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abscisic acid/tobak
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The ethylene-, jasmonate-, abscisic acid- and NaCl-responsive tomato transcription factor JERF1 modulates expression of GCC box-containing genes and salt tolerance in tobacco.
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Ethylene responsive factors (ERFs) are important plant-specific transcription factors, some of which have been demonstrated to interact with the ethylene-responsive GCC box and the dehydration-responsive element (DRE); however, data on the roles of ERF proteins in connection with various signaling
Transcriptional down-regulation by abscisic acid of pathogenesis-related beta-1,3-glucanase genes in tobacco cell cultures.
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Class I isoforms of beta-1,3-glucanases (betaGLU I) and chitinases (CHN I) are antifungal, vacuolar proteins implicated in plant defense. Tobacco (Nicotiana tabacum L.) betaGLU I and CHN I usually exhibit tightly coordinated developmental, hormonal, and pathogenesis-related regulation. Both enzymes
Ca2+-dependent and -independent abscisic acid activation of plasma membrane anion channels in guard cells of Nicotiana tabacum.
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Drought induces stomatal closure, a response that is associated with the activation of plasma membrane anion channels in guard cells, by the phytohormone abscisic acid (ABA). In several species, this response is associated with changes in the cytoplasmic free Ca(2+) concentration. In Vicia faba,
Silencing MPK4 in Nicotiana attenuata enhances photosynthesis and seed production but compromises abscisic acid-induced stomatal closure and guard cell-mediated resistance to Pseudomonas syringae pv tomato DC3000.
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Mitogen-activated protein kinases (MAPKs) play pivotal roles in development and environmental interactions in eukaryotes. Here, we studied the function of a MAPK, NaMPK4, in the wild tobacco species Nicotiana attenuata. The NaMPK4-silenced N. attenuata (irNaMPK4) attained somewhat smaller stature,
Tobacco-mosaic-virus-induced increase in abscisic-acid concentration in tobacco leaves: : Intracellular location in light and dark-green areas, and relationship to symptom development.
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The concentrations of free and bound abscisic acid (ABA and the presumed ABA glucose ester) increased three- to fourfold in leaves of White Burley tobacco (Nicotiana tabacum L.) systemically infected with tobacco mosaic virus. Infected leaves developed a distinct mosaic of light-green and dark-green
Abscisic acid negatively regulates elicitor-induced synthesis of capsidiol in wild tobacco.
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In the Solanaceae, biotic and abiotic elicitors induce de novo synthesis of sesquiterpenoid stress metabolites known as phytoalexins. Because plant hormones play critical roles in the induction of defense-responsive genes, we have explored the effect of abscisic acid (ABA) on the synthesis of
Abscisic-acid metabolism in a wilty mutant of Nicotiana plumbaginifolia.
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A mutant of Nicotiana plumbaginifolia, CKR1, isolated on the basis of its enhanced resistance to cytokinins was found to have a greater tendency to wilt than the wild type (Blonstein et al., 1991, Planta 183, 244-250). Further characterisation has shown that the wiltiness in the mutant is not caused
Abscisic Acid accelerates adaptation of cultured tobacco cells to salt.
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Adaptation of tobacco (Nicotiana tabacum L. var Wisconsin 38) cells to NaCl was accelerated by (+/-) abscisic acid (ABA). In medium with 10 grams per liter NaCl, ABA stimulated the growth of cells not grown in medium with NaCl (unadapted, S-0) with an increasing response from 10(-8) to 10(-4) molar.
Vicilin and Napin Storage-Protein Gene Promoters Are Responsive to Abscisic Acid in Developing Transgenic Tobacco Seed but Lose Sensitivity following Premature Desiccation.
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In transgenic tobacco (Nicotiana tabacum L.) seed, expression of chimeric [beta]-glucuronidase (GUS) genes containing the vicilin or napin storage-protein gene promoters is responsive to premature drying and declines upon rehydration (L. Jiang, W.L. Downing, C.L. Baszczynski, A.R. Kermode [1995]
The nuclear interactor PYL8/RCAR3 of Fagus sylvatica FsPP2C1 is a positive regulator of abscisic acid signaling in seeds and stress.
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The functional protein phosphatase type 2C from beechnut (Fagus sylvatica; FsPP2C1) was a negative regulator of abscisic acid (ABA) signaling in seeds. In this report, to get deeper insight on FsPP2C1 function, we aim to identify PP2C-interacting partners. Two closely related members (PYL8/RCAR3 and
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
Immunoaffinity chromatography of abscisic acid combined with electrospray liquid chromatography-mass spectrometry.
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Polyclonal antibodies with high specificity for C1-immobilised (+)-cis,trans-abscisic acid (ABA) were raised, characterised by enzyme-linked immunosorbent assay (ELISA) and used for preparation of an immunoaffinity chromatography (IAC) gel. The detection limit of the ELISA was approximately
Isolation of abscisic acid-resistant variants from tobacco cell cultures : I. Physiological bases for selection.
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The goal of this work was to begin a genetic study of the molecular mode of action of abscisic acid (ABA), by isolating variant cultured cells resistant to the hormone, or to a factor which induces ABA synthesis, namely water stress. Cell cultures of Nicotiana tabacum L. cv. Wisconsin 38 and N.
Prevention of stomatal closure by immunomodulation of endogenous abscisic acid and its reversion by abscisic acid treatment: physiological behaviour and morphological features of tobacco stomata.
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Transgenic tobacco ( Nicotiana tabacum L.) plants ubiquitously accumulating a single-chain variable-fragment (scFv) antibody against abscisic acid (ABA) to high concentrations in the endoplasmic reticulum (RA plants) show a wilty phenotype. High stomatal conductance and loss of CO(2) and light
Abscisic Acid Stimulated Osmotic Adjustment and Its Involvement in Adaptation of Tobacco Cells to NaCl.
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Osmotic adjustment of cultured tobacco (Nicotiana tabacum L. var Wisconsin 38) cells was stimulated by 10 micromolar (+/-) abscisic acid (ABA) during adaptation to water deficit imposed by various solutes including NaCl, KCl, K(2)SO(4), Na(2)SO(4), sucrose, mannitol, or glucose. The maximum
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