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  • 1
    Electronic Resource
    Electronic Resource
    Differential changes in copy numbers of rice mitochondrial plasmid-like DNAs and main mitochondrial genomic DNAs that depend on temperature (1998)
    Springer
    Current genetics 33 (1998), S. 437-444 
    Details
    ISSN: 1432-0983
    Keywords: Key words Mitochondrial DNA ; Plasmid-like DNA ; Temperature dependency ; Rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The mitochondria of rice contain four kinds of circular plasmid-like DNAs, namely, B1, B2, B3 and B4, in addition to the main mitochondrial genomic DNAs. In order to examine the genetic stability of mitochondrial plasmid-like DNAs, changes in the amounts of plasmid-like DNAs and main mitochondrial genomic DNAs were analyzed in calli that had been cultured at various temperatures. The observed effect of temperature on the levels of plasmid-like DNAs was larger than that on the main mitochondrial genomic DNAs. A significant reduction in the copy number of plasmid-like DNAs was detected in calli cultured at 35 °C, as compared to 20 °C, 25 °C and 30 °C. The effect of temperature on DNA synthesis in isolated mitochondria was also analyzed. Synthesis of the main mitochondrial genomic DNAs occurred at all the temperatures examined, whereas synthesis of plasmid-like DNAs occurred only over a limited range of temperatures. The results of both in vivo and in vitro analyses suggest that plasmid-like DNAs are less stably maintained than the main mitochondrial genomic DNAs, which is consistent with the notion that the transmission of mitochondrial plasmid-like DNAs from one generation to the next may be unstable under unusual conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050357
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  • 2
    Electronic Resource
    Electronic Resource
    Inter- and intra-specific distribution of Stowaway transposable elements in AA-genome species of wild rice (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 327-335 
    Details
    ISSN: 1432-2242
    Keywords: Key words Wild rice ; Transposable element ; Life-history traits ; Geographic distribution ; Phylogenetic relationship
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  The presence or absence of miniature inverted-repeat transposable elements (MITEs) that belong to Stowaway family was analyzed at three loci, two of which are newly identified, in five wild rice species having the AA genome. The pattern of the presence or absence of MITEs was found to be highly associated with speciation in this plant group. In Oryza rufipogon, the pattern was also associated with differentiation into annual or perennial ecotypes. These results suggest either that gene flow has been highly restricted between different species, as well as between different ecotypes of O. rufipogon after they were differentiated, or that loci with or without MITEs have been selected in nature together with the linked genes that are responsible for adaptation to environments. In addition, a very low polymorphism with regard to the presence or absence of MITEs within each species or each ecotype suggests that the frequency of transposition of MITEs is very low, assuming that the loci that contain MITEs are free from selection pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051487
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sequence variation of non-coding regions of chloroplast DNA of soybean and related wild species and its implications for the evolution of different chloroplast haplotypes (2000)
    Springer
    Theoretical and applied genetics 101 (2000), S. 724-732 
    Details
    ISSN: 1432-2242
    Keywords: Key words Soybean ; Chloroplast DNA ; Non-coding region ; DNA sequencing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Soybean chloroplast DNAs (cpDNAs) are classified into three types (I, II and III) based on RFLP profiles. Type I is mainly observed in cultivated soybean (Glycine max), while type II and type III are frequently found in both cultivated and wild soybean (Glycine soja), although type III is predominant in wild soybean. In order to evaluate the diversity of cpDNA and to determine the phylogenetic relationship among different chloroplast types, we sequenced nine non-coding regions of cpDNA for seven cultivated and 12 wild soybean accessions with different cpDNA types. Eleven single-base substitutions and a deletion of five bases were detected in a total of 3849 bases identified. Five mutations distinguished the accessions with types I and II from those with type III, and seven were found in the accessions with type III, independently of their taxa. Four species of the subgenus Glycine shared bases that were identical to those with types I and II at two of the five mutation sites and shared bases that were identical to those with type III at the remaining three sites. Therefore, the different cpDNA types may not have originated monophyletically, but rather may have differentiated from a common ancestor in different evolutionary directions. A neighbor-joining tree resulting from the sequence data revealed that the subgenus Soja connected with Glycine microphylla which formed a distinct clade from Clycine clandestina and the tetraploid cytotypes of Glycine tabacina and Glycine tomentella. Several informative length mutations of 54 to 202 bases, due to insertions or deletions, were also detected among the species of the genus Glycine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051537
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  • 4
    Electronic Resource
    Electronic Resource
    Restriction fragments homologous to mitochondrial plasmid-like DNAs are located within limited chromosomal regions on the rice nuclear genome (1993)
    Springer
    Theoretical and applied genetics 87 (1993), S. 577-586 
    Details
    ISSN: 1432-2242
    Keywords: Mitochondrial DNA ; Plasmid-like DNA ; Nuclear homologue ; Inter-organellar sequence transfer ; Rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chromosomal locations of restriction fragments of nuclear DNA that were homologous to four mitochondrial plasmid-like DNAs, namely, B1, B2, B3 and B4, were analyzed by restriction fragment length polymorphism (RFLP) analysis in cultivated rice. Nine kinds of fragments homologous to plasmidlike DNAs were analyzed for their segregation in three different F2 populations derived from intercrosses between rice subspecies; these were found to be localized in three chromosomal regions: three, one and five kinds of nuclear homologues were situated on chromosomes 1,3 and 8, respectively. Nuclear homologues on a given chromosome were tightly linked even though they were homologous to different plasmid-like DNAs. The loci of nuclear homologues found commonly in two or three cultivars were found to be highly conserved, a result that is consistent with their stable transmission. These results and those of the Southern analysis suggest the independent integration of these sequences during the varietal differentiation of rice. The concentration of loci for nuclear homologues on chromosomes 1 and 8 suggests that these sequences were integrated non-randomly into these chromosomal regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221881
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  • 5
    Electronic Resource
    Electronic Resource
    Composite and clinal distribution of Glycine soja in Japan revealed by RFLP analysis of mitochondrial DNA (1998)
    Springer
    Theoretical and applied genetics 96 (1998), S. 170-176 
    Details
    ISSN: 1432-2242
    Keywords: Key words Wild soybean ; Glycine soja ; RFLP ; Mitochondrial DNA ; Geographic distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Wild soybean (Glycine soja Sieb. et Zucc.), regarded as the progenitor of cultivated soybean [G. max (L.) Merr.], is widely distributed in East Asia. We have collected 1097 G. soja plants from all over Japan and analyzed restriction fragment length polymorphisms (RFLPs) of mitochondrial DNA (mtDNA) in them. Based on the RFLPs detected by gel-blot analysis, using coxII and atp6 as probes, the collected plants were divided into 18 groups. Five mtDNA types accounted for 94% of the plants examined. The geographic distribution of mtDNA types revealed that, in many regions, wild soybeans grown in Japan consisted of a mixture of plants with different types of mtDNA, occasionally even within sites. Some of the mtDNA types showed marked geographic clines among the regions. Additionally, some wild soybeans possessed mtDNA types that were identical to those widely detected in cultivated soybeans. Our results suggest that the analysis of mtDNA could resolve the maternal lineage among plants of the genus Glycine subgenus Soja.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050724
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