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... The occurrence of very-low-fluence responses (VLFR), low-fluence responses (LFR) and high-irradiance responses (HIR) of phytochrome was investigated for the expression of the gene of β-glucuronidase (gusA) under the control of the tobacco Lhcb1*2 promoter, in etiolated transgenic tobacco seedlings. The activity of β-glucuronidase (GUS) showed biphasic responses to the calculated proportion of Pf ...
... Genetically transformed barley was produced by cocultivating immature embryo explants with Agrobacterium tumefaciens carrying a binary vector coding for chimaeric bacterial genes, bar and gus, and selecting for bialaphos-resistant cultures from which plants were regenerated. Integration of both genes was confirmed by gel blot hybridization analysis of DNA from the transformed plants and their prog ...
... Plants of the Apocynaceae family produce a wide range of terpenoid indole alkaloids (TIAs) which have important pharmaceutical applications. Studies of the molecular mechanisms controlling TIA biosynthesis may eventually provide possibilities to improve product yield by genetic modification of plants or cell cultures. However, these studies suffer from the lack of transformation/regeneration proto ...
... Although the introduction of foreign genes into Arabidopsis has become routine, the production of transgenic Arabidopsis plants still requires several months. A transgene expression system (TES) has been developed that allows characterization of gene expression patterns and the effects of foreign genes in the Arabidopsis root in 2-4 weeks. The method is based on regeneration of stably transformed ...
... Phosphoenolpyruvate carboxylase (PEPC) plays a crucial role in the assimilation of CO2 during symbiotic N2 fixation in legume root nodules. In this study, an alfalfa PEPC gene (PEPC-7), whose transcripts are found at elevated levels in nodules relative to either leaves or roots, has been isolated and characterized. The intron/exon structure of this gene is identical to that of most other plant PEP ...
... The Arabidopsis thaliana MALE STERILITY 2 (MS2) gene product is involved in male gametogenesis. The first abnormalities in pollen development of ms2 mutants are seen at the stage in microsporogenesis when microspores are released from tetrads. Expression of the MS2 gene is observed in tapetum of wild-type flowers at, and shortly after, the release of microspores from tetrads. The MS2 promoter cont ...
... Based on homologies between the yeast DMC1 and the lily LIM15 meiosis-specific genes, degenerate PCR primers were designed that amplified the Arabidopsis DMC1 gene (AtDMC1). AtDMC1 genomic DNA (8 kb) was sequenced, and the transcript was characterized by reverse transcriptase-polymerase chain reaction (RT-PCR) and by 5' and 3' RACE (rapid amplification of cDNA ends). The AtDMC1 gene contains 15 ex ...
... Transgenic barley plants were produced by the direct delivery of plasmid DNA into isolated microspores of barley cv. Igri using high velocity microprojectiles. The plasmid pAHC25 contained the uidA and bar genes, each under the control of a maize Ubi1 promoter. Bombarded microspores were cultured and selected on solid medium containing varying concentrations (2-5 mg/L) of the Basta herbicide activ ...
... The promoters of the hemoglobin genes from the nitrogen-fixing tree Parasponia andersonii and the related nonnitrogen-fixing Trema tomentosa both confer beta-glucuronidase reporter gene expression to the central zone of the nodules of a transgenic legume, Lotus corniculatus. beta-Glucuronidase expression was high in the uninfected interstitial cells and parenchyma of the surrounding boundary layer ...
... Previous micro-injection studies showed that some recombinant viral movement proteins and plant proteins produced in and purified from Escherichia coli could traffic from cell to cell. However, the relevance of these findings obtained by micro-injecting proteins produced in E. coli to the real functions of these proteins when produced in planta has been questioned. In this study, specific gene con ...
... It has been demonstrated that the carboxyl terminus of microbody enzymes functions as a targeting signal to microbodies in higher plants. We have examined an ability of 24 carboxy-terminal amino acid sequences to facilitate the transport of a cytosolic passenger protein, beta-glucuronidase, into microbodies in green cotyledonary cells of transgenic Arabidopsis. Immunoelectron microscopic analysis ...
... Ran, a small soluble GTP-binding protein, has been shown to be essential for the nuclear translocation of proteins and it is also thought to be involved in regulating cell cycle progression in mammalian and yeast cells. Genes encoding Ran-like proteins have been isolated from different higher plant species. Overexpression of plant Ran cDNAs, similarly to their mammalian/yeast homologues, suppresse ...
Nicotiana tabacum; transgenic plants; cytoplasm; active transport; molecular weight; amino acid sequences; plant proteins; cytochemistry; spatial distribution; leaves; beta-glucuronidase; enzyme activity; animal proteins; Scyphozoa; green fluorescent protein; Aequorea victoria
Abstract:
... The soluble proteins of the nucleoplasm are synthesized on cytoplasmic ribosomes. Proteins larger than about 40 kDa are post-translationally targeted to the nucleus via energy-dependent processes, passing through the nuclear pore complex into the nucleoplasm. Targeting involves nuclear localization signals (NLSs) found within the primary sequences of the imported proteins. In higher plants, inform ...
... Stem sections from poplar that were stably transformed with a eucalypt cinnamyl alcohol dehydrogenase promoter-beta-glucuronidase construct were prepared by using either a technique routinely used in herbaceous species or a technique designed to take into account the particular anatomy of woody plants. Although both preparation techniques confirmed the pattern of expression previously observed (C. ...
... A genomic clone encoding ascorbate oxidase was isolated from pumpkin (Cucurbita sp.). This gene is consisted of four exons and three introns. Analyses of the promoter fusion to beta-glucuronidase reporter gene by transient expression assay in pumpkin fruit tissues suggested the existence of a cis-acting region responsible for auxin regulation. ...
... A strain of non‐pathogenic Fusarium oxysporum Schlecht. emend, Snyd. & Hans. has been selected for its capacity to reduce the incidence of Fusarium wilt of tomato. Among the possible modes of action of this strain, competition with the pathogen for the colonization of the root surface and tissues has been proposed. In order to study the pattern of root colonization, young Lycopersicon etculentum M ...
... To investigate the role of salicylic acid (SA) in the hypersensitive response (HR) its accumulation was compromised during different phases of lesion development by differential expression of a salicylate hydroxylase gene (SH-L). Constitutive suppression of SA accumulation was achieved by expression of a gene fusion between the CaMV35S promoter (35S) and SH-L. Using the H2O2-responsive AoPR1 promo ...
... We have previously shown that the proximal promoter region (-185 to +57) of the wheat histone H3 gene (TH012) is sufficient for regulating S phase-expression of a reporter GUS gene. To define the cis-acting element(s) responsible for S phase-specific expression, GUS fusion genes under the control of wild-type or variously mutated H3 promoters were stably introduced into cultured rice Oc cells and ...
... The plant pathogen Botrytis cinerea can infect undamaged plant tissue directly by penetration of the cuticle. This penetration has been suggested to be enzyme-mediated, and an important role for cutinase in the infection process has been proposed. In this study the expression of the cutinase encoding gene cutA of B. cinerea was analyzed using a cutA promoter-GUS reporter gene fusion. Transformants ...
... Extracts of cranberry, rich in flavonols and proanthocyanins, inactivated beta-glucuronidase (GUS) in assays using either purified bacterial GUS or preparations of transgenic tobacco (Nicotiana tabacum L.) or transgenic cranberry (Vaccinium macrocarpon Ait.) expressing the gusA gene. Histochemical GUS assays produced random and generally unpredictable staining. The addition of polyvinylpolypyrroli ...