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Partial demethylation of oligogalacturonides by pectin methyl esterase 1 is required for eliciting defence responses in wild strawberry (Fragaria vesca).

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In addition to the role of the cell wall as a physical barrier against pathogens, some of its constituents, such as pectin-derived oligogalacturonides (OGA), are essential components for elicitation of defence responses. To investigate how modifications of pectin alter defence responses, we

Functional expression of an ajmaline pathway-specific esterase from Rauvolfia in a novel plant-virus expression system.

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Acetylajmalan esterase (AAE) plays an essential role in the late stage of ajmaline biosynthesis. Based on the partial peptide sequences of AAE isolated and purified from Rauvolfia cell suspensions, a full-length AAE cDNA clone was isolated. The amino acid sequence of AAE has the highest level of

Role of a GDSL lipase-like protein as sinapine esterase in Brassicaceae.

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The seeds of most members of the Brassicaceae accumulate high amounts of sinapine (sinapoylcholine) that is rapidly hydrolyzed during early stages of seed germination. One of three isoforms of sinapine esterase activity (BnSCE3) has been isolated from Brassica napus seedlings and subjected to

Inactive methyl indole-3-acetic acid ester can be hydrolyzed and activated by several esterases belonging to the AtMES esterase family of Arabidopsis.

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The plant hormone auxin (indole-3-acetic acid [IAA]) is found both free and conjugated to a variety of carbohydrates, amino acids, and peptides. We have recently shown that IAA could be converted to its methyl ester (MeIAA) by the Arabidopsis (Arabidopsis thaliana) enzyme IAA carboxyl

Molecular interactions between the specialist herbivore Manduca sexta (Lepidoptera, Sphigidae) and its natural host Nicotiana attenuata. VIII. An unbiased GCxGC-ToFMS analysis of the plant's elicited volatile emissions.

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Treating wounds in Nicotiana attenuata leaves with Manduca sexta oral secretions (W+OS) mimics most changes elicited by M. sexta herbivory, but an unbiased analysis of the effect of the different OS constituents on volatile emissions is lacking. We used two-dimensional gas

Enrichment for Nicotiana heterokaryons after protoplast fusion and subsequent growth in agarose microdrops.

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Protoplasts isolated from Nicotiana tabacum L. leaves and Nicotiana suaveolens Lehm. cell suspensions have been fused with polyethylene glycol (PEG). Enrichment for heterokaryons was based on a Percoll flotation protocol which allowed a preparation with 50% heterokaryons to be obtained. The

Transmission genetics of the somatic hybridization process in Nicotiana : 1. Hybrids and cybrids among the regenerates from cloned protoplast fusion products.

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Callus protoplasts of a Nicotiana tabacum chlorophyll-deficient mutant were fused with mesophyll protoplasts from one of following five sources: 4 cmsanalogs of tobacco bearing the cytoplasms of N. plumbaginifolia, N. suaveolens, N. repanda, and N. undulata, respectively, as well as wild species N.

Xylella fastidiosa subsp. pauca Strains Fb7 and 9a5c from Citrus Display Differential Behavior, Secretome, and Plant Virulence

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Xylella fastidiosa colonizes the xylem of various cultivated and native plants worldwide. Citrus production in Brazil has been seriously affected, and major commercial varieties remain susceptible to Citrus Variegated Chlorosis (CVC). Collective cellular behaviors such as biofilm formation

cDNA cloning of the 43-kDa latex allergen Hev b 7 with sequence similarity to patatins and its expression in the yeast Pichia pastoris.

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IgE-mediated hypersensitivity to latex proteins present in health care products, particularly in latex gloves, has become an important public health problem in recent years. We purified natural Hev b 7, a 43-kDa patatin-like allergen from the latex of Hevea brasiliensis and determined several

The production and characterization of a new active lipase from Acremonium alcalophilum using a plant bioreactor.

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BACKGROUND Microorganisms are the most proficient decomposers in nature, using secreted enzymes in the hydrolysis of lignocellulose. As such, they present the most abundant source for discovery of new enzymes. Acremonium alcalophilum is the only known cellulolytic fungus that thrives in alkaline

Hybrids between tobacco crown gall cells and normal somatic cells of Atropa belladonna : Isolation and characterization of cell lines.

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Protoplast fusion of Nicotiana tabacum (B6S3) crown gall cells and Atropa belladonna leaf mesophyll cells was carried out. Hybrids were selected for their capacity to grow on hormone-free media and to green in light. Shoots incapable of rhizogenesis were regenerated on the same media and grafted

Functional cybrid plants possessing a Nicotiana genome and an Atropa plastome.

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Mesophyll protoplasts of plastome chlorophyll-deficient, streptomycin-resistant Nicotiana tabacum were fused with those of wild type Atropa belladonna using the polyethylene-glycol/high Ca++/dimethylsulfoxide method. Protoplasts were cultured in nutrient media suitable for regeneration of tobacco

Heat-inducible production of beta-glucuronidase in tobacco hairy root cultures.

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The production of beta-glucuronidase (GUS) driven by the Arabidopsis small heat shock protein 18.2 promoter in liquid cultures of transgenic tobacco (Nicotiana tabacum) hairy roots is reported. Clone GD-3, showing high GUS heat induction and a moderate growth rate, was selected from 436 clones for

Identification of aneuploids in Nicotiana tabacum by isozyme banding patterns.

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A biochemical system was devised to identify aneuploids of Nicotiana tabacum. Leaf tissue from 6 nullihaploids, 4 nullisomics, and 10 monosomics was analyzed electrophoretically on slab acrylamide gels. The staining systems used were for peroxidase, esterase, superoxide dismutase, malate

Asymmetric hybridization between Nicotiana tabacum and N. repanda by donor recipient protoplast fusion: transfer of TMV resistance.

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Genetically asymmetric hybrids were recovered by fusion of Nicotiana tabacum protoplasts with irradiated protoplasts of kanamycin-resistant, nopalineproducing plants of N. repanda. Hybrid calli were selected by culture on media containing kanamycin and were regenerated. These plants were

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