解剖学和形态学
麻醉学
听力与言语-语言病理学
行为科学
心脏和心血管系统
细胞和组织工程学
临床神经病学
危重症监护医学
牙科,口腔外科和医学
皮肤病学
急诊医学
内分泌学和新陈代谢
肠胃学和肝脏学
老人病学和老年医学
卫生保健科学和服务
血液学
免疫学
传染病
综合和补充性医学
医学伦理学
医学信息学
医学实验室技术
医学,全科和内科
医学,法律
医学,研究和试验
神经系统科学
护理
营养学和饮食学
产科医学和妇科医学
肿瘤学
眼科学
整形外科学
耳鼻喉科学
病理学
儿科学
周围血管疾病
药理学和药剂学
生理学
基本医疗保健
精神病学
公共、环境和职业卫生
放射学,核医学和医学成像
康复学
生殖生物学
呼吸系统
风湿病学
运动科学
外科学
毒理学
热带医学
泌尿学和肾脏学
病毒学
老年医学
健康政策和服务
心理学,临床
abstract::A somatic hybrid cell line, cloned from an individual protoplast-fusion product between Arabidopsis thaliana and Brassica campestris, gave rise to formation of numerous plants differing drastically in morphology. Analysis of these various regenerants, all of which originated from one and the same heterokaryon derived ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385546
更新日期:1981-12-01 00:00:00
abstract::Isolated embryos are more suitable for in vivo study of protein synthesis than non-isolated embryos because, after isolation, the uptake of labeled amino acids is about 1000 times higher. However, isolation also stimulates protein synthesis: Up to 4 h after isolation, the capacity to incorporate labeled amino acids in...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385536
更新日期:1981-12-01 00:00:00
abstract::Growth inhibitors were assayed from extracts of intact (attached) and of excised (cultured) root caps of Zea mays L., cv. Merit, the roots of which show a positive geotropic response only after exposure to light. If caps are intact at the time of illumination, at least two inhibitory substances are produced, an acid i...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00394989
更新日期:1981-12-01 00:00:00
abstract::1. Photosynthesis of leaf slices, mesophyll protoplasts, and intact chloroplasts of spinach was inhibited in hypertonic sorbitol solutions. Sorbitol could be replaced by other nonpenetrating osmotica such as sucrose or glycinebetaine. As a penetrating solute, ethyleneglycol was also inhibitory, but osmolarities requir...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00394979
更新日期:1981-12-01 00:00:00
abstract::Anthocyanin formation in 36h dark grown Sinapis alba L. seedlings and inhibition of hypocotyl elongation in 36h and 54h dark grown and 54h and 7 day light grown seedlings in response to continuous red light could be substituted for by hourly 5 min light pulses where the total fluence over the irradiation period is the...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00383896
更新日期:1981-11-01 00:00:00
abstract::The effect of abscisic acid (ABA) on assimilate transport in barley was investigated in two parallel experiments. First, the effect upon [(14)C]sucrose transport from the flag leaf to the ear of a single ABA application made at different stages of growth of the fruits was investigated; the effect was measured 24 h aft...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380827
更新日期:1981-10-01 00:00:00
abstract::The effects of growth retardants, 4-hydroxy-5-isopropyl-2-methylphenyltrimethylammonium chloride-1-piperidine carboxylate (AMO-1618 or AMO) and 2-chloroethyltrimethylammonium chloride (CCC), applied with and without gibberellic acid (GA3), on β-[(3)H]alanine uptake and leakage from pea (Pisum sativum L.) and betacyani...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380817
更新日期:1981-10-01 00:00:00
abstract::The effect on the phytochrome system of light regimes establishing a range of photoequilibria was studied in two light grown dicotyledonous plants, both of which were treated with the herbicide SAN 9789 to prevent chlorophyll accumulation. In Sinapis alba L. cotyledons the results are comparable with phytochrome behav...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384091
更新日期:1981-10-01 00:00:00
abstract::The total isolation procedure for isolation of auxotrophic and temperature-sensitive mutants was applied to haploid mesophyll protoplasts of Hyoscyamus muticus after treatment with N-methyl-N'-nitro-N-nitrosoguanidine. Twelve variant clones were isolated after screening a total of 29,000 clones. Two are auxotrophic fo...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385321
更新日期:1981-10-01 00:00:00
abstract::Special culture conditions for Euglena gracilis Z and ZR are described. They induce interactions between the chloroplast and mitochondrial metabolisms leading to paramylon synthesis. When grown in continuous light under pure nitrogen and in the presence of lactate as the sole carbon source, sugar synthesis occurs duri...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385311
更新日期:1981-10-01 00:00:00
abstract::The influence of nucleoside triphosphates in relation to divalent cations on RNA synthesis of cells from a suspension culture from parsley was investigated. The data obtained from experiments with isolated nuclei and with an in vitro system with highly purified RNA polymerase I were compared with a chromatin-bound nuc...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385363
更新日期:1981-08-01 00:00:00
abstract::From compartmental analysis of radioisotope elutin measurements, fluxes of Ca(2+) were estimated for cortical cells in root segments of onion, Allium cepa L., relative to complete nutrient solutions containing a range of calcium concentrations ([Ca0]) from 2 μeq l(-1) to 20 meq l(-1), increasing in 10-fold steps for C...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385353
更新日期:1981-08-01 00:00:00
abstract::Conditions which induce a transmembrane electrical potential, positive with respect to the inside of membrane vesicles, result in a substantial (4-12-fold) stimulation of the activity of membrane-associated β-glucan synthetases in a membrane preparation derived from the developing cotton (Gossypium hirsutum L.) fiber....
