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 indicated that only N(6)-(delta(2)-isopentenyl)adenosine-monophosphate was formed from the cytokinin while about 55% AMP, 45% ADP, and a trace of ATP were formed from adenosine. The biosynthesized nucleoside monophosphates were quantitatively hydrolyzed to the corresponding nucleosides by 5'-nucleotidase and the isopentenyl side chain of the phosphorylated cytokinin was not cleaved. The enzyme did not catalyze phosphorylation of inosine.The phosphorylation of the cytokinin and adenosine required ATP and Mg(2+). The pH optimum was from 6.8 to 7.2 for both the cytokinin and adenosine. At pH 7 and 37 C the Km and V(max) for the cytokinin were 31 mum and 8.3 nmoles per mg protein per minute, and the values for adenosine were 8.7 mum and 46 nmoles per mg protein per minute. Crude enzyme preparations from tobacco callus tissue and wheat germ phosphorylated N(6)-(delta(2)-isopentenyl)adenosine. These preparations also phosphorylated N(6)-(delta(2)-isopentenyl)adenine when 5-phosphorylribose-1-pyrophosphate was present.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Chen CM,Eckert RLdoi
10.1104/pp.59.3.443subject
Has Abstractpub_date
1977-03-01 00:00:00pages
443-7issue
3eissn
0032-0889issn
1532-2548journal_volume
59pub_type
杂志文章相关文献
PLANT PHYSIOLOGY文献大全abstract::Arbuscular mycorrhiza (AM) is a widespread symbiotic association between plants and fungal microsymbionts that supports plant development under nutrient-limiting and various stress conditions. In this study, we focused on the overlapping genetic program activated by two commonly studied microsymbionts in addition to i...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.104.056572
更新日期:2005-04-01 00:00:00
abstract::A purification procedure employing normal chromatographic techniques is outlined for isolating phytochrome from etiolated oat (Avena sativa L.) seedlings. Yields in excess of 20% (25 milligrams or more) of phytochrome in crude extract were obtained from 10- to 15-kilograms lots. The purified oat phytochrome had an abs...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.51.5.917
更新日期:1973-05-01 00:00:00
abstract::Distinct organellar forms of the beta-oxidation enzyme enoyl-coenzyme A (CoA) hydratase were partially purified and characterized from 2-day germinated pea (Pisum sativum L.) seedlings. The purification was accomplished by disruption of purified mitochondria or peroxisomes, (NH(4))(2)SO(4) fractionation, and gel perme...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.95.2.564
更新日期:1991-02-01 00:00:00
abstract::Phototropins (phot1 and phot2) are plant blue-light receptors that mediate phototropism, chloroplast movement, stomatal opening, rapid inhibition of growth of etiolated seedlings, and leaf expansion in Arabidopsis (Arabidopsis thaliana). Their N-terminal region contains two light, oxygen, or voltage (LOV) domains, whi...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.106.089839
更新日期:2007-01-01 00:00:00
abstract::The components in plant signal transduction pathways are intertwined and affect each other to coordinate plant growth, development, and defenses to stresses. The role of ubiquitination in connecting these pathways, particularly plant innate immunity and flowering, is largely unknown. Here, we report the dual roles for...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.111.192617
更新日期:2012-05-01 00:00:00
abstract::The accumulation of starch within photosynthetic tissues and within dedicated storage organs has been characterized extensively in many species, and a function in buffering carbon availability or in fueling later growth phases, respectively, has been proposed. However, developmentally regulated starch turnover within ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.16.00916
更新日期:2016-12-01 00:00:00
abstract::Iron (Fe) is an essential mineral nutrient and an important factor for the composition of natural plant communities. Low Fe availability in aerated soils with neutral or alkaline pH has led to the evolution of elaborate mechanisms that extract Fe from the soil solution. In Arabidopsis (Arabidopsis thaliana), Fe is acq...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.18.00178
更新日期:2018-05-01 00:00:00
abstract::Ice formation in stems, as determined by means of an electrophoretic mobility technique, occurs much more rapidly in azalea than in sour cherry. The difference is more marked in the bark than in the wood. Disrupting the structure of the tissues completely eliminates differences in freezing patterns, although gross ana...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.50.5.527
