Sex in Escherichia coli does not disrupt the clonal structure of the population: evidence from random amplified polymorphic DNA and restriction-fragment-length polymorphism

1995 ◽  
Vol 41 (4) ◽  
pp. 440-448 ◽  
Author(s):  
Patricia Desjardins ◽  
Bertrand Picard ◽  
Bernhard Kaltenböck ◽  
Jacques Elion ◽  
Erick Denamurl
Keyword(s):  
Escherichia Coli ◽  
Restriction Fragment Length Polymorphism ◽  
Restriction Fragment ◽  
Length Polymorphism ◽  
Fragment Length ◽  
Fragment Length Polymorphism ◽  
Random Amplified Polymorphic Dna ◽  
Clonal Structure ◽  
Restriction Fragment Length

Identification of restriction fragment length polymorphism and random amplified polymorphic DNA markers linked to downy mildew resistance genes in lettuce, using near-isogenic lines

Genome ◽  
1991 ◽  
Vol 34 (6) ◽  
pp. 1021-1027 ◽  
Author(s):  
Ilan Paran ◽  
Richard Kesseli ◽  
Richard Michelmore
Keyword(s):  
Restriction Fragment Length Polymorphism ◽  
Restriction Fragment ◽  
Length Polymorphism ◽  
Fragment Length ◽  
Rapd Markers ◽  
Fragment Length Polymorphism ◽  
Random Amplified Polymorphic Dna ◽  
Near Isogenic Lines ◽  
Isogenic Lines ◽  
Restriction Fragment Length

Near-isogenic lines were used to identify restriction fragment length polymorphism (RFLP) and random amplified polymorphic DNA (RAPD) markers linked to genes for resistance to downy mildew (Dm) in lettuce. Two pairs of near-isogenic lines that differed for Dm1 plus Dm3 and one pair of near-isogenic lines that differed for Dm11 were used as sources of DNA. Over 500 cDNAs and 212 arbitrary 10-mer oligonucleotide primers were screened for their ability to detect polymorphism between the near-isogenic lines. Four RFLP markers and four RAPD markers were identified as linked to the Dm1 and Dm3 region. Dm1 and Dm3 are members of a cluster of seven Dm genes. Marker CL922 was absolutely linked to Dm15 and Dm16, which are part of this cluster. Six RAPD markers were identified as linked to the Dm11 region. The use of RAPD markers allowed us to increase the density of markers in the two Dm regions in a short time. These regions were previously only sparsely populated with RFLP markers. The rapid screening and identification of tightly linked markers to the target genes demonstrated the potential of RAPD markers for saturating genetic maps.Key words: lettuce, downy mildew, near-isogenic lines, disease resistance, restriction fragment length polymorphism, random amplified polymorphic DNA.

Phenetic relationships and levels of variability detected by restriction fragment length polymorphism and random amplified polymorphic DNA analysis of cultivated and wild accessions of Lycopersicon esculentum

Genome ◽  
1993 ◽  
Vol 36 (3) ◽  
pp. 619-630 ◽  
Author(s):  
Christie E. Williams ◽  
Dina A. St. Clair
Keyword(s):  
Restriction Fragment Length Polymorphism ◽  
Lycopersicon Esculentum ◽  
Genetic Distance ◽  
Restriction Fragment ◽  
Length Polymorphism ◽  
Fragment Length ◽  
Fragment Length Polymorphism ◽  
Random Amplified Polymorphic Dna ◽  
Polymorphic Loci ◽  
Restriction Fragment Length

Random amplified polymorphic DNA (RAPD) and restriction fragment length polymorphism (RFLP) markers were used to assess the variability in tomato germplasm (Lycopersicon esculentum Mill.), which included 46 accessions from the following groups: vintage cultivars, modern cultivars, South American regional cultivars, and wild L. esculentum van cerasiforme. Two L. cheesmanii accessions served as an outgroup. The 48 accessions were monomorphic at 135 of the 215 RAPDs loci and 31 of the 48 RFLP loci that were assayed. Alleles were identified that distinguished the five groups and many of the cultivars. The frequency of polymorphic loci was low in vintage cultivars, with less than 2.8% of the loci being variable within the group. In contrast, introgression of wild germplasm into modern cultivars has increased the polymorphic loci to 11.6%, whereas within the group of regional cultivars linkage drag and outcrossing may be responsible for the further increase to 20.3%. These levels of genetic variability were lower in comparison to the 24.5% polymorphic loci of cerasiforme, a group that may contain unutilized desirable traits. The small genetic distance from the vintage cultivars to several of the widely distributed regionals and cerasiformes indicated that proximity of vintage cultivars in Latin America may have resulted in intercrossing of these materials with the wilder germplasm. RAPDs appear promising for both germplasm fingerprinting and as a predictor of genetic diversity for plant breeding applications.Key words: tomato, restriction fragment length polymorphism (RFLP), random amplified polymorphic DNA (RAPD), genetic distance.

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