玉米F_2群体中偏分离RFLP标记在染色体上的分布及原因分析     

曹永国  王国英  王守才  魏艳玲  卢江  谢友菊  戴景瑞 《中国农业大学学报》1998,(Z3)

研究了利用玉米85个 DNA 限制性片段长度多态性(RFLP)标记在玉米自交系7922与5003杂交 F2群体中的分离。结果表明,8.33%的标记显著或极显著地偏离了预期的孟德尔比例而表现偏分离,发现了2个偏分离的染色体热点,即第1染色体上的 umc128-umc107和第3染色体上的 asg24-asg48,其偏分离形成的主要原因是存在配子体选择。  相似文献   

玉米数量性状RFLP分子标记研究进展   总被引：8，自引：1，他引：7  

杨俊品  荣廷昭 《玉米科学》1999,7(1):018-024

本文综述了玉米数量性状特别是产量性状的RFLP分子标记近10年来的研究进展,包括所用群体类型及容量、标记图谱、主要QTL位点及其遗传效应。并指出了存在的问题及其发展趋势。  相似文献   

中国禽肾病变IBV分离株S1基因的RT-PCR/RFLP特性   总被引：1，自引：0，他引：1  

王林川  张桂云  黄勇  李华  廖明 《华南农业大学学报》1999,(1)

对中国１３个省市分离到的２９个肾病变ＩＢＶ毒株作了Ｓ１基因的ＲＴ－ＰＣＲ／ＲＦＬＰ特性鉴定．用相同的一对引物,８个毒株———广东／０１／８３,河南／０４／９４,河南／０５／９４,内蒙／０１／９３,江苏／０１／９３,河南／０１／９３,天津／０２／９３,内蒙／０２／９３,经ＲＴ－ＰＣＲ扩增获得了包含有Ｓ１基因ｃＤＮＡ的１７３４ｂｐ的片段;河南／０６／９５的为一１０００ｂｐ左右的片段;其它２０个毒株没有结果．经ＲＦＬＰ分析,广东／０１／８３,河南／０４／９４,河南／０５／９４,内蒙／０１／９３归类于Ｍａｓｓａｃｈｕｓｅｔｓ血清型,江苏／０１／９３归于Ｇｒａｙ血清型,河南／０１／９３,天津／０２／９３,内蒙／０２／９３是新的变异株．研究结果表明,国内禽肾病变ＩＢ的致病毒株,在不同的地区有其特异的变异株,也有一个共同的血清型———Ｍａｓａｃｈｕｓｅｔｓ型的毒株  相似文献   

我国六个地区银鲫种群线粒体DNA多态性的研究   总被引：12，自引：2，他引：10  

姚纪花 《水产学报》1998,22(4):289-295

本文用一对引物对我国６个地区银鲫进行ｍｔＤＮＡ－ＮＤ５／６片段的ＰＣＲ扩增,扩增产物用６种限制性内切酶进行限制生片段长度多态性分析。共获得１１种图谱和７种限制性类型。根据各群体间的遗传距离构建了ＵＰＧ聚类关系图。结果表明,６个银鲫种群中,云南群体与贵州群体的关系以及黑龙江与安徽群体之间的关系最近,它们分别归为一个群体;河南群体相对独立,它与黑龙江和安徽群体的遗传关系较近,江西群体与各群体间的亲缘关  相似文献   

二倍体和四倍体泥鳅线粒体ND-5/6基因多态性的PCR-RFLP分析     

郑鹏飞  张桂蓉  魏开建  邹桂伟  王卫民  周玲玲  冉伟 《水利渔业》2011,32(1)

采用PCR-RFLP分析方法,对洞庭湖、武汉两地的二倍体和四倍体泥鳅线粒体DNAND-5/6基因多态性及4个群体遗传变异和遗传关系进行了研究。结果表明,120尾泥鳅mtDNAND-5/6扩增片段长度均为2.2kb;从13种限制性内切核酸酶中筛选出6种多态性内切酶(HaeⅢ、DraⅠ、RsaⅠ、TaqⅠ、HinfⅠ、MspⅠ),对扩增产物进行酶切,共检测到66种单倍型。泥鳅群体内单倍型多样性和核苷酸多样性分别为0.7679～0.9385和0.01041～0.03212;其中,洞庭湖二倍体核苷酸多样性最高(0.03212),武汉二倍体其次(0.02452),二倍体群体内核苷酸多样性高于四倍体。群体间的核苷酸多样性(π)大小为0.02588～0.04144,平均值为(0.031737±0.000005)。群体间的核苷酸歧化距离(δ)大小为0.00462～0.01617,平均值为(0.010659±0.000003);其中,武汉二倍体和四倍体之间的核苷酸歧化距离最大(0.01617),武汉四倍体和洞庭湖二倍体之间的核苷酸歧化距离最小(0.00462)。MonteCarlo模拟x2检验表明,4个群体间的单倍型频率存在极...  相似文献   

