Analysis of Salmonella enterica serotype Enteritidis isolated from human and chickens by repetitive sequence-PCR fingerprinting, antibiotic resistance and plasmid profiles

A total of 22 Salmonella enterica serotype Enteritidis (S. Enteritidis) strains isolated from human and chicken were subjected to DNA fingerprinting by repetitive sequence PCR using ERIC and BOX primers, antibiotic resistance and plasmid patterns. Both ERIC and BOX PCR amplification data revealed a highly genetic homogeneity between isolates from human and chicken except one isolate, which originated from chicken and showed a different DNA band pattern from others. Eleven of 22 S. Enteritidis isolates (50%) were resistant to more than one antibiotics and characterized by 5 resistance patterns. The most common pattern was penicillin resistant (63.6%). Only one isolate from chicken showed a multiple drug resistance patterns to 4 antibiotics. All 22 S. Enteritidis isolates harbored more than two plasmids with eight different plasmid profiles including two to six plasmids with approximate molecular size ranging from 1.9 to 21 kb. A band of 15 kb size was detected in all isolates tested, however, the band sizes smaller than 15 kb were found only in isolates from chicken.     

利用ISSR分析技术鉴定贵州枇杷新种质的研究

为探索枇杷新种质的鉴定方法,利用ISSR标记,构建了贵州18个枇杷栽培品种及课题组选育的7个优良新种质的DNA指纹图谱,并分析其相互间的亲缘关系。结果表明:以筛选出的15条引物进行PCR扩增,获得清晰、重复性好的谱带172条,其中多态性谱带157条,多态性比例为91.3%;应用3个引物825、834和848的组合,构建了25份枇杷品种（系）的ISSR指纹图谱,可以有效区分所有供试材料;聚类分析显示,在相似性系数为0.60时,可将供试种质分成2大类:一类主要为原产于浙江的品种（系）,另一类主要为原产于四川的品种及选育的新种质;因此,ISSR标记能有效地用于枇杷栽培种及新种质的分子鉴定及其亲缘关系的解析。