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Plant Physiology 65:1108-1110 (1980)
© 1980 American Society of Plant Biologists

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Articles

Biochemical Studies on the Iojap Mutant of Maize

Anke Siemenroth, Thomas Börner and Ulrich Metzger1

Department of Genetics, Martin Luther University, DDR-402 Halle/S., Domplatz 1, German Democratic Republic, Section Biosciences, Martin Luther University, DDR-402 Halle/S., Domplatz 1, German Democratic Republic

The white leaf tissue of seedlings of Zea mays L. affected by the recessive nuclear gene iojap shows no photosynthetic activity; it contains about 1.4% of carotenoid and less than 0.1% of chlorophyll a content of normal green tissue. Neither fraction I protein nor chloroplast adenosine triphosphatase (EC 3.6.1.4) (CF1) is detectable. This confirms earlier observations that plastids of white sectors of iojap maize do not contain ribosomes. About 40% of the activity of phosphoenolpyruvate carboxylase (EC 4.1.1.31) in green leaves could be found in white leaves indicating that the phosphoenolpyruvate carboxylase EC 4.1.1.31 is made on cytoplasmic ribosomes. The oxygen consumption of iojap-affected leaves is decreased.

1 Department of Plant Physiology, Section Biosciences, Martin Luther University, DDR-402 Halle/S., Am Kirchtor 1, German Democratic Republic.






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Copyright © 1980 by the American Society of Plant Biologists