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Página 1 desde 55 resultados
Seed development and vivipary in Zea mays L.
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Seed development was investigated in kernels of developing wild-type and viviparous (vp-1) Zea mays L. Embryos and endosperm of wild-type kernels began to dehydrate at approx. 35 d after pollination (DAP); viviparous embryos did not desiccate but accumulated fresh weight via coleoptile growth in the
Mannitol permeation and radial flow of water in maize roots.
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• The postulated nonselective hydraulic route through the root apoplast has not yet been supported by experimental findings on solvent drag. • Therefore, mannitol transport from the medium to the shoot of young maize plants was studied at different rates of transpiration in hydroculture. The
Metabolic profiling to determine the cause of the increased triphenyltetrazolium chloride reduction in mannitol-treated maize callus.
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When Zea mays callus cultures of two different genotypes were treated with the osmoticum mannitol (0.53M) for 24h their ability to reduce the tetrazolium derivative 2,3,5-triphenyltetrazolium chloride (TTC) to form the insoluble red compound formazan is stimulated. The formazan can be extracted with
Protein synthesis in a maize callus exposed to NaCl and mannitol.
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A maize (Zea mays, L) callus was exposed to media containing different levels of NaCl (0 to 3%) and mannitol (0 to 18.2%) for a period of 4 weeks, and the changes in growth and protein synthesis were determined. Cells are able to tolerate and grow in NaCl up to 1% (0.17 M) or mannitol up to 9.1%
Hydraulic Signals from the Roots and Rapid Cell-Wall Hardening in Growing Maize (Zea mays L.) Leaves Are Primary Responses to Polyethylene Glycol-Induced Water Deficits.
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We investigated mechanisms involved in inhibition of maize (Zea mays L.) leaf-elongation growth following addition of non-penetrating osmolyte to the root medium. The elongation rate of the first true leaf remained inhibited for 4 h after addition of polyethylene glycol 6000 (PEG; -0.5 MPa water
Water Relations of Growing Maize Coleoptiles : Comparison between Mannitol and Polyethylene Glycol 6000 as External Osmotica for Adjusting Turgor Pressure.
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Water relations of growing segments of maize (Zea mays L.) coleoptiles were investigated with osmotic methods using either mannitol (MAN) or polyethylene glycol 6000 (PEG) as external osmotica. Segments were incubated in MAN or PEG solutions at 0 to - 15 bar water potential (Psi(o)) and the effects
Inhibition of Acid-Enhanced Elongation of Zea mays Root Segments by Galactose.
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The effect of sugars and metabolic inhibitors on the elongation of Zea mays root segments was analyzed by a rhizometer which records the elongation of each of 32 root segments at the same time. Galactose suppressed the acid-enhanced rapid elongation after a lag period of 1.5 hours, but it did not
Time course study of substrate utilization by Aspergillus flavus in medium simulating corn (Zea mays) kernels.
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Utilization of the three major corn reserve materials, starch, triglycerides (refined corn oil), and zein (storage protein), by Aspergillus flavus was monitored in vitro over a 7-day fermentation. Medium composition in which proportions of reserve materials initially approximated proportions in
Molecular cloning and characterization of six cDNAs expressed during glucose starvation in excised maize (Zea mays L.) root tips.
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In order to isolate glucose-starvation-related cDNAs in maize (Zea mays L.) root tips, a cDNA library was constructed with poly(A)+ mRNA from 24 h starved root tips. After differential screening of the library, we isolated six different cDNAs (named pZSS2 and pZSS7) which were expressed during
Proline is not the primary determinant of chilling tolerance induced by mannitol or abscisic Acid in regenerable maize callus cultures.
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Chilling sensitive regenerable maize (Zea mays L.) callus cultures can be induced to survive prolonged exposure to 4 degrees C by treatments with mannitol, abscisic acid (ABA), and/or high levels of proline. Maize callus with a free proline content of about 122 micromoles/grain fresh weight survived
Assimilate Unloading from Maize (Zea mays L.) Pedicel Tissues : I. Evidence for Regulation of Unloading by Cell Turgor.
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Sugar and (14)C-assimilate release from the pedicel tissue of attached maize (Zea mays L.) kernels was studied following treatment with solute concentrations of up to 800 millimolal. Exposure and collection times ranged from 3 to 6 hours. Sugar and (14)C-assimilate unloading and collection in agar
Alleviative role of exogenously applied mannitol in maize cultivars differing in chromium stress tolerance.
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A pot experiment was performed to examine the role of foliar applied mannitol (M) in chromium (Cr) stress alleviation in different maize cultivars. Two maize cultivars, one tolerant (6103) and one sensitive (9108) to chromium stress, were grown in soil treated with three concentrations of Cr (0, 5,
Over-expression of a Zea mays L. protein phosphatase 2C gene (ZmPP2C) in Arabidopsis thaliana decreases tolerance to salt and drought.
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ZmPP2C (AY621066) is a protein phosphatase type-2c previously isolated from roots of Zea mays (LD9002). In this study, constitutive expression of ZmPP2C in Arabidopsis thaliana under the control of the Cauliflower Mosaic Virus (CaMV) 35S promoter decreased plant tolerance to salt and drought during
Metabolic profiling of two maize (Zea mays L.) inbred lines inoculated with the nitrogen fixing plant-interacting bacteria Herbaspirillum seropedicae and Azospirillum brasilense.
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Maize roots can be colonized by free-living atmospheric nitrogen (N2)-fixing bacteria (diazotrophs). However, the agronomic potential of non-symbiotic N2-fixation in such an economically important species as maize, has still not been fully exploited. A preliminary approach to improve our
Metabolites Identified during Varied Doses of Aspergillus Species in Zea mays Grains, and Their Correlation with Aflatoxin Levels.
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Aflatoxin contamination is associated with the development of aflatoxigenic fungi such as Aspergillus flavus and A. parasiticus on food grains. This study was aimed at investigating metabolites produced during fungal development on maize and their correlation with aflatoxin levels. Maize cobs were
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