A unique two-gene gametophytic male sterility system in sorghum involving a possible role fo RNA editing in fertility restoration

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.

Sorghum

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Mitochondrial gene organization and expression in petunia male fertile and sterile plants

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.

Plant mitochondria, Petunia

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