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Published on December 7, 2007; 10.1104/pp.107.108118

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Received August 24, 2007
Accepted December 3, 2007

The ACA10 Ca2+ ATPase Regulates Adult Vegetative Development and Inflorescence Architecture in Arabidopsis

Lynn George , Shawn M. Romanowsky , Jeffrey F. Harper , and Robert A. Sharrock

Department of Plant Sciences and Plant Pathology, Montana State University, Bozeman, MT 59717; Department of Biochemistry, University of Nevada, Reno, NV 89557

The Arabidopsis thaliana compact inflorescence (cif) genotype causes altered adult vegetative development and a reduction in elongation of inflorescence internodes resulting in formation of floral clusters. The cif trait requires both a recessive mutation, cif1, and the activity of a naturally-occurring dominant allele of an unlinked gene, CIF2D. We show here that the pseudoverticillata (psv) mutation is allelic with cif1 and that the product of the CIF1 gene is ACA10, a member of the large family of P-type Ca2+ ATPases found in higher plants. T-DNA insertion mutations in ACA10, but not in the two other Arabidopsis plasma membrane Ca2+ ATPase-encoding genes, ACA8 and ACA9, cause a cif phenotype when combined with the dominant CIF2D modifier allele. Therefore, ACA10 has a unique function in regulating adult phase growth and inflorescence development. The wild-type ACA8 and ACA10 mRNAs are present at similar levels and the two promoter-GUS fusion transgenes show very similar expression patterns. Moreover, transformation of the cif mutant with an extra copy of the ACA8 gene, which causes over-expression of the ACA8 transcript, can complement the cif phenotype. This suggests that these two Ca2+ pump genes have distinct but related activities and that their differential functions can be altered by relatively small changes in their patterns or levels of expression. The correspondence between cif1 and mutations in ACA10 establishes a genetic link between calcium transport, vegetative phase change, and inflorescence architecture.




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