Abstract：
:Single cell sap sampling and analysis were used to measure the longitudinal and radial distribution of sucrose, glucose and fructose in the apical cell division zone and in the basal, elongated zone of the Ricinus hypocotyl. Sucrose and hexose increased in concentration from the apex to the base of the seedling axis. In the cell division zone low hexose and sucrose concentrations prevailed in cortex and pith, with a slightly higher hexose concentration in pith cells. The sucrose concentrations in sieve tubes and in phloem were much higher than in the cortex and pith cells. In the basal zone of the hypocotyl high levels of sucrose in phloem, cortex and pith were found, therefore radial, diffusional sucrose flow away from the phloem was considered unlikely. It is proposed that radial flow of growth-water to the hypocotyl periphery together with the down-regulation of a sucrose transporter at the phloem leads to a preferential sucrose flow to the expanding cortex. The pith cells, which do not experience flow of growth-water, are probably insufficiently supplied with sucrose from the phloem resulting eventually in cell death as the plant grows. Shortage of sucrose supply, experimentally achieved by removal of the endosperm, led to sucrose hydrolysis in the pith. The sucrose levels in the other tissues decreased less. It appears that the hydrolysis to hexose was initiated to maintain the osmotic value in the pith cell sap. It is speculated that high hexose levels in the cells are indicative of insufficient sucrose supply via the phloem and that the pith cells are confronted with that situation during early seedling development.
journal_name
Plantajournal_title
Plantaauthors
Verscht J,Tomos D,Komor Edoi
10.1007/s00425-006-0309-xsubject
Has Abstractpub_date
2006-11-01 00:00:00pages
1303-14issue
6eissn
0032-0935issn
1432-2048journal_volume
224pub_type
杂志文章相关文献
PLANTA文献大全abstract：MAIN CONCLUSION:Our results showed that methylboronic acid is capable of alleviating boron deficiency, enhancing plant growth, and is less toxic than boric acid at higher concentrations. Boron is an essential plant micronutrient and its deficiency occurs in several regions globally, resulting in impaired plant growth. ...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s00425-018-2903-0
更新日期：2018-07-01 00:00:00
abstract：:Heterocysts of Anabaena cylindrica, isolated rapidly in the cold, were found-in contrast to earlier reports-to contain all of the same lipids and lipophilic pigments, and in about the same proportions, as vegetative cells. In broken filaments and in heterocysts damaged during isolation, the membrane lipids and certain...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00398015
更新日期：1972-03-01 00:00:00
abstract：:The surface of plants is covered by cuticular wax, which contains a mixture of very long-chain fatty acid (VLCFA) derivatives. This wax surface provides a hydrophobic barrier which reduces non-stomatal water loss. One component of the cuticular wax is the alkyl esters, which typically contain a VLCFA esterified to an ...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s00425-007-0489-z
更新日期：2007-07-01 00:00:00
abstract：:Yield is the most important and complex trait for genetic improvement in crops, and marker-assisted selection enhances the improvement efficiency. The USDA rice mini-core collection derived from over 18,000 accessions of global origins is an ideal panel for association mapping. We phenotyped 203 O. sativa accessions f...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s00425-011-1405-0
更新日期：2011-08-01 00:00:00
abstract：:Physical clustering of genes has been shown in plants; however, little is known about gene clusters that have different functions, particularly those expressed in the tomato fruit. A class I 17.6 small heat shock protein (Sl17.6 shsp) gene was cloned and used as a probe to screen a tomato (Solanum lycopersicum) genomi...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s00425-011-1518-5
更新日期：2012-03-01 00:00:00
abstract：:Germination and seedling establishment follows a distinct pattern which is partly controlled by hormones. Roots have high levels of cytokinins. By quantifying the fluctuations in endogenous cytokinins over time, further insight may be gained into the role of cytokinins during germination and seedling establishment. Ra...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s00425-008-0699-z
更新日期：2008-05-01 00:00:00
