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Página 1 a partir de 16 resultados
Expression of a coriander desaturase results in petroselinic acid production in transgenic tobacco.
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Little is known about the metabolic origin of petroselinic acid (18:1 delta 6cis), the principal fatty acid of the seed oil of most Umbelliferae, Araliaceae, and Garryaceae species. To examine the possibility that petroselinic acid is the product of an acyl-acyl carrier protein (ACP) desaturase,
Studies on encapsidated viroid-like RNA. IV. Requirement for infectivity and specificity of two RNA components from velvet tobacco mottle virus.
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Neither the virus-like RNA (RNA 1) nor the viroid-like RNA (RNA 2) of velvet tobacco mottle virus (VTMoV) is capable of independent replication in Nicotiana clevelandii. The function of RNA 2 for the RNA 1 replication could not be fulfilled by conventional viroids such as those of chrysanthemum
Cloning and expression in Escherichia coli and Saccharomyces cerevisiae of a novel tobacco cytochrome P-450-like cDNA.
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A cDNA library constructed from poly(A)+ RNA of tobacco BY2 cells treated with 2,4-dichlorophenoxyacetic acid was screened by using a synthetic oligonucleotide corresponding to the heme binding region of avocado CYP71A1. A cloned 2-kb cDNA designated as cTBP contained an open reading frame of 1593
Phenotypic characterization of genetically distinct Phytophthora cinnamomi isolates from avocado.
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Phytophthora cinnamomi, the causal agent of Phytophthora Root Rot (PRR), is the most destructive disease of avocado worldwide. A previous study identified two genetically distinct clades of A2 mating type avocado isolates in California, however the phenotypic variation among them was not assessed.
Characterization of hsr201 and hsr515, two tobacco genes preferentially expressed during the hypersensitive reaction provoked by phytopathogenic bacteria.
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During an incompatible interaction between tobacco and the bacterial phytopathogen Pseudomonas solanacearum, 2 classes of genes, the so-called hsr (hypersensitivity-related) genes, activated preferentially during the hypersensitive reaction, and the str (sensitivity-related) genes, expressed
Characterization of ppEG1, a member of a multigene family which encodes endo-beta-1,4-glucanase in peach.
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Three cDNA clones (pCel 10, pCel 20 and pCel 30), each encoding different endo-beta-1,4-glucanases in peach, were obtained by RT-PCR and their expression investigated by northern analysis during leaf and fruit abscission and during fruit development. This analysis allowed the detection of only the
Oligomeric potato spindle tuber viroid (PSTV) RNA does not process autocatalytically under conditions where other RNAs do.
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In vitro-synthesized oligomeric linear RNAs representing the replicative intermediates of potato spindle tuber viroid (PSTV) were subjected to a large variety of in vitro conditions where self-splicing of group I introns occurs, and where self-cleavage and self-circularization of the satellite RNA
Cloning and characterization of elongation specific endo-1,4-beta-glucanase (cel1) from Arabidopsis thaliana.
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The isolation of an elongation-specific endo-1,4-beta-glucanase-cel1 from Arabidopsis thaliana was made possible by the fact that considerable homology exists between different endo-1,4-beta-glucanase (EGase) genes from different plants. Degenerate primers were synthesized based on two conserved
Evidence for a universal pathway of abscisic Acid biosynthesis in higher plants from o incorporation patterns.
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Previous labeling studies of abscisic acid (ABA) with (18)O(2) have been mainly conducted with water-stressed leaves. In this study, (18)O incorporation into ABA of stressed leaves of various species was compared with (18)O labeling of ABA of turgid leaves and of fruit tissue in different stages of
Self-cleavage of RNA in the replication of viroids and virusoids.
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Viroids are infectious, circular RNA molecules of 246 to 375 nucleotides found in plants. Virusoids are of similar size and structure but they are dependent on, and encapsidated in, a helper virus. A rolling circle mechanism of replication is considered to account for the presence of
Hen egg yolk as a source of antiviral antibodies in the enzyme-linked immunosorbent assay (ELISA): a comparison of two plant viruses.
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A method of raising antibodies against plant viruses in hen egg yolk is described. Laying hens were immunized with citrus tristeza virus (CTV) or tobacco mosaic virus-avocado isolate (TMV-A). Anti-viral antibodies in the yolks of sequentially laid eggs as well as in the serum were titrated by the
Conformational transitions in viroids and virusoids: comparison of results from energy minimization algorithm and from experimental data.
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Viroids are single-stranded circular RNA molecules of 240 to 400 nucleotides which are pathogens of certain higher plants and replicate autonomously in the host cell. Virusoids are similar to viroids in respect to size and circularity but replicate only as genomic part of a plant virus. Their
Comparison of multimeric plus and minus forms of viroids and virusoids.
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In order to investigate the mechanism of replication of viroids and virusoids, we have compared the replication intermediates of three members of each group in nucleic acid extracts of infected plants. Viroids were avocado sunblotch viroid (ASBV), citrus exocortis viroid (CEV) and coconut cadang
Involvement of the chloroplastic isoform of tRNA ligase in the replication of viroids belonging to the family Avsunviroidae.
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Avocado sunblotch viroid, peach latent mosaic viroid, chrysanthemum chlorotic mottle viroid, and eggplant latent viroid (ELVd), the four recognized members of the family Avsunviroidae, replicate through the symmetric pathway of an RNA-to-RNA rolling-circle mechanism in chloroplasts of infected
Identification of a new class of lipid droplet-associated proteins in plants.
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Lipid droplets in plants (also known as oil bodies, lipid bodies, or oleosomes) are well characterized in seeds, and oleosins, the major proteins associated with their surface, were shown to be important for stabilizing lipid droplets during seed desiccation and rehydration. However, lipid droplets
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