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The first open reading frame (ORF 1) of potato virus X (PVX) encodes a putative replicase gene. Transgenic tobacco lines expressing ORF 1 are resistant to PVX infection when inoculated with either PVX or PVX RNA. Analyses of lines containing various portions of the ORF 1 gene demonstrated that...
opaque-2 (o2) is a regulatory locus in maize that plays an essential role in controlling the expression of genes encoding the 22-kD zein proteins. Through DNase I footprinting and DNA binding analyses, we have identified the binding site for the O2 protein (O2) in the promoter of 22-kD zein...
Arabidopsis thaliana has two genes, ASA1 and ASA2, encoding the alpha subunit of anthranilate synthase, the enzyme catalyzing the first reaction in the tryptophan biosynthetic pathway. As a branchpoint enzyme in aromatic amino acid biosynthesis, anthranilate synthase has an important regulatory...
Pectin methylesterase (PME, EC 3.1.11) demethoxylates pectins and is believed to be involved in degradation of pectic cell wall components by polygalacturonase in ripening tomato fruit. We have introduced antisense and sense chimeric PME genes into tomato to elucidate the role of PME in fruit...
The ripening of many fruits is controlled by an increase in ethylene hormone concentration. E8 is a fruit ripening protein that is related to the enzyme that catalyzes the last step in the ethylene biosynthesis pathway, 1-aminocyclopropane-1-carboxylic (ACC) oxidase. To determine the function of...
Cutinase, a fungal extracellular esterase, has been proposed to be crucial in the early events of plant infection by many pathogenic fungi. To test the long-standing hypothesis that cutinase of Nectria haematococca (Fusarium solani f sp pisi) is essential to pathogenicity, we constructed...
We have determined that the synthesis of heat shock proteins is regulated ultimately at the translational level in heat-shocked carrot callus cells and somatic embryos. Polysome analysis revealed that heat-shocked callus cells do not translate most heat shock transcripts, which they abundantly...
orange pericarp (orp) is a seedling lethal mutant of maize caused by mutations in the duplicate unlinked recessive loci orp1 and orp2. Mutant seedlings accumulate two tryptophan precursors, anthranilate and indole, suggesting a block in tryptophan biosynthesis. Results from feeding studies and...
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