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Plant Physiology 64:690-694 (1979)
© 1979 American Society of Plant Biologists

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Articles

Effect of Nuclear Mutation in Maize on Photosynthetic Activity and Content of Chlorophyll-Protein Complexes 1

C. Donald Miles, John P. Markwell2 and J. Philip Thornber2

a Division of Biological Science, University of Missouri, Columbia, Missouri 65211

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 Chl. Electrophoretic examination of wild type thylakoid membranes revealed five Chl-protein complexes, two containing only Chl a and three containing Chl a and Chl 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 Chl a and b-containing, light-harvesting Chl-protein complexes. Viable mutants were obtained which appeared to have lost just one of the Chl b-containing complexes, whereas a second class of viable mutants was missing all three of the Chl 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 Chl a- and b-containing complexes. The results also show a lower molecular weight band (A-2) containing primarily Chl a and which appears to be required for viability.

2 Address: Department of Biology and Molecular Biology Institute, University of California, Los Angeles, California 90024.

1 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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Copyright © 1979 by the American Society of Plant Biologists