Abstract:
:Distribution of K, Ca, Cl, S, and P in freeze-dried sections of Arabidopsis flower stalk was analyzed by energy dispersive x-ray imaging. Concentrations of these elements in different cell types were quantified by microanalysis of single-cell samples and phloem exudates. Results showed a differential pattern of distribution for all five elements. K concentration was found to be highest in the parenchymatous tissue around vascular bundles. Ca and Cl were present mainly in the central part of the flower stalk. P was largely located in the bundles and in the parenchyma surrounding them. S signal was extraordinary high in groups of cells (S-cells) situated between the phloem of every vascular bundle and the endodermis. Enzymatic hydrolysis by thioglucosidase of cell sap collected from S-cells using a glass microcapillary resulted in the release of glucose, indicating that these cells contain glucosinolates at high (> 100 mM) concentration, which is consistent with the concentration of S (> 200 mM) estimated by x-ray analysis of cell sap samples. Since their position outside of the phloem is ideally suited for protecting the long-distance transport system from feeding insects, the possible roles of these cells as components of a plant defense system are discussed.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Koroleva OA,Davies A,Deeken R,Thorpe MR,Tomos AD,Hedrich Rdoi
10.1104/pp.124.2.599subject
Has Abstractpub_date
2000-10-01 00:00:00pages
599-608issue
2eissn
0032-0889issn
1532-2548journal_volume
124pub_type
杂志文章相关文献
PLANT PHYSIOLOGY文献大全abstract::The kinetics of l-aspartate transport into pea chloroplasts was studied in the presence and absence of transport inhibitors to determine whether multiple aspartate carriers exist. Transport was measured by the silicone oil centrifugation technique. Reciprocal plots of concentration-dependent transport rates were bipha...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.78.2.221
更新日期:1985-06-01 00:00:00
abstract::A fructokinase (EC 2.7.1.4) was obtained from pea (Pisum sativum L.) seeds. This enzyme, termed fructokinase (fraction IV), was specific for fructose as substrate and had little activity with glucose or mannose. Excess fructose inhibited the enzyme at the optimum pH (8.2) but not at pH 6.6. MgATP was inhibitory at pH ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.60.5.666
更新日期:1977-11-01 00:00:00
abstract::We have analyzed the possibility that chemical signaling does not entirely account for the effect of water deficit on the maize (Zea mays L.) leaf elongation rate (LER) under high evaporative demand. We followed time courses of LER (0.2-h interval) and spatial distribution of elongation rate in leaves of either water-...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.114.3.893
更新日期:1997-07-01 00:00:00
abstract::The effects of phosphorus deficiency on carbohydrate accumulation and utilization in 34-day-old soybean (Glycine max L. Merr.) plants were characterized over a diurnal cycle to evaluate the mechanisms by which phosphorus deficiency restricts plant growth. Phosphorus deficiency decreased the net CO(2) exchange rate thr...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.98.1.316
更新日期:1992-01-01 00:00:00
abstract::We have isolated the plasma membrane H+-ATPase in a phosphorylated form from spinach (Spinacia oleracea L.) leaf tissue incubated with fusicoccin, a fungal toxin that induces irreversible binding of 14-3-3 protein to the C terminus of the H+-ATPase, thus activating H+ pumping. We have identified threonine-948, the sec...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.118.2.551
更新日期:1998-10-01 00:00:00
abstract::An important question concerning the role of carboxyarabinitol 1-phosphate (CA1P) metabolism in the light-dependent regulation of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity is the extent to which CA1P is bound to Rubisco in vivo. We report here the development of an extraction procedure using a...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.105.2.731
更新日期:1994-06-01 00:00:00
abstract::Auxins and cytokinins support cell division in tissue and cell cultures. In cytokinin-independent pear (Pyrus communis) cells, omission of 2,4-dichlorophenoxyacetic acid (2,4-D) from the medium for two successive transfers leads to rapid cell lysis, unless the osmolarity is raised to 0.4 molar with mannitol. Use of th...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.64.5.814
更新日期:1979-11-01 00:00:00
abstract::We have identified a wall hydrolytic enzyme from Trichoderma reesei with potent ability to induce extension of heat-inactivated type I cell walls. It is a small (23-kD) endo-1,4-beta-glucanase (Cel12A) belonging to glycoside hydrolase family 12. Extension of heat-inactivated walls from cucumber (Cucumis sativus cv Bur...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.127.1.324
更新日期:2001-09-01 00:00:00
abstract::Our results show that the phosphate ion is a nonlinear competitive inhibitor of Pinus pinea isocitrate lyase. In addition, this compound induces a sigmoidal response of the enzyme, which usually exhibits standard Michaelis-Menten kinetics. This peculiar behavior of P. pinea isocitrate lyase could be explained by a dim...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.124.3.1131
更新日期:2000-11-01 00:00:00
