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  • Digitale Medien  (2)
  • Calocedrus decurrens (Torr.) Florin  (1)
  • Chloroplast DNA  (1)
  • 1
    ISSN: 1432-0983
    Schlagwort(e): Pinaceae ; Length mutation ; Repetitive DNA ; Chloroplast DNA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We determined the DNA sequence of a 2.7-kb cpDNA XbaI fragment from douglas-fir [Pseudotsuga menziesii (Mirb.) Franco]. RFLPs revealed by the 2.7-kb XbaI clone were observed to vary up to 1 kb among species within the genus Pseudotsuga and up to 200 bp among trees of P. menziesii. The polymerase chain reaction (PCR) allowed the locus of polymorphism to be identified, and the variable region was then sequenced in a second Douglas-fir tree, a single tree of a related species, Japanese Douglas-fir (P. japonica), and in a species lacking a mutation hotspot in the region, Pinus radiata (Monterey pine). The locus of polymorphism is characterized by hundreds of base pairs of imperfect, tandem direct repeats flanked by a partially duplicated and an intact trnY-GUA gene. The duplication is direct in orientation and consists of 43 bp of the 3′ end of trnY and 25 bp of its 3′ flanking sequence. Tandem repeats show high sequence similarity to a 27-bp region of the trnY gene that overlaps one end of the duplication. The two trees of Douglas-fir sequenced differed by a single tandem repeat unit, whereas these trees differed from the Japanese Douglas-fir sequenced by approximately 34 repeat units. Repetitive DNA in the Pseudotsuga cpDNA hotspot was most likely generated at the time of the partial trnY gene duplication and these sequences expanded by slipped-strand mispairing and unequal crossingover.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1432-2242
    Schlagwort(e): cpDNA RFLPs ; Sequoia sempervirens D. Don Endl. ; Pseudotsuga menziesii (Mirb.) Franco ; Calocedrus decurrens (Torr.) Florin ; Pinus taeda L.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The extent and type of chloroplast DNA restriction fragment length polymorphism was determined among individual tree samples of coast redwood, Douglas fir, incense-cedar, and loblolly pine. A total of 107 trees was surveyed for three restriction enzymes (BamHI, EcoRI, HindIII) and six chloroplast DNA probes from petunia (P3, P4, P6, P8, P10, S8). The probes comprise 64% of the petunia chloroplast genome. Polymorphisms were detected in all species but loblolly pine. Coast redwood and incense-cedar had a small number of rare variants, whereas Douglas fir had one highly polymorphic region of insertions/deletions in sequences revealed by the P6 probe from petunia. The mutation hotspot is currently being studied by DNA sequence analysis.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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