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  • Articles: DFG German National Licenses  (2)
  • Adenylate cyclase  (1)
  • Canopy filtered light  (1)
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  • Articles: DFG German National Licenses  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The effect of canopy filtered light on the growth of white clover Trifolium repens (1987)
    Springer
    Oecologia 72 (1987), S. 372-376 
    Details
    ISSN: 1432-1939
    Keywords: High quality ; shade ; Photomorphogenesis ; Canopy filtered light ; Trifolium repens
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Plants of white clover (Trifolium repens) were grown under canopies of clover leaves floating on shallow glass tanks of water and their growth was compared with that of plants under canopies of black polythene ‘leaves’. The experimental design allowed the growth of the clover plants in canopy filtered light to be compared with that in unfiltered light at different intensities of Photosynthetically Active Radiation (P.A.R.). The effect of canopy filtered light was to exaggerate the effects of reduced P.A.R. especially in promoting petiole extension and inhibiting stolon branching. Two clones of white clover differed in their responses to P.A.R. and to light quality and there were significant interactions between the effects of the intensity of P.A.R. and type of shade. It is argued that it may be important for both ecologists and plant breeders to recognise the role of radiation quality in regulating the dynamics of pasture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377566
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Temperature conditional cAMP-requiring mutant strains ofChlamydomonas reinhardtii arrest in G1 and are rescued by added cAMP (1996)
    Springer
    Protoplasma 192 (1996), S. 159-167 
    Details
    ISSN: 1615-6102
    Keywords: Adenylate cyclase ; Cell cycle ; Chlamydomonas reinhardtii ; Cyclic AMP ; Cyclic nucleotide phosphodiesterase ; Mutant strains
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Three independent isolates ofChlamydomonas, selected for caffeine resistance, were found to arrest in G1 phase, as determined by quantitative fluorescence measurements of DNA, when grown at a non-permissive temperature. This cell cycle arrest correlated with lowered levels of cAMP and of adenylate cyclase activity. The arrested cells could be rescued by added cAMP but not AMP, hence the defect was not one of general purine metabolism. Back-crosses to wild type revealed that the phenotypes observed result from a combination of three separable mutations. It is clear that the mutations define functions that are more stringently required for cell division than for growth since the mutant strains are able to grow up to fifteen times normal size while blocked at the non-permissive temperature. The possible interaction of cAMP dependent events with division is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01273888
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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