东昌湖野生鲤鱼线粒体DNA RFLP分析     

闫华超  李桂兰  张永忠 《水生态学杂志》2011,32(2):149-152

利用差速离心法及RNase消化法制备并纯化了采自山东东昌湖野生鲤(Cyprinus carpio haematopterus)的肝脏及性腺线粒体DNA,用7种限制性内切酶对其mtDNA进行酶解,经琼脂糖凝胶电泳分离酶解片段,用Gel-5000凝胶图像分析系统进行采集和分析。结果显示,东昌湖野生鲤的mtDNA分子大小为(16.62±0.15)kb,BglⅠ、BglⅡ、EcoRⅠ、HindⅢ、PstⅠ、KpnⅠ和BamHⅠ的酶切点分别为3或2、1、3或4、4、1、0、3;其中,BglⅠ、EcoRⅠ和BamHⅠ内切酶具有限制性多态性,多态酶比例为42.86%,并检测出12个限制性态型,可归并为5种单倍型,各单倍型间的遗传距离0.0075～0.0365,揭示了东昌湖野生鲤存在较高的种内多态性。试验结果与以前报道的其他地区鲤属线粒体DNA酶切结果相比较,表明鲤属mtDNA在限制性酶切位点数量及其长度上存在地域差异。  相似文献   

二倍体和四倍体泥鳅线粒体ＮＤ ５／６基因多态性的ＰＣＲ ＲＦＬＰ分析     

郑鹏飞  张桂蓉  魏开建  邹桂伟  王卫民  周玲玲  冉伟 《水生态学杂志》2011,32(1):51-56

采用PCR-RFLP分析方法,对洞庭湖、武汉两地的二倍体和四倍体泥鳅线粒体DNAND-5/6基因多态性及4个群体遗传变异和遗传关系进行了研究。结果表明,120尾泥鳅mtDNAND-5/6扩增片段长度均为2.2kb;从13种限制性内切核酸酶中筛选出6种多态性内切酶(HaeⅢ、DraⅠ、RsaⅠ、TaqⅠ、HinfⅠ、MspⅠ),对扩增产物进行酶切,共检测到66种单倍型。泥鳅群体内单倍型多样性和核苷酸多样性分别为0.7679～0.9385和0.01041～0.03212;其中,洞庭湖二倍体核苷酸多样性最高(0.03212),武汉二倍体其次(0.02452),二倍体群体内核苷酸多样性高于四倍体。群体间的核苷酸多样性(π)大小为0.02588～0.04144,平均值为(0.031737±0.000005)。群体间的核苷酸歧化距离(δ)大小为0.00462～0.01617,平均值为(0.010659±0.000003);其中,武汉二倍体和四倍体之间的核苷酸歧化距离最大(0.01617),武汉四倍体和洞庭湖二倍体之间的核苷酸歧化距离最小(0.00462)。MonteCarlo模拟x2检验表明,4个群体间的单倍型频率存在极显著差异(P<0.0001)。UPGMA聚类分析表明,武汉四倍体、洞庭湖二倍体和四倍体聚为一支,亲缘关系较近;武汉二倍体为单独一支。  相似文献   

Mycobacteriosis caused by Mycobacterium marinum in reared mullets: first evidence from Sardinia (Italy)          下载免费PDF全文

E Antuofermo  A Pais  M Polinas  T Cubeddu  M Righetti  M A Sanna  M Prearo 《Journal of fish diseases》2017,40(3):327-337

