GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Phototropin-related NPL1 controls chloroplast relocation induced by blue light (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 410 (2001), S. 952-954 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In photosynthetic cells, chloroplasts migrate towards illuminated sites to optimize photosynthesis and move away from excessively illuminated areas to protect the photosynthetic machinery. Although this movement of chloroplasts in response to light has been known for over a century, the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35073622
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Ion antagonism in phytochrome-mediated calcium-dependent germination of turions of Spirodela polyrhiza (L.) Schleiden (1999)
    Springer
    Planta 208 (1999), S. 583-587 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Calcium ; Germination ; Phytochrome ; Signal transduction ; Spirodela (germination) ; Turion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The light-dependent germination response of turions (resting fronds) is mediated by phytochrome and requires the presence of Ca2+ in the medium (K.-J. Appenroth and H. Augsten, 1990, Photochem. Photobiol. 52: 61–65). The Ca2+ requirement of germination is apparent only in the presence of exogenous Mg2+. A competitive ion antagonism was demonstrated between Ca2+ and Mg2+ in this physiological response; Mg2+ could also be replaced by Ba2+ or Sr2+. Without exog-enous Mg2+, a Ca2+ concentration as low as 0.9 μM fulfilled the Ca2+ requirement. This type of ion antagonism resembled the competitive Ca/Mg interaction reported previously for calcium-binding proteins. The physiological response was blocked by inhibitors of Ca2+ uptake (verapamil, La3+). It was concluded that uptake of Ca2+ from the external medium is an essential step in the phytochrome-mediated germination of turions. The results are in agreement with the assumption that the uptake of Ca2+ is blocked at the side of entry by other alkaline earth ions. Treatment of turions with Mg2+ (1 mM) for 24 h at varying times after the red light pulse in otherwise virtually Ca2+-free KNO3 solution resulted in a response similar to a Ca2+ step-down treatment. This is in agreement with the assumption that the Ca2+- and the Mg2+-sensitive periods coincide. The ion interaction described here represents the first photophysiological example in plants of an antagonistic effect between Ca2+ and Mg2+ similar to that which occurs in vitro with calmodulin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050596
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Influence of calcium on blue-light-induced chloroplast movement in Lemna trisulca L. (1993)
    Springer
    Planta 189 (1993), S. 491-498 
    Details
    ISSN: 1432-2048
    Keywords: Blue light ; Calcium ; Calcium ionophore ; Chloroplast movement ; Lemna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The presence of calcium is essential for chloroplast movement induced by blue light in Lemna trisulca L. The regulatory role of calcium was confirmed by the inhibition of chloroplast movement by cytochalasin B and trifluoperazine. The calcium concentration in tissues was modified by ethylene glycol-bis(2-aminoethylether)-N,N,N′, N′-tetraacetic acid (EGTA), the calcium ionophore A23187 and La3+. Only a long period of incubation (12h) in EGTA or La3+ caused distrubances in chloroplast movement. This indicates that calcium influx is not essential for chloroplast movement. Those conditions that dramatically changed the internal calcium concentration, either applications of calcium ionophore A23187 and EGTA, or ionophore and La3+, markedly decreased the amplitude of response to blue-light pulses. This demonstrates that disturbances of chloroplast movement are observable only when internal stores of calcium are affected by Ca2+-antagonists. We suggest that the calcium involved in blue-light-induced chloroplast movement is derived from intracellular stores. The addition of Mg2+ to EGTA buffer counteracted its effect, indicating that Mg2+, as well as Ca2+, might possibly be involved in chloroplast movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00198211
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Blue-light-induced chloroplast orientation in Mougeotia. Evidence for a separate sensor pigment besides phytochrome (1984)
    Springer
    Planta 160 (1984), S. 21-24 
    Details
    ISSN: 1432-2048
    Keywords: Blue light (chloroplast orientation) ; Chlorophyta (chloroplast orientation) ; Chloroplast orientation ; Mougeotia (phytochrome) ; Phytochrome (chloroplast orientation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chloroplast orientation in the green alga Mougeotia has been induced by unidirectional red or blue light, given continuously during one hour. In addition, part of the preparations obtained scattered strong far-red light simultaneously with the orienting light. This far-red light completely abolished the response to red light, consistent with phytochrome as the sensor pigment for orientation in Mougeotia. In blue light, however, the response was completely insensitive to far-red light, thus pointing to a different sensor pigment in the shortwavelength region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392461
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...