LIMITED GENETIC DIVERSITY IN THE ENDOPHYTIC SUGARCANE BACTERIUM ACETOBACTER-DIAZOTROPHICUS

被引:60
作者
CABALLEROMELLADO, J [1 ]
MARTINEZROMERO, E [1 ]
机构
[1] UNIV NACL AUTONOMA MEXICO, CTR INVEST FIJAC NITROGENO, DEPT MOLEC GENET, CUERNAVACA, MORELOS, MEXICO
关键词
D O I
10.1128/AEM.60.5.1532-1537.1994
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Acetobacter diazotrophicus isolates that originated from different sugarcane cultivars growing in diverse geographic regions of Mexico and Brazil were shown to have limited genetic diversity. Measurements of polymorphism in the electrophoretic mobilities of metabolic enzymes revealed that the mean genetic diversity per enzyme locus (among the four electrophoretic types distinguished) was 0.064. The results of the genetic analysis indicate that the genetic structure of A. diazotrophicus is clonal, with one largely predominant clone. Plasmids were present in 20 of 24 isolates, and the molecular sizes of the plasmids ranged from 2.0 to 170 kb. Two plasmids (a 20- to 24-kb plasmid detected in all 20 plasmid containing isolates and a 170-kb plasmid observed in 14 isolates) were highly conserved among the isolates examined. Regardless of the presence of plasmids, all of the isolates shared a common pattern of nif structural gene organization on the chromosome.
引用
收藏
页码:1532 / 1537
页数:6
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