abstract::Adenosine kinase was partially purified from wheat germ. This enzyme preparation, which was devoid of adenine phosphoribosyltransferase and nearly free of adenosine deaminase but contained adenylate kinase, rapidly phosphorylated adenosine and a cytokinin, N(6)-(delta(2)-isopentenyl)adenosine. Electrophoretic analysis...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.59.3.443
更新日期:1977-03-01 00:00:00
abstract::The first compound in the series of reactions leading to the ester conjugates of indole-3-acetic acid (IAA) in kernels of Zea mays sweet corn is the acyl alkyl acetal, 1-O-indol-3-ylacetyl-beta-D-glucose (1-O-IAGlu). The enzyme catalyzing the synthesis of this compound is UDP-glucose:indol-3-ylacetate glucosyl-transf...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.94.1.4
更新日期:1990-01-01 00:00:00
abstract::Opaque or nonvitreous phenotypes relate to the seed architecture of maize (Zea mays) and are linked to loci that control the accumulation and proper deposition of storage proteins, called zeins, into specialized organelles in the endosperm, called protein bodies. However, in the absence of null mutants of each type of...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.110.154690
更新日期:2010-05-01 00:00:00
abstract::Growth response of the seagrass Halophila engelmanni Aschers. was studied using defined culture techniques. When added to the rhizosphere, nutrient-seawater medium supported vigorous plant growth, if substantial Cu (10 times that in modified Hoagland solution) plus organic N were present. H(2)S up to 0.2 millimolar in...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.71.4.975
更新日期:1983-04-01 00:00:00
abstract::The lv-1 mutant of pea (Pisum sativum L.) is deficient in responses regulated by phytochrome B (phyB) in other species but has normal levels of spectrally active phyB. We have characterized three further lv mutants (lv-2, lv-3, and lv-4), which are all elongated under red (R) and white light but are indistinguishable ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.108.2.525
更新日期:1995-06-01 00:00:00
abstract::Mean inhibition of net photosynthesis in autotrophic tobacco callus by 21 and 40% O(2) was 30 and 47%, respectively, similar to intact leaves. Increasing CO(2) concentrations (500-2000 microliters per liter) produced a steady decline in percent inhibition at both O(2) concentrations, indicating that O(2) inhibition re...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.84.4.1055
更新日期:1987-08-01 00:00:00
abstract::Activity of the enzyme ADPglucose pyrophosphorylase is known to be reduced in maize (Zea mays L.) endosperm mutants at two independent loci, Shrunken-2 (Sh(2)) and Brittle-2 (Bt(2)). Spinach leaf ADPglucose pyrophosphorylase has previously been shown to comprise two subunits of 51 and 54 kilodaltons. Anti-bodies raise...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.92.4.881
更新日期:1990-04-01 00:00:00
abstract::Cobalt was shown to be essential for the symbiotic growth of Azolla filiculoides and Anabacna azollac in the absence of fixed nitrogen. Addition of 0.01 mug/liter cobalt resulted in large increases in yield, chlorophyll content and nitrogen fixation as compared to control cultures without cobalt. Cobalt was not requir...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.41.5.852
更新日期:1966-05-01 00:00:00
abstract::Lotus pedunculatus L., Medicago sativa L., Macroptilium atropurpureum, Glycine max, and Trifolium repens L. were grown in a N-free medium and inoculated with one of ten Rhizobium strains. Dry matter, N content, and delta(15)N values were determined for various plant parts.Nodules, with the exception of those from luce...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.72.4.1001
更新日期:1983-08-01 00:00:00
abstract::The study aimed to test the hypothesis that ammonia production by Rhizobium bacteroids provides not only a source of nitrogen for growth but has a central regulatory role in maintaining the metabolic activity and functional integrity of the legume nodule. Production of ammonia in intact, attached nodules was interrupt...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.76.3.705
更新日期:1984-11-01 00:00:00
abstract::An enzyme activity, found for the first time in plants, mainly located in the 22,000g supernatant of the crude extract of sprout apices of Helianthus tuberosus L. cv OB1 tubers, is able in vitro to covalently bind polyamines to endogenous substrates of different molecular weights. The major assay parameters, such as p...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.87.3.757
更新日期:1988-07-01 00:00:00
abstract::Extracts of light-grown Cucumis sativus L. seedlings catalyzed the oxidation of indole-3-acetaldehyde to indole-3-acetic acid. No added cofactors were required. Inhibitor studies indicated that the enzyme is a metalloflavoprotein. While indole-3-aldehyde, benzaldehyde, and phenylacetaldehyde partially inhibited the ox...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.61.1.107
更新日期:1978-01-01 00:00:00
abstract::An ATPase preparation, presumed to be associated with plasma membrane due to the coincidence on isopycnic gradients of cellulase and beta-glucan synthetase at high substrate, has been isolated from the epidermal and mesophyll of tobacco leaf. The ATPase from both tissues was found to prefer ATP over other nucleotides....
