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  • Ethylene (microtubule reorientation)  (1)
  • Germination medium  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Ethylene-induced microtubule reorientations: mediation by helical arrays (1985)
    Springer
    Planta 164 (1985), S. 439-447 
    Details
    ISSN: 1432-2048
    Keywords: Cytoskeleton ; Ethylene (microtubule reorientation) ; Helix (microtubule) ; Microtubule ; Pisum (microtubule, ethylene) ; Vigna (microtubule, ethylene)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Entire microtubule arrays, within outer cortical and epidermal cells of pea epicotyl and mung-bean hypocotyl, have been visualized by indirect immunofluorescence. In all cells the microtubule arrangement can be interpreted as being a single multistart helix of variable pitch. In control cells the predominant pattern is a tightly compressed helix with the microtubules consequently in a net transverse direction with respect to the cell axis. Occasionally some cells show an oblique helix and rare cells show a longitudinal array which may be interpreted as a steeply pitched helix. By contrast in ethylene treated tissue, many cells show net longitudinal and oblique arrays of microtubules and few show transverse arrays. Similar effects can be induced by high osmolality. It is suggested that the plant cortical cytoskeleton is an integral unit, capable of wholesale reorientation in response to environmental signals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395959
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pollen-stigma interactions in Brassica oleracea; a new pollen germination medium and its use in elucidating the mechanism of self incompatibility (1983)
    Springer
    Theoretical and applied genetics 65 (1983), S. 231-238 
    Details
    ISSN: 1432-2242
    Keywords: Brassica ; Pollen ; Pollen germination ; Germination medium ; Self incompatibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A simple medium is described which supports the germination of Brassica pollen in vitro. The method is completely reliable and the percentage germination achieved is comparable to that found on a compatible stigma. The pollen tubes produced attain lengths equal to those growing in the style and exhibit similar growth kinetics. The major difference between this medium and other less-reliable media is the addition of 1 mM Tris. The efficacy of Tris is shown to be due in part to the establishment of an optimum pH but an “amine effect” is also identified. The optimum pH for growth in vitro may be different from that encountered on the stigma. Atmospheric concentration of CO2 and pollen population density are also shown to have pronounced effects on germination in vitro. Germination in vitro is not significantly affected by prior incubation on the stigma surface. Neither crossnor self-stigmas exert any apparent influence on pollen viability in this respect. Similarly the numbers of tube initials produced in atmospheres of 98% relative humidity (RH) are not altered by such treatments. Conversely, incubation in germination medium and in 98% RH prior to pollination appears to modify pollen-stigma interactions to some extent. Stigma extracts added to the germination medium cause an increase in the rate of hydration of both cross- and self-pollen, but this effect is greater in the case of cross-pollen. Evidence for specific inhibition of self-pollen germination by stigma extracts added to the medium was not obtained. The relevance of these phenomena to current concepts of the mechanism of self incompatibility (SI) are discussed and a potential use of the medium in overcoming the SI response is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308074
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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