zhong 2 was analyzed by chromosome pairing and fluorescence in sim hybridization techniques. The results indicated that the octoploid wheatwheatgrass chromosomes in Zhong 2 were derived from the distant homologous genomes of wheatgrass ( Agropyron intermedium (Host) P.B. = Elytrigia intermedia (Host) Nevski = Thinotopyrum intermedium (Host) Barkworth and Dewey, and thew distant homologous genomes were not from the E geaome of T. elongatum 2x. Zhong 2 contained 12 wheatgrass chromosomes in which a pair of chromosomes was involved in translocation between wheatgrass and wheat chromosomes.  相似文献   

12.
通过多胚水稻品系APⅣ与单胚水稻品种IR36、明恢77和龙特浦B正反杂交, 研究APⅣ的多卵遗传行为,表明APⅣ的多卵性状可能不是由孢子体基因型决定的,而是由雄配子体基因型决定,属配子体遗传的范畴。Abstract:The inheritance of poly-eggs was investigated by crossing and reciprocally crossing APIV with monoembryonic rice variety IR36,Minghui No.77 and Longtepu B,respectively.It was suggested that the production of poly-eggs is probably controlled by gametophytic genotypes,rather than sporophytic ones.  相似文献   

13.
    
The karyotype of the primary wheat-wheatgrass disomic addition line TAI-14 was 2n = 44 in which all of the chromosomes were metacentric and submetacentric. However, in the progeny of the TAI-14, a pair of telocentric chromosomes were observed. In order to clarify whether the telocentric chromosomes were of common wheat or of wheatgrass, the fluorescence in situ hybridization (FISH) technique was employed. It was revealed that the wheat chromosomes exhibited red fluorescence while the ditelocentric chromosomes green fluorescence. Therefore, the primary TAI-14 was conversed from the disomic addition line into the ditelocentrie addition line. The possible explanation for such a variation and the potential significance of the ditelocentric addition line were discussed briefly.  相似文献   

14.
建立常规G显带染色体标本的荧光原位杂交(FISH)技术,用于分析患者复杂的染色体易位。原位杂交前,用甲醛固定G显带标本,是获得良好显带和荧光杂交效果的关键步骤。仅用常规细胞遗传学方法分析,显示一例习惯性流产患者的核型为46,XX,t(1;5;12)(1pter→1q25::12q24→12qter;5qter→5p11::1q25→1qter,12pter→12q24:.5p11→5pter),而采用本方法确定患者的核型实际为46,XX,t(1;5,12)(1pter→1q23::12q22→12qter,5qter→5p11::1q25→1qter;12pter→12q22::1q23→1q25:5p11→5pter)。结果表明,新建立的G显带染色体荧光原位杂交(FISH)技术能更有效地检测患者复杂的染色体易位。  相似文献   

15.
应用FISH技术鉴定一个小冰麦易位系   总被引:4,自引:0,他引:4  
以生物素(biotin16dUTP)标记的天蓝冰草(Agropyronintermedium(Host)P.B.=Elytrigiaintermedia(Host)Nevski=Thinopyrumintermedium(Host)BarkworthandDewey)染色体组DNA为探针,普通小麦(TriticumaestivumL.)“中国春”DNA为封闭,用荧光原位杂交(FISH)技术对小冰麦33号进行检测。结果表明:在一对染色体的端部显现出绿色荧光,这说明小冰麦33号携带外源基因的冰草染色体片段位于小麦染色体端部,而且易位的染色体片段是较小的。从DNA水平直接证明小冰麦33是一个冰草染色体片段易位到小麦染色体端部的易位系。  相似文献   

16.
    
The genomic DNA of wheatgrass (Agropyron intermedium (Host) P.B. = Elytrigia intermedia (Host) Nevski = Thinopyrum intermedium (Host) Barkworth and Dewey) was labelled with biotin-16-dUTP as a probe, and genomic DNA of common wheat ( Triticum aestivum L. ) \"Chinese Spring\" was used for blocking. Wheat-wheatgrass line 33 was examined by fluorescence in situ hybridization (FISH) technique. The terminal regions of a pair of chromosomes showed green fluorescent signals. It has been concluded that chromosome segrnents containing alien genes of wheatgrass are located at the terminal regions of wheat chromosomes in wheat-wheatgrass line 33, and the translocated segments were small. Wheat-wheatgrass line 33 has been proved to be a translocation line with chromosome segments of wheatgrass translocated to the terminal regions of wheat chromoSomes.  相似文献   

17.
目的:通过荧光原位杂交技术(FISH)结合病理分级,探讨染色体畸形变与膀胱癌发生和发展的关系。方法:采用3、7、9、17号染色体着丝粒探针和9P16区带探针对105例膀胱癌复发患者尿液脱落细胞进行荧光原位杂交,观察膀胱癌复发患者中3、7、9、17号染色体的畸形变情况并分析其与患者临床和病理特征之间的关系。结果:105例膀胱癌复发患者中,3、7、9和17号染色体的非整数倍突变率分别是21.9%、29.5%、12.4%、和36.2%,与患者的性别、年龄无显著相关性(P0.05)。仅7号染色体畸变与膀胱癌的病理分级具有显著相关性(P0.05)。结论:7号染色体畸形变与复发膀胱癌的病理分级显著相关。  相似文献   

18.
目的:通过荧光原位杂交技术(FISH)结合病理分级,探讨染色体畸形变与膀胱癌发生和发展的关系。方法:采用3、7、9、17号染色体着丝粒探针和9P16区带探针对105例膀胱癌复发患者尿液脱落细胞进行荧光原位杂交.观察膀胱癌复发患者中3、7、9、17号染色体的畸形变情况并分析其与患者临床和病理特征之间的关系。结果:105例膀胱癌复发患者中,3、7、9和17号染色体的非整数倍突变率分别是21.9%、29.5%、12.4%、和36.2%,与患者的性别、年龄无显著相关性(P〉0.05)。仅7号染色体畸变与膀胱癌的病理分级具有显著相关性[(P〈0.05)。结论:7号染色体畸形变与复发膀胱癌的病理分级显著相关。  相似文献   

19.
Genomic in-situ hybridization (GISH) was used to determine the amount of wheat-rye chromosome pairing in wheat (Triticum aestivum) x rye (Secale cereale) hybrids having chromosome 5B present, absent, or replaced by an extra dose of chromosome 5D. The levels of overall chromosome pairing were similar to those reported earlier but the levels of wheat-rye pairing were higher than earlier determinations using C-banding. Significant differences in chromosome pairing were found between the three genotypes studied. Both of the chromosome-5B-deficient hybrid genotypes showed much higher pairing than the euploid wheat hybrid. However, the 5B-deficient hybrid carrying an extra chromosome 5D had significantly less wheat-rye pairing than the simple 5B-deficient genotype, indicating the presence of a suppressing factor on chromosome 5D. Non-homologous/non-homoeologous chromosome pairing was observed in all three hybrid genotypes. The value of GISH for assessing the level of wheat-alien chromosome pairing in wheat/alien hybrids and the effectiveness of wheat genotypes that affect homoeologous chromosome pairing is demonstrated.  相似文献   

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