Abstract:
:Various sterols and related steroids were tested for their ability to influence ethanol-induced electrolyte leakage from Hordeum vulgare roots. Cholesterol had the greatest influence and, depending on concentration, it stimulated or inhibited the loss of electrolyte. Cholesterol, however, was ineffective if the roots were pretreated with ethanol. These data suggest that sterols protect rather than restore membrane structure. First, modifications in the cholesterol perhydrocyclopentanophenanthrene ring system suggest that at least one double bond is required for membrane activity. Second, increasing the bulkiness of the C(17) side chain of cholesterol, as shown with campesterol, stigmasterol, and sitosterol, decreased its activity. Apparently for maximum effectiveness the sterol molecule should have a relatively flat configuration. Third, the C(3)-hydroxyl group is required for membrane activity since cholesteryl methyl ether, cholest-5-ene-3beta-thiol and cholesteryl halogens were without activity. Exception to the foregoing rule was cholestane which was slightly active but which has neither a C(3)-hydroxyl group nor a double bond in the ring system.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Grunwald Cdoi
10.1104/pp.54.4.624subject
Has Abstractpub_date
1974-10-01 00:00:00pages
624-8issue
4eissn
0032-0889issn
1532-2548journal_volume
54pub_type
杂志文章相关文献
PLANT PHYSIOLOGY文献大全abstract::The elongation rate of cowpea epicotyls from whole cowpea (Vigna sinensis) seedlings and derooted and debladed plants (explants) increased after the main light period (8-hour duration) was extended with either continuous low intensity tungsten light or brief (5 minutes) far-red (FR) irradiation. This end-of-day FR eff...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.85.1.212
更新日期:1987-09-01 00:00:00
abstract::Energy dispersive x-ray analysis was used to study the composition of certain protein body components in Cucurbita maxima cotyledons. The globoid crystal was rich in phosphorus, potassium, and magnesium. This elemental composition provides further evidence that the globoid crystal in squash cotyledon protein bodies is...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.55.5.913
更新日期:1975-05-01 00:00:00
abstract::Electron paramagnetic resonance has been used to quantitate reduction of ferric ion bound to hydroxamate siderophores by iron-stressed fungi (DJ Ecker et al. 1982 J Biol Chem 257:8623-8626) and by iron-stressed Chlorella vulgaris (ATCC 11468) (FCT Allnutt, WD Bonner 1984 J Plant Nutr 7: 427-435). Application of this t...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.83.4.739
更新日期:1987-04-01 00:00:00
abstract::Dark treatment of 25-day-old greenhouse-grown plants of inoculated soybean (Glycine max var. Chippewa) for 1 day reduced ATP by 70%, sucrose by 60%, total adenosine phosphates by 60%, ATP/ADP ratio by 55%, nitrogenase activity by 50%, and energy charge by 15% in nodules. The close correlation between nitrogenase activ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.55.4.796
更新日期:1975-04-01 00:00:00
abstract::Alternative oxidase (AOX) is encoded in small multigene families in plants. Functional analysis of the Arabidopsis (Arabidopsis thaliana) alternative oxidase 1c (AtAOX1c) promoter, an AOX gene not induced by oxidative stress, indicated that regulation of expression was complex, with the upstream promoter region contai...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.106.091819
更新日期:2007-04-01 00:00:00
abstract::A survey of leaf soluble amino acids was conducted for four subtropical seagrasses grown at several salinities. Proline functioned as an organic osmoticum in Halodule wrightii Aschers., Thallasia testudinum Banks ex Koenig, and Ruppia maritima L., while alanine functioned in an osmoregulatory capacity in Halophila eng...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.80.1.283
更新日期:1986-01-01 00:00:00
abstract::The effect of temperature on Hill activity has been compared in chilling-sensitive and chilling-resistant plants. The Arrhenius activation energy (Ea) for the photoreduction of 2,6-dichlorophenolindophenol by chloroplasts isolated from two chilling-sensitive plants, mung bean (Vigna radiata L. var. Mungo) and maize (Z...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.59.6.1141
更新日期:1977-06-01 00:00:00
abstract::Plastid transformation is routine in tobacco (Nicotiana tabacum) but 100-fold less frequent in Arabidopsis (Arabidopsis thaliana), preventing its use in plastid biology. A recent study revealed that null mutations in ACC2, encoding a plastid-targeted acetyl-coenzyme A carboxylase, cause hypersensitivity to spectinomyc...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.17.00857
