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Plant Cell, Vol. 11, 43-56, January 1999, Copyright © 1999, American Society of Plant Physiologists

The IMMUTANS Variegation Locus of Arabidopsis Defines a Mitochondrial Alternative Oxidase Homolog That Functions during Early Chloroplast Biogenesis

Dongying Wua,b, David A. Wrightb,c, Carolyn Wetzela, Daniel F. Voytasb,c, and Steven Rodermela,b
a Department of Botany, Iowa State University, Ames, Iowa 50011
b Interdepartmental Genetics Program, Iowa State University, Ames, Iowa 50011
c Department of Zoology and Genetics, Iowa State University, Ames, Iowa 50011

Correspondence to: Steven Rodermel, rodermel{at}iastate.edu (E-mail), 515-294-1337 (fax)

Nuclear gene–induced variegation mutants provide a powerful system to dissect interactions between the genetic systems of the nucleus–cytoplasm, the chloroplast, and the mitochondrion. The immutans (im) variegation mutation of Arabidopsis is nuclear and recessive and results in the production of green- and white-sectored leaves. The green sectors contain cells with normal chloroplasts, whereas the white sectors are heteroplastidic and contain cells with abnormal, pigment-deficient plastids as well as some normal chloroplasts. White sector formation can be promoted by enhanced light intensities, but sectoring becomes irreversible early in leaf development. The white sectors accumulate the carotenoid precursor phytoene. We have positionally cloned IM and found that the gene encodes a 40.5-kD protein with sequence motifs characteristic of alternative oxidase, a mitochondrial protein that functions as a terminal oxidase in the respiratory chains of all plants. However, phylogenetic analyses revealed that the IM protein is only distantly related to these other alternative oxidases, suggesting that IM is a novel member of this protein class. We sequenced three alleles of im, and all are predicted to be null. Our data suggest a model of variegation in which the IM protein functions early in chloroplast biogenesis as a component of a redox chain responsible for phytoene desaturation but that a redundant electron transfer function is capable of compensating for IM activity in some plastids and cells.


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