Mycobacterium marinum is a slow‐growing non‐tuberculous mycobacterium, and it is considered the most common aetiologic agent of mycobacteriosis in wild and cultured fish. The diagnosis is principally made by histology when positive Ziehl–Neelsen stain granulomas are detected. The aim of this study was to investigate the occurrence of mycobacteriosis in extensively cultured Mugilidae of two lagoons (Cabras and San Teodoro) from Sardinia by the use of histology, microbiology, PCR and DNA sequencing. Nine of 106 mullets examined were affected by mycobacteriosis, and the spleen was the most affected organ. The histology detected higher rate (100%) of infection in spleen than the culture and PCR (75% and 62.5%, respectively). The sequencing of hsp65 gene identified M. marinum as the primary cause of mycobacteriosis in the mullets examined. Mullets affected by mycobacteriosis were mainly fished in the San Teodoro lagoon characterized by critical environmental conditions. Histology remains the most common method in detecting fish affected by mycobacteriosis, and PCR‐based methods are essential for species identification. Our finding are worthy of attention because mycobacteriosis caused by M. marinum in reared mullets was evidenced for the first time in Sardinia, suggesting that this disease may be underestimated also in other cultured fish species.  相似文献   

Population differentiation in the banana leaf spot pathogen Mycosphaerella musicola, examined at a global scale     

H. L. Hayden †‡  J. Carlier  E. A. B. Aitken 《Plant pathology》2003,52(6):713-719

Single-copy restriction fragment length polymorphism (RFLP) markers were used to determine the genetic structure of the global population of Mycosphaerella musicola , the cause of Sigatoka (yellow Sigatoka) disease of banana. The isolates of M. musicola examined were grouped into four geographic populations representing Africa, Latin America and the Caribbean, Australia and Indonesia. Moderate levels of genetic diversity were observed for most of the populations ( H  = 0·22–0·44). The greatest genetic diversity was found in the Indonesian population ( H =  0·44). Genotypic diversity was close to 50% in all populations. Population differentiation tests showed that the geographic populations of Africa, Latin America and the Caribbean, Australia and Indonesia were genetically different populations. Using F _ST tests, very high levels of genetic differentiation were detected between all the population pairs ( F _ST > 0·40), with the exception of the Africa and Latin America-Caribbean population pair. These two populations differed by only 3% ( F _ST = 0·03), and were significantly different ( P  < 0·05) from all other population pairs. The high level of genetic diversity detected in Indonesia in comparison to the other populations provides some support for the theory that M. musicola originated in South-east Asia and that M. musicola populations in other regions were founded by isolates from the South-east Asian region. The results also suggest the migration of M. musicola between Africa and the Latin America-Caribbean region.  相似文献   

piggyBac转座酶的瞬时表达对莱茵衣藻体内piggyBac转座子的作用     

齐淑圆  Majid ESHAGHI  Deying SUN  何靖  杨小杭  刘建华 《农业生物技术学报》2016,(11):1643-1651

piggyBac转座系统作为一种遗传修饰的工具,在很多生物体如哺乳动物、昆虫、酵母中已经得到了广泛应用.然而,目前piggyBac转座系统在绿藻一莱茵衣藻(Chlamydomonas reinhardti)中是否有活性很少有入研究.本研究构建含有一个拷贝或多个拷贝并且能够稳定表达piggyBac转座元件的莱茵衣藻藻株.然后在含有转座元件的藻株中瞬时表达普通的piggyBac转座酶和密码子优化后的piggyBac转座酶,通过限制性片段长度多态性(restriction fragment length polymorphism,RFLP)分析piggyBac转座元件的转座现象.转座酶转入莱茵衣藻细胞内一周和两周之后与转入之前的RFLP图谱对比,有很明显的差异.转入转座酶一周后的TR1藻株原有的1.5kb大小的片段消失,同时出现了3条新的片段:2.8、4.2和6.5 kb.两周之后,这3条片段又发生了变化,表明转座现象存在并且持续发生.转入密码子优化后转座酶一周后的TR3藻株中,1.5、3和4kb大小的片段没有发生改变,但是6.5 kb大小的片段消失了,与此同时新出现了一个2.8 kb大小的片段.两周之后,TR3的限制性片段多态性图谱并没有发生变化.为了检测转座酶是否成功转入细胞中,我们在新的接头序列两侧进行侧翼PCR,同时对PCR产物进行序列比对分析,结果显示,piggyBac转座子偶尔会在非常规性位点5’-TTT-3’和5’-ACGCAG-3’处发生剪切,而常规性剪切位点发生在5’-TTAA-3’处.研究结果表明,piggyBac转座酶对莱茵衣藻体内piggyBac转座子具有转座作用,piggyBac转座系统可以用于莱茵衣藻的遗传学修饰.  相似文献