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388260
更新日期:1981-07-01 00:00:00
abstract::Excised wheat (Triticum aestivum L.) and field pea (Pisum arvense L.) roots, incubated under anaerobic conditions or in the presence of uncouplers of oxidative phosphorylation [2,4-dinitrophenol (DNP), carbonylcyanide-m-chlorophenylhydrazone, pentachlorophenol] accumulated nitrite as a result of an inhibition of nitri...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385149
更新日期:1981-07-01 00:00:00
abstract::Red light (R) and gibberellins (GA) each induce a water potential decrease in the axes of lettuce (Lactuca sativa L.) embryos resulting in germination of intact "seeds" (achenes) or an increase in growth of the axes of isolated embryos. The fruit coat and endosperm are a substantial barrier to the penetration of exoge...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00391184
更新日期:1981-06-01 00:00:00
abstract::The activity of glucan synthetase increased dramatically during encystment of Polysphondylium pallidum cells. The majority of activity was present in purified plasma membranes. Activity, measured as glucose incorporation from UDPG into NaOH-insoluble glucan, increased 30-40 fold in the membranes. Increases in activity...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384986
更新日期:1981-05-01 00:00:00
abstract::Tobacco mesophyll protoplasts cultivated in vitro do not synthesize a measurable quantity of chloroplastic ribosomal RNA, but actively synthesize cytoplasmic ribosomal RNA, polyadenylated RNA, and proteins. These syntheses are essentially independent of the presence of hormones in the culture medium and are thus relat...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384976
更新日期:1981-05-01 00:00:00
abstract::Assimilates entering the developing rice caryopsis traverse a short-distance pathway between the terminal sieve elements of the pericarp vascular bundle and the aleurone layer. The ultrastructure of this pathway has been studied. Sieve elements in the pericarp vascular bundle are smaller than their companion cells.The...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387436
更新日期:1981-05-01 00:00:00
abstract::Indole-3-acetic acid (IAA) promotes an increase in steady-state heat production by corn (Zea mays L.) coleoptile tissue; this increase is associated with an elevation in aerobic respiration rates. A detailed time dependence of the exothermic response to IAA was obtained using flow calorimetry. The latent period and ma...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387426
更新日期:1981-05-01 00:00:00
abstract::The technique of EDTA-enhanced phloem exudation (King and Zeevaart, 1974: Plant Physiol. 53, 96-103) was evaluated with respect to the collection and identification of amino acids exported from senescing wheat leaves. Whilst the characteristics of the exudate collected conform with many of the accepted properties of p...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386538
更新日期:1981-05-01 00:00:00
abstract::Simultaneous measurement of the pressure potential of the phloem of F. americana made on two locations on the trunk over long periods of time showed synchronous oscillations of no fixed period during the day. The simultaneous changes in pressure in two different trees indicated environmental changes were responsible f...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00393282
更新日期:1981-04-01 00:00:00
abstract::For phototropic curvature of a green sunflower seedling, only the hypocotyl has to be illuminated; the tip and cotyledons are not involved in stimulus perception. The etiolated seedling is phototropically insensitive, illumination of only the hypocotyl renders it sensitive. It is concluded that the photoreceptor is lo...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00393292
更新日期:1981-04-01 00:00:00
abstract::Scenedesmus obliquus, strain 633, which synthesizes ketocarotenoids and sporopollenin, also forms pink-red-colored cell walls. Both the cell walls left over after autospore liberation and those from homogenates of disrupted green cells have similar carotenoid pigmentation. Canthaxanthin, astaxanthin, an unidentified k...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00395176
更新日期:1981-03-01 00:00:00
abstract::Relative quantum responsivity curves for inhibition of hypocotyl elongation in Sinapis alba L. seedlings previously grown in white light confirm that a marked "end of day" inhibition response can be induced by a monochromatic light treatment (30 min) at the end of the light period. In dark grown seedlings, however, no...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387814
更新日期:1981-02-01 00:00:00
abstract::Particulate enzymic preparations obtained from homogenates of differentiated xylem cells isolated from sycamore trees, catalyzed the formation of a radioactive xylan in the presence of UDP-D-[U-(14)C]xylose as substrate. The synthesized xylan was not dialyzable through Visking cellophane tubing. Successive extraction ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384237
更新日期:1981-01-01 00:00:00
abstract::Vegetative plants of Sinapis alba L. grown under short days were induced to flower by exposure to one long day or continuous long days. Irrespective of the number of long days, the first flower primordia were initiated by the shoot apical meristem 60 h after the start of the inductive treatment. An indirect histoimmun...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390176
更新日期:1980-12-01 00:00:00
abstract::Extracts prepared from dry pea (Pisum sativum, L; cv oberon) primary axes translate efficiently their endogenous messengers in an in vitro protein synthesizing system. The native long-lived messengers are biologically fully active and direct the synthesis of a whole range of polypeptides with MW ranging up to 130,000....
