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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 31 (1992), S. 99-111 
    ISSN: 1573-5079
    Keywords: Photosystem II ; plastoquinone ; QA ; QB ; transposable element
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have isolated and characterized two nuclear mutations which affect plastoquinone accumulation in maize. The mutations, hcf103 and hcf114, modify the same genetic locus. Plants homozygous for either mutant allele exhibit reduced PS II electron transport activity, reduced variable chlorophyll fluorescence and reduced delayed fluorescence yield. In these ways, hcf103 and hcf114 resemble previously described PS II mutants which lack stably assembled PS II reaction center complexes. However, unlike most previously described PS II mutants, hcf103 and hcf114 possess stable membrane-associated PS II complexes. Plastoquinone (PQ-9), which performs a variety of redox functions essential to normal non-cyclic electron transport, is severely depleted in the mutants. The lack of PS II electron transport activity is attributed to the absence of PQ-9. This is the first report of mutants deficient in PQ which do not also suffer serious pleiotropic defects.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Photosynthesis research 24 (1990), S. 81-88 
    ISSN: 1573-5079
    Keywords: CP1 ; electron transport ; hcf ; mutant ; Photosystem I ; transposable element
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthesis mutations were induced in maize lines bearing the transposable DNA element system, Mutator. Two Photosystem I mutants (hcf101 and hcf104) which were isolated are described here. Maize plants homozygous for the hcf104 mutation are seedling lethal and exhibit a high in vivo chlorophyll fluorescence yield. They lack ∼60% of CP1, P700 and PSI-specific electron transport activity relative to normal sibling plants. The comparable depletion of these three measures of PS I content conforms to the pattern reported for many other PS I-deficient mutants. Maize plants homozygous for hcf101 are seedling lethal and also exhibit high in vivo chlorophyll fluorescence yield. They lack 80–90% of CP1 and P700 but sustain steady state levels of PS I-specific electron transport activity at 70% of normal. Previous reports of similar apparent PS I hyperactivity are discussed and an explanation for the elevated steady state level of PS I electron transport activity in hcf101 is proposed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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