The Use of Plastid and Gene Mutants of Higher Plants in Studying the Genetic Control of Plastid Functions

Hagemann, Rudolf; Börner, Th.

doi:10.1007/978-94-010-1936-1_10

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“…Previously described PSI-less mutants (6,8,10,11,16,17,36) were nonnuclear mutations. The ones described here and elsewhere (6) are nuclear mutants.…”

Section: Methodsmentioning

confidence: 99%

“…With one exception (6), these mutants were the result of extranuclear or plastome mutations (6,11,17,36). A second group of Chl-deficient mutants exhibit a severe reduction or loss of LHCP, and with one exception 'This work was supported by National Science Foundation Grant PCM 76-08831 to CDM, National Science Foundation Grant PCM 75-20252 to JPT, and United States Department of Agriculture Grant 5901-0410-8-0123-0 to CDM.…”

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confidence: 99%

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Effect of Nuclear Mutation in Maize on Photosynthetic Activity and Content of Chlorophyll-Protein Complexes

Miles¹,

Markwell²,

Thornber³

1979

Plant Physiol.

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A number of new nuclear mutants have been isolated from maize by selection for high chlorophyll (Chl) fluorescence. These mutants show reduced rates of photosynthesis and/or are deficient in Chli. Electrophoretic examination of wild type thylakoid membranes revealed five Chi-protein complexes, two containing only Chi a and three containing Chli a and Chi b. A class of nonviable, photosystem I-deficient mutants was found to be lacking one (A-1) of the two Chl a-protein complexes. A second class of nonviable, photosystem I-lacking mutants was found to be missing not only this A-1 complex but also one or more of the three Chi a and b-containing, light-harvesting Chl-protein complexes. Viable mutants were obtained which appeared to have lost just one of the Chi b-containing complexes, whereas a second class of viable mutants was missing all three of the Chi b-complexes. The results confirm that the A-1 band is associated with the P700-Chl a-protein complex characterized previously. The data also indicate the existence of structurally different forms of the light-harvesting Chi a-and b-containing complexes. The results also show a lower molecular weight band (A-2) containing primarily Chi a and which appears to be required for viability.

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“…Previously described PSI-less mutants (6,8,10,11,16,17,36) were nonnuclear mutations. The ones described here and elsewhere (6) are nuclear mutants.…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%