更新日期:2017-09-01 00:00:00
abstract::Amitrole (3-amino-s-triazole), dichlormate (3,4-dichlorobenzyl methylcarbamate), and pyriclor (2,3,5-trichloro-4-pyridinol) inhibited normal carotenogenesis in etiolated wheat (Triticum aestivum L. var. Coker 65-20) seedlings. Carotenoid precursors accumulated in treated plants. In dichlormate-treated plants, zeta-car...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.1.144
更新日期:1971-01-01 00:00:00
abstract::Flowering of the facultative long-day plant Arabidopsis is controlled by several endogenous and environmental factors, among them gibberellins (GAs) and day length. The promotion of flowering by long days involves an endogenous clock that interacts with light cues provided by the environment. Light, and specifically p...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.007625
更新日期:2002-12-01 00:00:00
abstract::In maize (Zea mays) and other grasses, changes in orientation of stems are perceived by pulvinal tissue, which responds to the stimulus by differential growth resulting in upward bending of the stem. The amyloplast-containing bundle sheath cells are the sites of gravity perception, although the initial steps of gravit...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.127.1.119
更新日期:2001-09-01 00:00:00
abstract::To determine the driving forces for symplastic sugar flux between mesophyll and phloem, gradients of sugar concentrations and osmotic pressure were studied in leaf tissues of two Scrophulariaceae species, Alonsoa meridionalis and Asarina barclaiana. A. meridionalis has a typical symplastic configuration of minor-vein ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.105.068312
更新日期:2006-01-01 00:00:00
abstract::Hydroxyproline-rich glycoproteins (HRGPs) are a superfamily of plant cell wall proteins that function in diverse aspects of plant growth and development. This superfamily consists of three members: hyperglycosylated arabinogalactan proteins (AGPs), moderately glycosylated extensins (EXTs), and lightly glycosylated pro...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.110.156554
更新日期:2010-06-01 00:00:00
abstract::Cells of the red alga Porphyridium cruentum (ATCC 50161) exposed to increasing growth irradiance exhibited up to a three-fold reduction in photosystems I and II (PSI and PSII) and phycobilisomes but little change in the relative numbers of these components. Batch cultures of P. cruentum were grown under four photon fl...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.91.3.1179
更新日期:1989-11-01 00:00:00
abstract::Persistent organic pollutants, such as polychlorinated biphenyls (PCBs), are a global problem. We demonstrate enhanced depletion of PCBs using root-associated microbes, which can use plant secondary metabolites, such as phenylpropanoids. Using a "rhizosphere metabolomics" approach, we show that phenylpropanoids consti...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.102.016295
更新日期:2003-05-01 00:00:00
abstract::A bioassay to measure the incorporation of [(14)C]leucine into acid-precipitable polymers of suspension-cultured sycamore (Acer pseudoplatanus L.) cells is described. Using this assay, cell wall fragments solubilized from sycamore cell walls by partial acid hydrolysis are shown to contain components that inhibit the i...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.72.3.864
更新日期:1983-07-01 00:00:00
abstract::Plant shoot organs arise from initial cells that are recruited from meristematic tissues. Previous studies have shown that members of the WUSCHEL-related HOMEOBOX (WOX) gene family function to organize various initial cell populations during plant development. The function of the WOX4 gene is previously undescribed in...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.109.149641
更新日期:2010-03-01 00:00:00
abstract::Suspension-cultured cells of sycamore (Acer pseudoplatanus L.) which were immersed in liquid nitrogen after prefreezing to the temperatures from -30 to -50 C in the presence of dimethylsulfoxide and glucose as cryoprotective additive could proliferate vigorously when rewarmed rapidly in water at 40 C. For maintaining ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.54.5.722
更新日期:1974-11-01 00:00:00
abstract::Suberin is a complex hydrophobic polymer that acts as a barrier controlling water and solute fluxes and restricting pathogen infections. Suberin is deposited immediately outside of the plasmalemma in the cell wall of certain tissues such as endodermis of roots, aerial and underground periderms, and seed coats. Suberin...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.16.00834
