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Plant Physiology 66:18-24 (1980)
© 1980 American Society of Plant Biologists

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Articles

Characterization of Three Photosystem II Mutants in Zea mays L. Lacking a 32,000 Dalton Lamellar Polypeptide 1

Kenneth J. Leto2 and Donald Miles

Division of Biological Sciences, University of Missouri, Columbia, Missouri 65211

Two fully blocked and one partially blocked photosystem II nuclear mutants have been selected in Zea mays. The fully blocked mutants lack photosystem II activity, variable fluorescence, the light-inducible C-550 signal, the high potential form of cytochrome b-559, and most or all of the low potential form of the cytochrome. The block in these mutants may primarily affect the reducing side of photosystem II, inasmuch as chloroplasts isolated from both mutants exhibit an elevated F695 fluorescence emission peak. The partially blocked mutant exhibits partial photosystem II activity and a reduction, but not the total loss of the variable fluorescence yield, the C-550 signal, and the high potential form of cytochrome b-559. Lamellae isolated from the fully blocked mutants are greatly deficient for a major lamellar polypeptide with an apparent molecular weight of 32,000 daltons, whereas lamellae from the partially blocked mutant show the partial loss of this same polypeptide, suggesting that the 32,000 dalton polypeptide is necessary for the proper function of photosystem II.

2 Present address: Botany Department, University of Illinois, Urbana, Illinois 61801.

1 This research was supported by National Science Foundation Grant PCM-76 08831.




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[Abstract] [Full Text] [PDF]


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Copyright © 1980 by the American Society of Plant Biologists