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'Gerontoplast' in keywords Facet   Publication Year 1988  [X]
Facet   section ZfN Section C  [X]
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1988[X]
1Author    H.Oskar SchmidtRequires cookie*
 Title    The Structure and Function of Grana-Free Thylakoid Membranes in Gerontoplasts of Senescent Leaves of Vicia faba L  
 Abstract    In the course of yellowing (senescence) the leaves of Vicia faba L. lose 95% of their chlorophyll. Gerontoplasts develop from chloroplasts and aggregate with the pycnotic mitochon-dria and the cell nucleus in the senescent cells (organelle aggregation). The gerontoplasts contain only a few, unstacked thylakoid membranes but a large number of carotinoid-containing plasto-globuli, which after the degration of chlorophyll presumably assume the light protection of the cells. The thylakoid membranes of the gerontoplasts were isolated by means of a flotation method. Their polypeptide composition is characterized by a high proportion of light-harvesting complex. Evidence of relatively high photochemical activity shows that functional thylakoid mem-branes are present in the premortal senescence state of leaves and this suggests that there is functional compartmentation of the hydrolytic processes in this stage of the leaves' development. 
  Reference    Z. Naturforsch. 43c, 149—154 (1988); received March 11/September 7 1987 
  Published    1988 
  Keywords    Senescence, Chloroplast, Gerontoplast, Thylakoid Membrane Proteins, Electronmicroscopy, Photosynthesis 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0149.pdf 
 Identifier    ZNC-1988-43c-0149 
 Volume    43