Stockmeyer, K. and Pring, D.R. and Kempken, F.
(2007)
Heterologous expression of the cytoplasmic male sterility associ-ated orf107 from Sorghum bicolor in Arabidopsis thaliana.
Endocytobiosis Cell Research, 18.
pp. 11-23.
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Abstract
Unique chimeric mitochondrial genes are as-sociated with cytoplasmic male sterility (CMS) in many higher plants. It is thought that disrup-tion in pollen development is a consequence of mitochondrial dysfunction associated with these chimeric genes. The IS1112C source of Sorghum bicolor CMS contains the chimeric mitochondrial open reading frame orf107, which exclusively is present in that cytoplasm. To analyse the effect of a chimeric mitochon-drial gene on mitochondrial gene expression and pollen development, we introduced the CMS-associated mitochondrial orf107 from S. bicolor into the Arabidopsis thaliana nuclear genome and expressed it, by the use of differ-ent flower-, or anther-specific promoters. The functionality and specificity of these promoters was demonstrated through histochemical GUS-staining. Expression of ORF107 was analysed by RT-PCR and biotinylation. Mito-chondrial import was confirmed employing GFP-fusion experiments. Constitutive as well as flower-specific expression of orf107 fused to the yeast coxIV mitochondrial inner mem-brane targeting presequence or the Nicotiana plubaginifolia atp2-1 matrix-targeting signal revealed no deleterious effect on pollen de-velopment. T1 plants from primary transfor-mants also showed normal pollen develop-ment. These data suggest that there is no effect of the ORF107 protein on male fertility in A. thaliana.
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