Characterization of the (GAAA) microsatellite region in the plant parasitic nematode Meloidogyne artiellia.
Microsatellites have become one of the most powerful genetic markers in biology. We have used DNA sequencing to characterize a highly variable microsatellite (GAAA) locus in the root-knot nematode Meloidogyne artiellia. The use of microsatellite flanking primers produced four amplification products that are defined as electromorphs, based on conventional length criteria. The sequencing of these four amplification products revealed the presence of new variants in the population due to sequence variability. The sum of electromorphs and sequence polymorphisms resulted in a total of six variants. The high degree of variability in the microsatellite containing region is due not only to variation in the number of tetranucleotide repeats but also to variation (length and site variation) in the flanking regions of the microsatellite. These investigations show that, in spite of the size homoplasy, the variability of the microsatellite flanking sequences of M. artiellia could be used as informative markers for phylogenetic reconstructions.
Istituto di Nematologia Agraria, CNR, Trav. 174 di via Amendola 168/5, 70125 Bari, Italy. nemafd05@area.area.ba.cnr.it
Francesca
F
De Luca
Aurelio
A
Reyes
Pasqua
P
Veronico
Mauro
M
Di Vito
Franco
F
Lamberti
Carla
C
De Giorgi
D000483:Alleles; D000818:Animals; D001483:Base Sequence; D018509:DNA, Helminth / Q000737:chemistry / Q000235:genetics; D018895:Microsatellite Repeats / Q000235:genetics*; D008969:Molecular Sequence Data; D010944:Plants / Q000469:parasitology; D011110:Polymorphism, Genetic; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid; D014431:Tylenchoidea / Q000235:genetics*
D018509:DNA, Helminth