abstract：:We have investigated the regulation of sucrose storage in cell-suspension cultures of sugarcane. When grown in batch culture, sucrose accumulation commences after about 5 d, when the nitrogen supply is exhausted. Sucrose storage is also induced by decreasing the nitrogen supply to cells growing in a chemostat. The mea...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00197564
更新日期：1991-12-01 00:00:00
abstract：:Conductivity changes in the medium of cultured soybean (Glycine max L.) cells were shown to be strictly correlated with nitrate uptake and growth of the cultures. A continuous record of the conductivity was used as a simple and reliable method of determining specific growth stages and concomitant peaks in the activiti...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00390504
更新日期：1974-03-01 00:00:00
abstract：:Sieve-tube plastids of Aristolochia (5 species investigated) contain several starch grains and always one large crystalloid. In Asarum (3 species investigated) starch has not been found in the sieve-tubes. Their plastids contain several cuneate crystalloids that are sometimes arranged around an invisible centre. Asaru...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00388406
更新日期：1971-03-01 00:00:00
abstract：:Light-induced absorbance changes (LIACs), which are associated with early photochemical events of blue-light transduction, were detected in growing zones of Phycomyces sporangiophores. The novel LIACs meet all the essential requirements for a spectrophotometric photoreceptor assay which was previously unavailable for ...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s004250050559
更新日期：1999-04-01 00:00:00
abstract：MAIN CONCLUSION:Resistant Lactuca spp. genotypes can efficiently modulate levels of S-nitrosothiols as reactive nitrogen species derived from nitric oxide in their defence mechanism against invading biotrophic pathogens including lettuce downy mildew. S-Nitrosylation belongs to principal signalling pathways of nitric o...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s00425-018-2858-1
更新日期：2018-05-01 00:00:00
abstract：:Rust fungi are obligate biotrophic pathogens that differentiate a series of specialized cells to establish infection. One of these cells, the haustorium, which serves to absorb nutrients from living host cells, normally develops only in planta. Here, we show that the rust fungus Uromyces fabae (Pers.) Schroet. stimula...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s00425-006-0320-2
更新日期：2006-11-01 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：:Embryogenesis occurs in cells from brome grass grown in suspension culture in defined medium. Exogenous hormones are not required. The embryos develop into plants which lack chlorophyll. ...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00384708
更新日期：1970-12-01 00:00:00
abstract：:The responses to synthetic d,l abscisin have been studied in a variety of tests. When fed in aqueous solution continuously to leaves of seedlings growing under long day conditions, d,l abscisin caused the cessation of extension growth and the formation of typical resting-buds in Betula pubescens, Acer pseudoplatanus a...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00419842
更新日期：1967-03-01 00:00:00
abstract：:Palatinose (isomaltulose, 6-O-alpha-D-glucopyranosyl-D-fructose) is a structural isomer of sucrose which is produced from sucrose by some bacterial strains as a reserve material during periods of low carbon availability. The ability to synthesise palatinose is not only advantageous for the bacteria but is also of indu...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s004250100629
更新日期：2002-01-01 00:00:00
abstract：:The effects of the local anesthetic dibucaine on coupling between electron transport and ATP synthesis-hydrolysis by the coupling-factor complex (CF0CF1 ATPase) were investigated in thylakoid membranes from Spinacia oleracea L. cv. Monatol. Evidence is presented that inhibition of ATP synthesis was produced by a speci...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00194278
更新日期：1991-03-01 00:00:00
abstract：:Endogenous extractable factors associated with auxin action in plant tissues were investigated, especially their effects on elongation of 1-mm coleoptile segments of maize (Zea mays L.), in the presence of saturating 10 microM indole-3-acetic acid (IAA). The relative growth response, to auxin alone, was much smaller i...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s004250000470
更新日期：2001-05-01 00:00:00
