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  • 1
    Electronic Resource
    Electronic Resource
    Physical map of chloroplast DNA in sugi, Cryptomeria japonica (1993)
    Springer
    Theoretical and applied genetics 86 (1993), S. 166-172 
    Details
    ISSN: 1432-2242
    Keywords: Cryptomeria japonica ; Chloroplast DNA ; Physical map ; Evolution of conifers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary To investigate the evolution of conifer species, we constructed a physical map of the chloroplast DNA of sugi, Cryptomeria japonica, with four restriction endonucleases, PstI, SalI, SacI and XhoI. The chloroplast genome of C. japonica was found to be a circular molecule with a total size of approximately 133 kb. This molecule lacked an inverted repeat. Twenty genes were localized on the physical map of C. japonica cpDNA by Southern hybridization. The chloroplast genome structure of C. japonica showed considerable rearrangements of the standard genome type found in vascular plants and differed markedly from that of tobacco. The difference was explicable by one deletion and five inversions. The chloroplast genome of C. japonica differed too from that of the genus Pinus which also lacks one of the inverted repeats. The results indicate that the conifer group originated monophyletically from an ancient lineage, and diverged independently after loss of an inverted repeat structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222075
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  • 2
    Electronic Resource
    Electronic Resource
    Geographical cline of chloroplast DNA variation in Abies mariesii (1994)
    Springer
    Theoretical and applied genetics 89 (1994), S. 922-926 
    Details
    ISSN: 1432-2242
    Keywords: Chloroplast DNA ; Abies mariesii ; Intraspecific variation ; Geographical cline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Where its populations are isolated in higher mountain regions, Abies mariesii is one of the more important conifers of Japan's alpine forest zone. In this study we tried to clarify the genetic variation of chloroplast DNA (cpDNA) in A. mariesii. Cones and fresh needles were collected from seven mountain regions. Total DNAs were extracted from individual seedlings, and these were digested by 15 restriction endonucleases. Southern hybridization was then done using cpDNA clones of Cryptomeria japonica and tobacco as probes. CpDNA variation was detected with enzyme-probe combinations: HindIII+pCS10 probe, HindIII+pCS7, and BglII+pCS7 in preliminary screening. These variations were considered to be caused by the same insertion, deletion or inversion. All populations surveyed for the combination HindIII+pCS10 resulted in only two frequency variations in each population. This indicates a gradual cline along latitude and longitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224518
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