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  • 1
    Electronic Resource
    Electronic Resource
    Genetic length and interference in telo-substituted interchange heterozygotes of rye (1973)
    Springer
    Chromosoma 42 (1973), S. 95-104 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Substituting one of the (sub)metacentric chromosomes of a simple interchange complex by the two corresponding telocentrics marks one of the unchanged arms, one of the interchange segments and one of the interstitial segments. When the two telocentrics can be distinguished and when only infrequently MI configurations are formed for which more than a single origin is possible, rather exact estimates of the frequency of occurrence of chiasmata in the six segments can be obtained. When the two telocentrics can not be distinguished and in addition the frequency of MI configurations with more than one possible origin is not negligible, the analysis is more complex. With some previous knowledge of the interchange and some simplification an acceptable simple solution remains possible. — Of both cases an example for rye, Secale cereale, is given, together with an analysis of interference between these segments, and a conversion of probabilities of being bound at MI to genetic length.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326333
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructure and histochemistry of Citrus limon (L.) stigma (1982)
    Springer
    Planta 156 (1982), S. 1-9 
    Details
    ISSN: 1432-2048
    Keywords: Citrus ; Development (stigma) ; Exudate (stigmatic) ; Stigma (histochemistry, ultrastructure)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Citrus limon has a “wet” stigma which can be divided in two zones: a glandular superficial one formed by papillae, and a non-glandular one formed by parenchymatic cells. The stigmatic exudate is produced by the papillae after the latter have reached their ultimate size. The papillae of the mature pistil are of varying size and composition. Both the unicellular and multicellular ones are present. The cells at the base of the papillae are rich in cytoplasm, whereas the tip cells are vacuolated. Histochemical analysis has shown that the exudate of Citrus is composed of lipids, polysaccharides, and proteins. Our results indicate that the lipidic component is produced and secreted first, followed by production and secretion of the polysaccharidic component. The lipidic component of the exudate is produced in the basal papillae cells and accumulates as droplets in dilated parts of the smooth endoplasmic reticulum (SER). Subsequently the lipid droplets are transported to the plasma membrane, and transferred by the latter into the cell walls. Then the exudate component is accumulated in the intercellular spaces and in the middle lamellar regions of the walls. Subsequently, the polysaccharidic component of the exudate is produced and secreted by the tip cells of the papillae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393436
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Abscission and seed shattering in perennial ryegrass (Lolium perenne L.) (1988)
    Springer
    Euphytica 39 (1988), S. 51-57 
    Details
    ISSN: 1573-5060
    Keywords: Lolium perenne ; perennial ryegrass ; grass seed production ; histology ; seed retention ; seed shattering ; abscission layer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Yield in grass seed crops is decreased by seed shattering, which is generally caused by abscission. Abscission layer development in perennial ryegrass, Lolium perenne L., was investigated to determine its histogenesis in relation to the morphological stages of the inflorescence. Spikelets were fixed with weekly intervals from heading to harvest ripeness. Florets were dissected and microtome sectioned. Abscission layers were located in the rachilla just below each floret. They were already present at the heading stage. Only slight histological changes were observed in the cells of the abscission layers during flowering and seed development. Breaking of the abscission layers occurred four to five weeks after anthesis, starting at the epidermis. No degradation of the abscission layer cells was detected, indicating that abscission took place mechanically. No histological differences in abscission mechanism were found between groups of genotypes with contrasting seed retention, suggesting that in our material differences in seed retention were probably caused by morphological factors other than abscission layer development. Selection for high seed retention is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00043367
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    Paper (German National Licenses)
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