hagemann R et al. 1975
- Authors:
Hagemann R. Boerner T. Herrmann F. Knoth R.
- Title:
Use of plastome and nuclear mutants of higher plants to study the genetic
control of plastid formation and function.
- Reference location:
Soviet Journal of Developmental Biology. 5(3):236-44, 1975 May.
- Abstract:
We conducted comparative biochemical and electron-microscopic studies of
several types of plastome and nuclear mutants of Antirrhinum majus and
Pelargonium zonale. It was shown that specific blocking of the
photosynthetic reaction occurs in plastome mutants of A. majus;
Photosystem II was found to be damaged in the en:alba-1 mutant and
photo-system I was affected in the en:viridis-1 mutant. The plastid
mutations in these mutants caused loss of certain soluble lamellar
proteins and pigment--protein complexes or a reduction in their content,
which led to disappearance of photosynthetic activity. When the content of
high-molecular ribosomal RNA in the leaves of normal and mutant P. zonale
plants was compared, the normal plants were found to have four types of
RNA: two types of cytoplasmic-ribosome RNA and two types of
plastid-ribosome RNA. No plastid-ribosome RNA was detected in the mutant.
These results were confirmed by electron-microscopic examination: no
ribosomes were detected in the mutant plastids. Thus, use of plastome
mutants made it possible to establish that the genetic information
concentrated in the plastid DNA controls formation of ribosomes and
lamellae in the chloroplasts and thus affects chloroplast photosynthetic
function.
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