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.63.5.936
更新日期:1979-05-01 00:00:00
abstract::A comparative study was made of the effects of auxin (alpha-naphthalene acetic acid), kinetin (6-furfurylaminopurine) and a mixture of auxin and kinetin applied in vivo on synthesis of RNA and protein and the distribution of such synthesis amongst the subcellular fractions of sections of endocarp from Kentucky Wonder ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.42.10.1334
更新日期:1967-10-01 00:00:00
abstract::Measurements of metabolic fluxes in whole embryos and isolated plastids have revealed major changes in the pathways of carbon utilization during cotyledon filling by oilseed rape (Brassica napus L.) embryos. In the early cotyledon stage (stage A), embryos used sucrose (Suc) predominantly for starch synthesis. Plastids...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.122.3.767
更新日期:2000-03-01 00:00:00
abstract::To function, the catalytic sites of Rubisco (EC 4.1.1.39) need to be activated by the reversible carbamylation of a lysine residue within the sites followed by rapid binding of magnesium. The activation of Rubisco in vivo requires the presence of the regulatory protein Rubisco activase. This enzyme is thought to aid t...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.104.056077
更新日期:2005-02-01 00:00:00
abstract::The effect of initial oxygen concentration on the rate and extent of oxidation of the respiratory chain carriers of anaerobic mitochondria from mung bean (Phaseolus aureus) seedlings was examined. The substrate was succinate, with malonate added to give malonate to succinate ratios of 6 to 12, thereby minimizing the f...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.50.1.95
更新日期:1972-07-01 00:00:00
abstract::Interactions between putrescine and membrane function were examined with the use of a recently developed microelectrode system that enables us simultaneously to quantify membrane potentials and net K(+) fluxes associated with individual cells at the root surface of an intact corn (Zea mays L.) seedling. In contrast to...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.90.3.988
更新日期:1989-07-01 00:00:00
abstract::Mg-chelatase catalyzes the first step unique to the chlorophyll branch of tetrapyrrole biosynthesis, namely the insertion of Mg into protoporphyrin IX (Proto). Mg-chelatase was assayed in intact chloroplasts from semi-green cucumber (Cucumis sativus, cv Sumter) cotyledons. In the presence of Proto and MgATP, enzyme ac...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.95.4.1189
更新日期:1991-04-01 00:00:00
abstract::Synechocystis PCC 6803 contains two types of glutathione peroxidase-like proteins (GPX-1 and GPX-2) that utilize NADPH but not reduced glutathione and unsaturated fatty acid hydroperoxides or alkyl hydroperoxides. The steady-state transcript level of gpx-1 gradually increased under oxidative stress conditions imposed ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.104.044842
更新日期:2004-09-01 00:00:00
abstract::We have described the modulation of four auxin-regulated genes during the growth cycle of suspension-cultured tobacco (Nicotiana tabacum [L.] var White Burley) cells. The genes were transiently expressed 2 to 8 h after transfer of stationary phase cells to fresh medium, during the transition from the quiescent phase o...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.102.2.513
更新日期:1993-06-01 00:00:00