更新日期:1972-11-01 00:00:00
abstract::Biosynthesis of malate dehydrogenase isoenzymes was studied in cotyledons of watermelons (Citrullus vulgaris Schrad., var. Stone Mountain). The glyoxysomal and mitochondrial isoenzymes are synthesized as higher molecular weight precursors which can be immunoprecipitated by mono-specific antibodies from the products of...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.70.2.483
更新日期:1982-08-01 00:00:00
abstract::Apical segments of roots of Zea mays L. cv. Orla and cv. Anjou show a strong georeaction during 7 hours geostimulation. This is abolished by detipping the segments and restored by replacing the tips upon the apical cut surfaces. After exodiffusion of endogenous indoleacetic acid (IAA) the retipped segments showed a si...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.67.5.1047
更新日期:1981-05-01 00:00:00
abstract::The low temperature exotherms (LTE) of 1-year-old twigs of Haralson apple (Malus pumila Mill.), shagbark hickory (Carya ovata [Mill.] K. Koch), green ash (Fraxinus pennsylvanica Marsh), honey locust (Gleditsia triacanthos L.), American chestnut (Castanea dentata [Marsh] Borkh.), and red oak (Quercus rubra L.) were det...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.66.1.40
更新日期:1980-07-01 00:00:00
abstract::The canonical pathway for isoleucine biosynthesis in plants begins with the conversion of threonine to 2-ketobutyrate by threonine deaminase (OMR1). However, demonstration of methionine gamma-lyase (MGL) activity in Arabidopsis (Arabidopsis thaliana) suggested that production of 2-ketobutyrate from methionine can also...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.109.138651
更新日期:2009-09-01 00:00:00
abstract::Bean (Phaseolus vulgaris L.) seeds contain a putative plant defense protein that inhibits insect and mammalian but not plant alpha-amylases. We recently (J Moreno, MJ Chrispeels [1989] Proc Natl Acad Sci USA 86:7885-7889) presented strong circumstantial evidence that this alpha-amylase inhibitor (alphaAI) is encoded b...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.93.2.805
更新日期:1990-06-01 00:00:00
abstract::Glutathione is generally accepted as the principal electron donor for dehydroascorbate (DHA) reduction. Moreover, both glutathione and DHA affect cell cycle progression in plant cells. But other mechanisms for DHA reduction have been proposed. To investigate the connection between DHA and glutathione, we have evaluate...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.103.033548
更新日期:2004-04-01 00:00:00
abstract::Photosynthetic rate, ribulose 1,5-bisphosphate carboxylase activity, specific leaf weight, and leaf concentrations of carbohydrates, proteins, chlorophyll, and inorganic phosphate were determined periodically from midbloom until maturity in leaves of soybean plants (Glycine max L., var. Hodgson) from which reproductiv...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.61.3.394
更新日期:1978-03-01 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::The growth of transgenic tomato (Lycopersicon esculentum) plants that express in their apoplast yeast invertase under the control of the cauliflower mosaic virus 35S promoter is severely inhibited. The higher the level of invertase, the greater the inhibition of growth. A second phenotypic characteristic of these tran...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.95.2.420
更新日期:1991-02-01 00:00:00
abstract::Zinc is an essential mineral for a wide variety of physiological and biochemical processes. To understand zinc transport in cereals, we identified putative zinc transporters in gene databases. Three full-length cDNAs were identified and characterized from rice (Oryza sativa). Two of the cDNAs partially complemented a ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.103.026815
更新日期:2003-09-01 00:00:00
abstract::The first committed step in the conversion of cycloartenol into Delta(5) C24-alkyl sterols in plants is catalyzed by an S-adenosyl-methionine-dependent sterol-C24-methyltransferase type 1 (SMT1). We report the consequences of overexpressing SMT1 in tobacco (Nicotiana tabacum), under control of either the constitutive ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.004226
更新日期:2002-09-01 00:00:00
