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  • 1
    Electronic Resource
    Electronic Resource
    Studies on isolated starch-containing (Vicia faba) and starch-deficient (Allium cepa) guard cell protoplasts (1978)
    Springer
    Planta 143 (1978), S. 33-39 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid ; Allium ; Fusicoccin ; Guard cell protoplasts ; Vicia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Guard cell protoplasts from starch-containing Vicia faba and starch-deficient Allium cepa stomata were isolated, stabilized and recovered with an efficiency — in relation to the potential yield — of approx. 62% and 77%, respectively. In vitro, guard cell protoplasts (GCP) respond to abscisic acid and fusicoccin by respectively contracting and swelling, that is, decreasing or increasing in diameter by about 15% and more in comparison to the control. This in vitro response correlates with, but is more than 4 times as rapid as, the in vivo response of the stomata. Among the advantages presented by working with isolated GCPs are: greater sensitivity in response; freedom from influences of cuticular ridges, cell walls, subsidiary cells, and epidermal cells; and direct and parallel comparisons of starch-containing and starch-deficient GCP systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389049
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  • 2
    Electronic Resource
    Electronic Resource
    The mechanism of stomatal movement in Allium cepa L. (1977)
    Springer
    Planta 136 (1977), S. 37-43 
    Details
    ISSN: 1432-2048
    Keywords: Allium ; Cl- ions ; Epidermis ; Stomatal mechanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the guard cells of Allium cepa leaves, no starch was found either when the stomata were open or closed. The lack of other soluble polysaccharides that could be hydrolyzed during the opening reaction of the stomata (Schnabl, Planta 1977, in press) leads to the question, how is the osmotic effect, which is the basis of the stomatal movement, achieved in Allium? It is shown in this paper, by histochemical and microprobe analyses, that in Allium — as in other plant species—the K+ concentration of the guard cells increases during stomatal opening. The charges of the K+ ions in the guard cells seem to be fully compensated by imported Cl- ions. This could mean that if starch is present in the guard cells, as in the majority of plant species, its major role in the mechanism of stomatal movement is to deliver the cuunteranions for the imported K+ ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387922
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