小麦光温敏核雄性不育系BS20育性的QTL分析

以小麦(Triticum aestivum L.)光温敏不育系BS20×Fu3 DH群体的289个系为材料,于2005-2006年度种植于北京海淀和安徽阜阳,进行了育性(结实率和结实小穗率)的调查.利用SSR标记和分离群体分组分析法(BSA)分析该群体中与育性相关的分子标记,用128对SSR引物,初步构建BS20×Fu3群体的分子标记遗传连锁框架图.BSA的结果表明,与育性连锁的3个标记是Xgwm294、Xgwm374和Xgwm44,分别位于染色体2AL、2BS和7DS;采用混合线性复合区间作图法对小麦育性进行QTL分析,检测到6个QTL,分布在1AS、2BS、2DL、6AL、6BL和7DS染色体,贡献率为1.1%～12.5%,其中7DS上的QTL与2BS、6AL和6BL上的QTL存在显著的互作效应.综合BSA和QTL分析结果,确定染色体7DS和2BS上的QTL重复性较好、贡献率和互作效应较大,为小麦光温敏核雄性不育性状的重要QTL,标记区间分别为Xgum44-Xcfd14和Xgwm148-Xgwm374,贡献率分别为7.2%～12.5%和2.1%～2.5%.     

Influence of orally administered CpG-ODNs on the humoral response to bovine serum albumin (BSA) in chickens

Synthetic oligodeoxynucleotides containing CpG motifs (CpG-ODNs) have been reported to be effective mucosal adjuvants in mice when given orally. Studies on their effectiveness in chickens are currently very limited. This study investigated whether CpG-ODNs could adjuvant the immune response to BSA when given orally to a commercial line of SCWL chickens. In two experiments, performed over time, chickens were given selected concentrations of CpG-ODNs with BSA followed by 6 consecutive days of ad libitum access to drinking water containing 1.4 mg/ml BSA. Serum responses, and in some cases intestinal specific antibodies, were measured out to 33 days post-immunization. Birds receiving a single dose of CpG-ODN had consistently higher IgG, IgM, and IgA titers in the serum, dependent upon dose, and in specific areas of the intestine when compared to the non-immunized and BSA only groups. These findings suggest that a single oral CpG-ODN administration can accelerate the kinetics of antigen specific antibodies of all three isotypes in commercial-strain chickens immunized via the drinking water using common protein antigen.     

尼古丁猝灭牛血清蛋白荧光机制的研究

研究了尼古丁对牛血清蛋白荧光光谱变化,以及牛血清蛋白荧光猝灭机制,同时利用同步荧光研究了尼古丁对酪氨酸和色氨酸的影响,结果表明:尼古丁猝灭牛血清蛋白荧光是通过静态机制,形成常数为KA=2.1×107 L.mol-1,每一个牛血清蛋白分子结合尼古丁的位点数为0.22,牛血清蛋白与尼古丁的这种结合是很弱的,没有影响分子的构象,酪氨酸残基荧光没有变化,只是色氨酸荧光强度降低,荧光峰位置不变。     

Identification of Co-Segregating RAPD Marker Linked to Powdery Mildew Resistance Gene Pm 18 in Wheat

The Pm18 gene of wheat confers resistance to the powdery mildew which is oneof the most serious diseases in many regions of the world. In this study, bulked segregant analysis (BSA) was used to develop randomly amplified polymorphic DNA (RAPD) markers linked to Pml8 gene. Three hundred and twenty decamer primers were screened and one of them was identified as RAPD marker (S411600) linked to Pml8. Using the F2 mapping population from the cross Pml8 × Chancellor, the marker S411600 was shown to co-segregate with the gene Pml8. This marker can be conveniently used for marker-assisted selection in wheat breeding programs for the identification or pyramiding of Pml8 with other resistance genes.     

大豆抗胞囊线虫病S11700特异性抗性基因标记

大豆胞囊线虫病是世界大豆产区危害最重的病害之一.本文以高抗大豆胞囊线虫3号生理小种的黑豆品种小粒黑豆为父本,以高感大豆胞囊线虫3号生理小种的品种辽豆10号为母本配制杂交组合.利用分离群体分组分析法(BSA)对辽豆10号×小粒黑豆杂交组合的F2代大豆材料基因组DNA进行了RAPD分析,供试的143个随机引物有92个产生了RAPD扩增产物,其中产生RAPD多态性的随机引物有25个.筛选到一个与抗大豆胞囊线虫基因相关的特异性DNA片段S 11700,此RAPD标记具有较高的重复性和稳定性,可用于优良的抗大豆胞囊线虫新品种的辅助选育.     