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384657
更新日期:1980-12-01 00:00:00
abstract::Polysomes in sieve elements of rice (Oryza sativa L.) were studied with the electron microscope. The polysomes were found on the rough endoplasmic reticulum (ER) present in immature sieve elements and also on the cisternae of aggregated ER in the parietal layer of mature, enucleate sieve elements. In the immature siev...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390834
更新日期:1980-11-01 00:00:00
abstract::The pattern of protein synthesis was compared in several organs of maize (Zea mays L.) under aerobic and anaerobic conditions. Protein synthesis was measured by [(35)S]methionine incorporation and analysis by two-dimensional native-SDS (sodium lauryl sulfate) polyacrylamide gel electrophoresis and fluorography. The ae...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385619
更新日期:1980-11-01 00:00:00
abstract::A study has been made of the RNA and protein synthesising systems of wheat embryos isolated from seed lots having high viability but differing in vigour. The rate of RNA and protein synthesis in wheat embryos during the early hours of germination is related to the vigour of the seed lot. The imposition of a stress fac...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385609
更新日期:1980-11-01 00:00:00
abstract::The waxes associated with the suberin in the periderm of the underground storage organs of parsnip (Pastinaca sativa L.), carrot (Daucus carota L.), rutabaga (Brassica napobrassica Mill.), turnip (Brassica rapa L.), red beet (Beta vulgaris L.), sweet potato (Ipomoea batatas L.) and potato (Solanum tuberosum L.) were i...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00552662
更新日期:1980-10-01 00:00:00
abstract::Cutin and suberin polymers from various anatomical regions of grapefruit were analyzed chemically and ultrastructurally. The leaf, fruit peel and juice-sac showed an amorphous cuticular layer. The cutin in the leaf was composed of 10,16-dihydroxy C16 acid and its positional isomers as the major monomers whereas 16-hyd...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385755
更新日期:1980-10-01 00:00:00
abstract::Leaves of plants with Crassulacean acid metabolism (CAM) were analyzed for variation in the content of polyamines in connection with the metabolism of malic acid in the dark and in the light, and with the induction of full-CAM activity. Under conditions (long days) resulting in extremely low CAM activity, young leaves...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385745
更新日期:1980-10-01 00:00:00
abstract::Cells of Daucus carota grown in a liquid medium produced large amounts of cyanidin as the only flavonoid aglycon. After inoculation in fresh medium a maximum activity of phenylalanine ammonia lyase (PAL; EC 4.3.1.5) was observed within 24 h. L-α-aminooxy-β-phenylpropionic acid (L-AOPP), thought to be a competitive inh...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384567
更新日期:1980-08-01 00:00:00
abstract::The apparent photosynthetic affinity of A. variabilis to CO2 is greatly affected by the CO2 concentration in the medium during growth. Halfmaximal rate of photosynthetic O2 evolution is achieved at 10 μM and 100 μM inorganic carbon (Cinorg) in cells grown at low-CO2 (air) and high CO2 (5% v/v CO2 in air), respectively...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384557
更新日期:1980-08-01 00:00:00
abstract::Seedlings of Amaranthus caudatus L. var. Pendula were used to study the influence of several treatment: white light, 3,4-dihydroxyphenylalanine (DOPA), kinetin, gibberellic acid (GA3) on betalains biosynthesis. The pigments, betacyanins and betaxanthins, were separated using a Sephadex G-15 column chromatography. Qual...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380880
更新日期:1980-07-01 00:00:00
abstract::Using somatic hybrid cell lines Arabidopsis thaliana+Brassica campestris, obtained by cloning individual protoplast-fusion products as starting material, shoots and flowering plants have been regenerated. Cytological, biochemical, and morphological analyses indicate that genetic material of both species is present in ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380870
更新日期:1980-07-01 00:00:00
abstract::Cultured tobacco-pith tissue contains a cytoplasmic receptor for indoleacetic acid (IAA). The concentration of binding sites is very low in comparison to that of several auxin receptors found by other investigators. A few obvious possible causes (degradation or inactivation) were investigated. From the results we conc...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386225
更新日期:1980-06-01 00:00:00
abstract::Sucrose is taken up and accumulated by cotyledons of Ricinus communis L. Autoradiographic studies reveal a predominant accumulation of sucrose in the phloem of the cotyledons. The export of sucrose from the cotyledons to hypocotyl and roots proceeds in the phloem by mass flow. These results, taken together with previo...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388125
更新日期:1980-04-01 00:00:00
abstract::Light-induced expansion of Phaseolus vulgaris L. leaf cells is accompanied by increased cell-wall plasticity. The possibility that leaf-cell walls are loosened by excreted protons has been investigated. First, light causes acidification, detected at the leaf surface, within 5-15 min. Growth starts 10-20 min after expo...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380038
更新日期:1980-04-01 00:00:00