Osmotic Adjustment
Mostrando 37-48 de 75 artigos, teses e dissertações.
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37. Alteration of Cell-Wall Water Content and Elasticity in Douglas-Fir during Periods of Water Deficit 1
Three populations of seedlings of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) were subjected to recurrent drought cycles. Pressure-volume curves were developed to derive the osmotic and pressure potentials as functions of the symplastic water over a wide range of relative water content. The drought cycles induced large reversible changes in the relati
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38. Osmotic adjustment in the filamentous fungus Aspergillus nidulans.
Aspergillus nidulans was shown to be xerotolerant, with optimal radial growth on basal medium amended with 0.5 M NaCl (osmotic potential [psi s] of medium, -3 MPa), 50% optimal growth on medium amended with 1.6 M NaCl (psi s of medium, -8.7 MPa), and little growth on medium amended with 3.4 M NaCl (psi s of medium, -21 MPa). The intracellular content of solu
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39. Growth, Water Content, and Solute Accumulation of Two Tobacco Cell Lines Cultured on Sodium Chloride, Dextran, and Polyethylene Glycol 1
Simulated drought tolerance was compared for an NaCl-adapted and a nonadapted cell line of tobacco (Nicotiana tabacum var. Samsum) to determine the relationship of salt and drought tolerances. The osmotic adjustment and growth of these two lines was followed when cultured on solid media which contained isosmotic concentrations of NaCl, KCl, polyethylene glyc
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40. Osmotic Stress Tolerance of Transgenic Tobacco Expressing a Gene Encoding a Membrane-Located Receptor-Like Protein from Tobacco Plants1
Tobacco (Nicotiana tabacum) genes regulated during the early stage of responses to wounding were screened by a modified fluorescence differential display method. Among 28 genes initially identified, a particular clone designated NtC7 was subjected to further analysis. Its transcripts were found to accumulate rapidly and transiently within 1 h upon treatments
American Society of Plant Biologists.
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41. Mutants of Arabidopsis thaliana Capable of Germination under Saline Conditions.
Three mutant strains of Arabidopsis thaliana var Columbia were selected for their ability to germinate in elevated concentrations of NaCl. They were not more tolerant than wild type at subsequent development stages. Wild-type strains could not germinate at concentrations > 125 mM NaCl. Two of mutant strains, RS17 and RS20, could withstand up to 225 mM, where
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42. Stress-Induced Osmotic Adjustment in Growing Regions of Barley Leaves 1
Young barley seedlings were stressed using nutrient solutions containing NaCl or polyethylene glycol and measurements were made of leaf growth, water potential, osmotic potential and turgor values of both growing (basal) and nongrowing (blade) tissues. Rapid growth responses similar to those noted for corn (Plant Physiology 48: 631-636) were obtained using e
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43. Diurnal Growth Trends, Water Potential, and Osmotic Adjustment of Maize and Sorghum Leaves in the Field
The daily cycle of leaf elongation rate, water potential, and solute potential of maize and sorghum, as well as temperature, were monitored in the field. Major climatic features were high radiation and a minimum air temperature of about 12 C. Leaf elongation of both crops was slowest at night, presumably because of low temperature. Peak elongation rates were
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44. Expression Patterns of a Novel AtCHX Gene Family Highlight Potential Roles in Osmotic Adjustment and K+ Homeostasis in Pollen Development1[w]
A combined bioinformatic and experimental approach is being used to uncover the functions of a novel family of cation/H+ exchanger (CHX) genes in plants using Arabidopsis as a model. The predicted protein (85–95 kD) of 28 AtCHX genes after revision consists of an amino-terminal domain with 10 to 12 transmembrane spans (approximately 440 residues) and a hyd
American Society of Plant Biologists.
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45. Evidence That Auxin-Induced Growth of Tobacco Leaf Tissues Does Not Involve Cell Wall Acidification1
Interveinal strips (10 × 1.5 mm) excised from growing tobacco (Nicotiana tabacum L. cv Xanthi) leaves have an auxin-specific, epinastic growth response that is developmentally regulated and is not the result of ethylene induction (C.P. Keller, E. Van Volkenburgh [1997] Plant Physiol 113: 603–610). We report here that auxin (10 μm naphthalene acetic
American Society of Plant Physiologists.
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46. Response of Fructan to Water Deficit in Growing Leaves of Tall Fescue.
Changes in dry matter and water-soluble carbohydrate components, especially fructan, were examined in the basal 25 mm of expanding leaf blades of tall fescue (Festuca arundinacea Schreb.) to assess their roles in plant response to water deficit. Water was withheld from vegetative plants grown in soil in controlled-environment chambers. As stress progressed,
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47. Osmoregulation in Cotton in Response to Water Stress 1: II. LEAF CARBOHYDRATE STATUS IN RELATION TO OSMOTIC ADJUSTMENT
Diurnal changes in tissue water potential components, photosynthesis, and specific leaf carbohydrates were examined in water stress-adapted and nonadapted cotton plants. Adapted plants exhibited lower daily minimum leaf water potentials and maintained turgor to lower leaf water potentials than nonadapted plants. Because of this turgor maintenance, photosynth
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48. BetS Is a Major Glycine Betaine/Proline Betaine Transporter Required for Early Osmotic Adjustment in Sinorhizobium meliloti
Hybridization to a PCR product derived from conserved betaine choline carnitine transporter (BCCT) sequences led to the identification of a 3.4-kb Sinorhizobium meliloti DNA segment encoding a protein (BetS) that displays significant sequence identities to the choline transporter BetT of Escherichia coli (34%) and to the glycine betaine transporter OpuD of B
American Society for Microbiology.