Identification of molecular markers linked with crown rust (Puccinia coronata f. sp. lolii) resistance in perennial ryegrass (Lolium perenne) using AFLP markers and a bulked segregant approach

Crown rust resistance is an important selection criterion in ryegrass breeding. The fungal disease caused by P. coronata causes yield loss and a reduced quality of the fodder crop. Molecular markers were used to unravel the genomic organization of crown rust resistance in a segregating L. perenne population. Two genomic regions involved in crown rust resistance were identified that together explained 35% of the phenotypic variance present. Bulked segregant analysis in combination with AFLP markers was a suitable method to identify DNA markers associated with genomic regions of major effect. One cluster of AFLP markers explained 6.1% of the variance and mapped to linkage group 2, a genomic region known to contain crown rust resistance genes. A second cluster of AFLP markers detected a novel genomic region of major effect that explained 27.7% of the phenotypic variance in crown rust resistance. This cluster was unlinked to the cluster on linkage group 2. Divergent selections performed within the segregating F₁ population on the basis of genotype and phenotype revealed that the markers associated with crown rust resistance identified in this study have potential for marker assisted selection. Selection of plants on the basis of markers was more straightforward than the selection on the basis of phenotype.     

猪带绦虫六钩蚴重组蛋白TSOL18与BSA偶连蛋白的制备

应用异型双功能连接剂MBS(间-马来酰亚胺苯甲酸-N-羟基琥珀酰亚胺酯)将猪带绦虫六钩蚴18ku重组蛋白(TSOL18)和载体蛋白-牛血清白蛋白(BSA)进行连接,制备连接蛋白BSA-TSOL18,用以增强TSOL18的免疫原性.连接蛋白利用快速脱盐柱分离技术进行纯化;纯化后应用醋酸纤维薄膜电泳证明二者的结合情况;并用间接ELISA法检测不同摩尔比连接产物中抗原部分的活性.结果表明:TSOL18与BSA偶连摩尔比为1∶3时连接有效,且对抗原活性影响小,可满足进一步免疫的要求.     

用SSR标记进行野生大豆耐碱基因定位及QTL分析

以抗碱野生大豆Gs0001(♀)和碱敏感栽培大豆吉科豆1号(♂)的F2群体作为基因定位群体,通过BSA法(Bulked-segegant analysis,群分法),对大豆耐碱基因进行SSR分子标记定位。在分布于大豆20个连锁群的488对SSR引物中,筛选出7对与耐碱基因紧密连锁的标记,这7对标记位于G连锁群相近的区域。利用Mapmaker/EXP3.0分析,在最小似函数值LOD=14.0时,将耐碱基因定位于Satt298与Satt269之间,距离两个标记的遗传距离分别为1.3 cm和6.9 cm。此耐碱基因的贡献率是40.31%。     

A Co-Dominant Marker BoE332 Applied to Marker-Assisted Selection of Homozygous Male-Sterile Plants in Cabbage (Brassica oleracea var. capitata L.)

The dominant genic male sterility (DGMS) gene CDMs399-3 derived from a spontaneous mutation in the line 79-399-3 of spring cabbage (Brassica oleracea var. capitata L.), has been successfully applied in hybrid seed production of several cabbage cultivars in China. During the development of dominant male sterility lines in cabbage, the conventional identification of homozygous male-sterile plants (CDMs399-3/CDMs399-3) is a laborious and time-consuming process. For marker-assisted selection (MAS) of the gene CDMs399-3 transferred into key spring cabbage line 397, expressed sequence tag-simple sequence repeats (EST-SSR) and SSR technology were used to identify markers that were linked to CDMs399-3 based on method of bulked segregant analysis (BSA). By screening a set of 978 EST-SSRs and 395 SSRs, a marker BoE332 linked to the CDMs399-3 at a distance of 3.6 cM in the genetic background of cabbage line 397 were identified. 7 homozygous male-sterile plants in population P1170 with 20 plants were obtained finally via MAS of BoE332. Thus, BoE332 will greatly facilitate the transferring of the gene CDMs399-3 into the key spring cabbage line 397 and improve the application of DGMS in cabbage hybrid breeding.     

Logically Sensing Aggregate Process and Discriminating SDS from Other Surfactants with the Assistance of BSA

An amphiphilic fluorescent probe, 3-dodecylamino dihydrogen imidazo[2,l-a]benz[de]isoquinolin-7-one （compound 3）, was used to sense the aggregate formation process of bovine serum albumine （BSA）, sodiu...