abstract：:Synthesis of anthocyanin pigments in etiolated cabbage seedlings is influenced by ethylene at concentrations higher than 10 ppb, and etiolated seedlings produce sufficient ethylene to influence their anthocyanin synthesis. When escape of endogenous ethylene from this tissue is enhanced by means of hypobaric treatment,...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00387635
更新日期：1973-09-01 00:00:00
abstract：:Fe uptake in dicotyledonous plants is mediated by a root plasma membrane-bound ferric reductase that reduces extracellular Fe(III)-chelates, releasing Fe(2+) ions, which are then absorbed via a metal ion transporter. We previously showed that Fe deficiency induces an increased capacity to absorb Fe and other micronutr...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s00425-003-1156-7
更新日期：2004-03-01 00:00:00
abstract：:The effect of chemical stress on the polypeptide composition of the intercellular fluid of barley (Hordeum vulgare L.) and tomato (Lycopersicon esculentum Mill.) leaves has been studied. In some dicotyledonous plant species, including tomato, exposure to chemical stress leads to the denovo synthesis of intercellular p...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00392527
更新日期：1989-05-01 00:00:00
abstract：:Electrophysiological experiments have indicated that a fraction of the major auxin-binding protein (ABP1) of maize (Zea mays L.) might be a receptor on the outer surface of the plasma membrane. The predominant location of ABP1 is in the lumen of the endoplasmic reticulum (ER), in accord with its C-terminal KDEL retent...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00196668
更新日期：1995-01-01 00:00:00
abstract：:Anaerobic conditions completely block the synthesis of carotenoids in Fusarium aquaeduciuum or Neurospora crassa. Even after sufficient illumination of the mycelia in the presence of air, the subsequent production of carotenoids in the dark is suppressed entirely when the fungi are transferred to an oxygen-free atmosp...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00386832
更新日期：1971-09-01 00:00:00
abstract：:Callus cells of Daucus carota L. have different phenylpropanoid pathways depending on the medium composition. Cells propagated on a medium with gibberellic acid do not accumulate cyanidin but incorporate [(14)C]phenylalanine into chlorogenic acid at a high rate. Cells grown on a medium free of gibberellic acid accumul...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00384906
更新日期：1977-01-01 00:00:00
abstract：:The differential growth causing second positive phototropic curvature in intact, black-capped and decapitated Avena coleoptiles has been measured. In all cases the curvature is brought about by a cessation in growth of the illuminated side. The fact that shading the apex does not significantly alter the initial steps ...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00429452
更新日期：1982-08-01 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：:The cell walls in the new white roots of jack pine (Pinus banksiana Lamb.) were observed to constrict around the shrinking protoplast of osmotically stressed roots, and pressure was maintained via an apparent adjustment of cell-wall size and elasticity. These elastic alterations of the cell wall permitted the root cel...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s004250050575
更新日期：1999-05-01 00:00:00
abstract：:It is usually assumed that aquaporins present in the cellular membranes could be an important route in the control of water flux in plants, but evidence for this hypothesis is scarce. In this paper, we report measurements of the osmotic permeability (P(os) of protoplasts isolated from hypocotyls of wild-type and mutan...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/s004250000379
更新日期：2001-01-01 00:00:00
abstract：:Phenylalanine ammonia-lyase (PAL, EC 4.3.1.5) and cinnamic acid 4-hydroxylase (CA4H, EC 1.14.13.11) undergo concomitant increases in activity after a 2 h lag following disc preparation and illumination. The increases in PAL and CA4H activity can be inhibited by actinomycin-D, cordycepin and cycloheximide. It is demons...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00387167
更新日期：1977-01-01 00:00:00
abstract：:The properties of two enzymes involved in the shikimic acid pathway, dehydroquinate hydro-lyase and shikimate: NADP(+) oxidoreductase were studied in different species of higher plants (pteridophytes, gymnosperms, angiosperms) using chromatography on Sephadex G 100, DEAE cellulose, hydroxylapatite and isoelectric focu...
journal_title：Planta
pub_type： 杂志文章
doi：10.1007/BF00390823
更新日期：1974-03-01 00:00:00