更新日期:2016-07-01 00:00:00
abstract::Phenolic compounds are frequently reported to be the main components of root exudates in response to iron (Fe) deficiency in Strategy I plants, but relatively little is known about their function. Here, we show that removal of secreted phenolics from the root-bathing solution almost completely inhibited the reutilizat...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.107.095794
更新日期:2007-05-01 00:00:00
abstract::Samples of irradiated and control Avena sativa shoot tissue were homogenized together to determine whether, during homogenization phytochrome from irradiated tissue can bind to the particulate material simultaneously extracted from the control tissue. The level of phytochrome pelletability for such mixed tissue homoge...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.66.5.908
更新日期:1980-11-01 00:00:00
abstract::Comparative genomics provides insight into the evolutionary dynamics that shape discrete sequences as well as whole genomes. To advance comparative genomics within the Brassicaceae, we have end sequenced 23,136 medium-sized insert clones from Boechera stricta, a wild relative of Arabidopsis (Arabidopsis thaliana). A s...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.105.073981
更新日期:2006-04-01 00:00:00
abstract::As a step to understanding how the photoreceptor phytochrome acts to change the transcription of specific nuclear genes in Lemna gibba, we wish to compare promoter elements involved in negative regulation by phytochrome with those involved in positive regulation. We have isolated three genes negatively regulated by ph...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.101.3.915
更新日期:1993-03-01 00:00:00
abstract::Purified glycopeptides derived from yeast invertase act as highly potent elicitors in suspension-cultured tomato (Lycopersicon esculentum [L.] Mill) cells, inducing ethylene biosynthesis and phenylalanine ammonia lyase half-maximally at concentrations of 1 to 5 nM. We previously demonstrated the presence of a high-aff...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.112.4.1659
更新日期:1996-12-01 00:00:00
abstract::(31)P NMR spectroscopy was used to study in vivo the symbiotic state established between soybean (Glycine max [L.] Merr. cv Williams) and Bradyrhizobium japonicum (USDA 110 and 138). Different experimental conditions were used to maintain perfused, respiring detached or attached nodules in an NMR magnet. The pH of the...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.89.4.1238
更新日期:1989-04-01 00:00:00
abstract::Plant cytosolic lipid droplets (LDs) are covered with a layer of phospholipids and oleosin and were extensively studied before those in mammals and yeast. Oleosin has short amphipathic N- and C-terminal peptides flanking a conserved 72-residue hydrophobic hairpin, which penetrates and stabilizes the LD Oleosin is synt...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.17.00366
更新日期:2017-08-01 00:00:00
abstract::The resistance to the diffusion of heat and water vapor external to a leaf, can be derived from measurement of the rate of change of the leaf temperature, after a sudden alteration of the intensity of irradiation. The theory of the method has been developed to accommodate the case of a leaf that is freely transpiring,...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.42.5.651
更新日期:1967-05-01 00:00:00
abstract::The effects of high light stress on chloroplast ultrastructure and protein and mRNA composition were investigated in carotenoid-deficient peas (Pisum sativum, L.). In low light, the thylakoid membrane polypeptide pattern was altered, with several prominent chlorophyll-binding proteins present in diminished amounts. Th...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.94.4.1663
更新日期:1990-12-01 00:00:00
abstract::Cells from reproductive soybean (Glycine max [L.] Merr.) plants were isolated using a mechanical-enzymic technique that produced a high yield of uniform, physiologically active cells. Cells were incubated in a pH 6.0 buffered solution and subjected to various treatments in order to determine the nature of net amino ac...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.74.1.26
更新日期:1984-01-01 00:00:00
abstract::Gametophore-over-producing mutants of the moss, Physcomitrella patens, when grown in liquid culture export high levels of cytokinin into their culture medium. The cytokinin produced by these mutants is postulated to account for their peculiar phenotype, that of mosses treated with exogenous cytokinin. N(6)-(Delta(2)-i...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.68.3.735
更新日期:1981-09-01 00:00:00