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  • 1
    Digitale Medien
    Digitale Medien
    Solute distribution in Suaeda maritima (1983)
    Springer
    Planta 157 (1983), S. 344-349 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Glycinebetaine ; Ion, inorganic (distribution) ; Salt tolerance ; Shoot (solutes) ; Solute distribution ; Suaeda
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The distribution of sodium, potassium and glycinebetaine in shoot tissues of salt-treated Suaeda maritima was examined by semi-micro techniques after extraction into toluene-water. Much higher K/Na ratios were observed in the apical regions and in axillary buds than in more mature, fully vacuolated tissues. The younger tissues also contained very high levels of glycinebetaine. Electron-probe X-ray microanalysis of bulkfrozen and fractured preparations showed higher K/Na ratios and higher levels of sulphur and phosphorus in the cytoplasm of leaf primordial cells than in vacuoles of either young or old leaves, although the total counts were higher in the vacuolar samples. The results are discussed in relation to current models of subcellular solute compartmentation and salt tolerance in the Chenopodiaceae.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00397406
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  • 2
    Digitale Medien
    Digitale Medien
    Cytogenetics of Lolium perenne (1983)
    Springer
    Theoretical and applied genetics 65 (1983), S. 149-156 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Lolium perenne ; Meiosis ; Chiasma distribution ; U-type exchange
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary In two contrasting types of S5 inbred Lolium perenne a correlation has been found between the distribution pattern of chiasmata within bivalents and that of meiotic U-type exchange. The relationship between the two processes is discussed, in terms of inbreeding effects upon chiasma redistribution, and mention is also made of some other types of chromosome breakages which arise following enforced self-pollination.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00264883
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  • 3
    Digitale Medien
    Digitale Medien
    Cytogenetics of Lolium perenne (1983)
    Springer
    Theoretical and applied genetics 64 (1983), S. 137-145 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Lolium perenne ; Inbred lines ; Meiosis ; Chiasma distribution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary An analysis of the patterns of chiasma distribution within bivalents, in a number of inbred lines of Lolium perenne, reveals a striking potential for variation in this character, as well as a polygenic genetic basis for its control. In parent plants the chiasmata have a regular pattern of localisation which restricts their formation to the ends of the chromosome arms: this strict localisation is progressively lost with inbreeding and novel patterns of distribution are found where chiasmata occur in more interstitial and proximal regions. The variation is continuous and originates from genotypic differences between the different parent plants, rather than from segregation among families deriving from individual parents.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00272721
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  • 4
    Digitale Medien
    Digitale Medien
    Cytogenetics of Lolium perenne (1982)
    Springer
    Theoretical and applied genetics 62 (1982), S. 177-183 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Lolium perenne ; Inbred lines ; Meiosis ; Chiasmata
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary A number of inbred lines of Lolium perenne have been developed as far as the fifth inbred generation and are being used for basic studies on the cytogenetics of the species. An analysis on variation in the pattern of chiasma frequency and distribution, including the parent plants and all generations down to the S5, reveals that the effect of inbreeding is to reduce chiasma frequency and to increase both the cell and bivalent variances. Evidence is presented for a genetic basis of polygenic control of chiasma formation and distribution, and a model is suggested for control over the three related components of variation which involves a two-stage level of regulation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00293355
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