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  • 1990-1994  (5)
  • Salt tolerance  (3)
  • Lolium perenne  (2)
  • General Chemistry
  • 1
    Digitale Medien
    Digitale Medien
    The presence of the enhanced K/Na discrimination trait in diploid Triticum species (1991)
    Springer
    Theoretical and applied genetics 82 (1991), S. 729 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Triticum ; K/Na discrimination ; Salt tolerance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary A number of accessions of the three species of diploid wheat, Triticum boeoticum, T. monococcum, and T. urartu, were grown in 50 mol m-3 NaCl+2.5 mol m-3 CaCl2. Sodium accumulation in the leaves was low and potassium concentrations remained high. This was not the case in T. durum grown under the same conditions, and indicates the presence in diploid wheats of the enhanced K/Na discrimination character which has previously been found in Aegilops squarrosa and hexaploid wheat. None of the accessions of diploid wheat showed poor K/Na discrimination, which suggests that if the A genome of modern tetraploid wheats was derived from a diploid Triticum species, then the enhanced K/Na discrimination character became altered after the formation of the original allopolyploid. Another possibility is that a diploid wheat that did not have the enhanced K/Na discrimination character was involved in the hybridization event which produced tetraploid wheat, and that this diploid is now extinct or has not yet been discovered.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00227318
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  • 2
    Digitale Medien
    Digitale Medien
    Genetic analysis of salt tolerance during germination in Lycopersicon (1991)
    Springer
    Theoretical and applied genetics 81 (1991), S. 321-326 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Lycopersicon esculentum ; Salt tolerance ; Seed germination ; Maternal effects ; Tomato improvement ; Gene action
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The salt-tolerant cultivated tomato (Lycopersicon esculentum) accession, ‘PI174263’, and a sensitive cv, ‘UCT5’, were crossed to develop reciprocal F1, F2 and BC1 populations for genetic analysis of salt tolerance in tomatoes during seed germination. Variation was partitioned into embryo, endosperm and maternal (testa and cytoplasmic) components. Generation means analysis indicated that there were no significant embryo (additive, dominance or epistatic) effects on germination performance under salt stress. Highly significant endosperm additive and testa dominance effects were detected. The proportion of the total variance explained by the model containing these two components was R2=98.2%. Variance component analysis indicated a large genetic variance with additive gene action as the predominant component. Furhter inspection indicated that this variance was attributable to endosperm additive effects on germinability under salt stress. Narrow-sense heritability was estimated as moderately high. Implications for breeding procedures are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00228671
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  • 3
    Digitale Medien
    Digitale Medien
    Mapping salt-tolerance genes in tomato (Lycopersicon esculentum) using trait-based marker analysis (1993)
    Springer
    Theoretical and applied genetics 87 (1993), S. 184-192 
    Details
    ISSN: 1432-2242
    Schlagwort(e): Tomato ; Salt tolerance ; Seed germination ; Isozyme markers ; QTL mapping
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The germination responsiveness of an F2 population derived from the cross Lycopersicon esculentum (UCT5) x L. pennellii (LA716) was evaluated for salt tolerance at two stress levels, 150 mM NaCl + 15 mM CaCl2 and 200 mM NaCl + 20 mM CaCl2. Individuals were selected at both tails of the response distribution. The salt-tolerant and salt-sensitive individuals were genotyped at 16 isozyme loci located on 9 of the 12 tomato chromosomes. In addition, an unselected (control) F2 population was genotyped at the same marker loci, and gene frequencies were estimated in both selected and unselected populations. Trait-based marker analysis was effective in identifying genomic locations (quantitative trait loci, QTLs) affecting salt tolerance in the tomato. Three genomic locations marked by Est-3 on chromosome 1, Prx-7 on chromosome 3, and 6Pgdh-2 and Pgi-1 on chromosome 12 showed significant positive effects, while 2 locations associated with Got-2 on chromosome 7 and Aps-2 on chromosome 8 showed significant negative effects. The identification of genomic locations with both positive and negative effects on this trait suggests the likelihood of recovering transgressive segregants in progeny derived from these parental lines. Similar genomic locations were identified when selection was made either for salt tolerance or salt sensitivity and at both salt-stress treatments. Comparable results were obtained in uni- and bidirectional selection experiments. However, when marker allele gene frequencies in a control population are unknown, bidirectional selection may be more efficient than unidirectional selection in identifying marker-QTL associations. Results from this study are discussed in relationship to the use of molecular markers in developing salt-tolerant tomatoes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00223763
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  • 4
    Digitale Medien
    Digitale Medien
    Colchicine-induced heritable variation in cell size and chloroplast number in the leaf cells of inbred ryegrasses (Lolium perenne, L. multiflorum) (1991)
    Springer
    Euphytica 52 (1991), S. 39-45 
    Details
    ISSN: 1573-5060
    Schlagwort(e): Lolium multiflorum ; Italian ryegrass ; Lolium perenne ; perennial ryegrass ; cell size ; chloroplast number ; colchicine-induced changes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary A 3 hr period of treatment with a 0.2% aqueous solution of colchicine was given to one week old seedlings of 3 inbred lines of perennial ryegrass (Lolium perenne) and 4 lines of Italian ryegrass (L. multiflorum). The surviving plants developed as mixoploids and were self-pollinated. In the following generation (CT1) the seeds were grown without further treatment, and were screened cytologically at the seedling stage to separate out diploids from tetraploids. Only the diploids were kept, and in this CT1 generation comparisons were then made between controls (2x) and colchicine-treated diploids (C2x) for leaf mesophyll cell size and chloroplast number variation. Heritable differences were found such that the cell plan areas and/or the numbers of chloroplasts per cell were significantly greater in the C2x compared with the 2x treatment in 3 and 5 out of the 7 lines. In each case there was enhancement of chloroplast numbers independently of the variation in cell size.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00037855
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  • 5
    Digitale Medien
    Digitale Medien
    Colchicine-induced heritable variation in cell size and chloroplast numbers in leaf mesophyll cells of diploid ryegrass (Lolium perenne L.) (1990)
    Springer
    Euphytica 49 (1990), S. 49-55 
    Details
    ISSN: 1573-5060
    Schlagwort(e): Lolium perenne ; ryegrass ; colchicine ; induced heritable variation ; cell size ; chloroplast number
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Summary A 3 hr treatment period with a 0.2% aqueous solution of colchicine was given to one week old seedlings of imbred lines of perennial ryegrass (Lolium perenne L.). The surviving plants developed as mixoploids and were subsequently split down into single tillers and then classified as either diploid or tetraploid. The undoubled diploids of the treated material (C2x) were then self-pollinated and the seeds grown in the following generation (CT1) without any further treatment. In the CT1 generation comparisons were made between the C2x and the control 2x treatments within the same inbred lines, and heritable differences were found for leaf mesophyll cell plan areas and chloroplast numbers. The cell areas were significantly less in the C2x compared with the 2x treatment in four out of the five lines studied, and the chloroplasts numbers were likewise lower in two out of the five lines. In one line there was a significantly higher mean number of chloroplasts per cell in the C2x material compared with that of the 2x.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00024130
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