Article Abstract:
Cytoplasmic male sterility (CMS) is required to produce F1 hybrid grain sorghum. The sorghum line IS1112C has a male sterility-inducing cytoplasm when introduced into nuclear background without fertility restoration genes. The formation of orf107, a chimeric open reading frame, results from an mtDNA chimeric configuration. Orf107 transcription is driven by three promoters; and fertility restoration is exacted via a unique two-gene gametophytic system, requiring the action of Rf3 and Rf4 genes. It is possible that Rf4 may confer the restitution of normal editing frequency.
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Article Abstract:
Plant mitochondria show marked differences in genome size, recombinational activity, organization and gene expression, compared to fungal and animal counterparts. Recent research demonstrating the way in which the pvs-orf239 mitochondrial mutation in cytoplasmic male sterility (CMS) common bean is suppressed by nuclear-directed mechanisms, is summarized. This requires mitochondrial genomic shifts in relative DNA copy number, and mapping evidence supports the hypothesis of pvs-orf239 retention.
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Article Abstract:
Details regarding gene structure and expression of the petunia CMS-associated fused gene (pcf) locus and its fertile homologues in Petunia, are reported. The cytoplasmic male sterility (CMS)-associated region of Petunia seem to carry novel recombinant genes, possibly created by unusual spontaneous recombination events. Restorer genes may occur due to recognition of a sequence in the DNA, RNA or protein product of a novel mitochondrial gene.
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