abstract::We present four examples of attenuation of the transformed phenotype caused by the root-inducing, left-hand, transferred DNA from Agrobacterium rhizogenes in tobacco (Nicotiana tabacum). The first was associated with a genetic variable (homozygosity for the T-DNA), and the second was induced at the physiological level...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.111.1.259
更新日期:1996-05-01 00:00:00
abstract::Sucrose phosphate synthase and acid invertase activities in the mature leaves of roses (Rosa hybrida cv Golden Times) were greater in plants grown under a higher night temperature than under a lower temperature regime. In young shoots, the activity of acid invertase was promoted by the lower temperature while that of ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.84.2.447
更新日期:1987-06-01 00:00:00
abstract::The Arabidopsis type II peroxiredoxin (PRXII) family is composed of six different genes, five of which are expressed. On the basis of the nucleotide and protein sequences, we were able to define three subgroups among the PRXII family. The first subgroup is composed of AtPRXII-B, -C, and -D, which are highly similar an...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.103.022533
更新日期:2003-08-01 00:00:00
abstract::Transcription of the Arabidopsis thaliana gene encoding ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activase (RCA) is organ-specific, light-responsive, and regulated by the circadian clock. RCA is transcribed throughout the green parts of the plant, but not in roots and petals. Responses elicited by shor...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.112.1.43
更新日期:1996-09-01 00:00:00
abstract::Exposure of dark grown resting Euglena to ethanol produced a transient increase in the specific activity of the glyoxysomal enzyme malate synthase. Enzyme specific activity increased during the first 24 hours of ethanol treatment and then declined. Light exposure or malate addition failed to increase enzyme specific a...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.68.2.430
更新日期:1981-08-01 00:00:00
abstract::The effect of applied nitrogen (N) on the growth, leaf expansion rate, biomass partitioning and leaf N levels of Chenopodium album (C(3)) and Amaranthus retroflexus (C(4)) were investigated. At a given applied N level, C. album had 50% greater leaf N per unit area (N(a)) than A. retroflexus. Nitrate accumulated at low...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.84.3.954
更新日期:1987-07-01 00:00:00
abstract::Indoleacetic acid-induced ethylene production and growth in excised segments of etiolated pea shoots (Pisum sativum L. var. Alaska) parallels the free indoleacetic acid level in the tissue which in turn depends upon the rate of indoleacetic acid conjugation and decarboxylation. Both ethylene synthesis and growth requi...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.4.504
更新日期:1971-04-01 00:00:00
abstract::Differential thermal analysis detected two freezing events when dormant forsythia (Forsythia viridissima Lindl.) flower buds were cooled. The first occurred just below 0 degrees C, and was coincident with the freezing of adjacent woody tissues. The second exotherm appeared as a spike between -10 and -25 degrees C and ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.92.3.718
更新日期:1990-03-01 00:00:00
abstract::Cold acclimation and freezing tolerance are the result of complex interaction between low temperature, light, and photosystem II (PSII) excitation pressure. Previous results have shown that expression of the Wcs19 gene is correlated with PSII excitation pressure measured in vivo as the relative reduction state of PSII...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.001925
更新日期:2002-07-01 00:00:00
abstract::Identification of mechanisms that decrease cadmium accumulation in plants is a prerequisite for minimizing dietary uptake of cadmium from contaminated crops. Here, we show that cadmium inhibits nitrate transporter 1.1 (NRT1.1)-mediated nitrate (NO3 (-)) uptake in Arabidopsis (Arabidopsis thaliana) and impairs NO3 (-) ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.114.243766
更新日期:2014-10-01 00:00:00
abstract::A mutation in the ALTERED XYLOGLUCAN9 (AXY9) gene was found to be causative for the decreased xyloglucan acetylation phenotype of the axy9.1 mutant, which was identified in a forward genetic screen for Arabidopsis (Arabidopsis thaliana) mutants. The axy9.1 mutant also exhibits decreased O-acetylation of xylan, implyin...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.114.256479
更新日期:2015-04-01 00:00:00