Abstract:
:In leaves of S. nigra, fragmentation of the rachis follows the autumnal abscission of leaflets and the high levels of ethylene produced by the senescing blades. Fragmentation is accompanied by cell growth and ultrastructural changes in a zone of cells precisely differentiated at the separation zone. Studies with explants from the rachis show that those that contain an abscission zone increase in freshweight by as much as 50% before and during cell separation. Cell growth changes are induced by ethylene but not by auxin, and are restricted to explants that contain the separation zone cells. In ethylene, enlarging cells of the zone show cytoplasmic activation indicated by dilated dictyosomes, enhanced production of Golgi vesicles, elongated profiles of rough endoplasmic reticulum, a crenellated plasmalemma, and the apparent discharge and accumulation of cytoplasmic vesicles within the desmotubules of the branched plasmodesmata. Degradation of the middle lamella and cell wall matrix could be associated with the release of hydrolytic enzymes on the disruption of the vesicles. Although ultrastructural changes of a similar but limited nature occur in all cells of the rachis in response to ethylene, only those that are morphologically delimited as zone cells exhibit the growth and separation that leads to rachis fragmentation. It is proposed that abscission can occur only at the sites of the positional differentiation of these special ethylene-responsive target cells.
journal_name
Plantajournal_title
Plantaauthors
Osborne DJ,Sargent JAdoi
10.1007/BF00384421subject
Has Abstractpub_date
1976-01-01 00:00:00pages
203-10issue
2eissn
0032-0935issn
1432-2048journal_volume
130pub_type
杂志文章相关文献
PLANTA文献大全abstract::Freezing and thawing lead to xylem embolism when gas bubbles caused by ice formation expand during the thaw process. However, previous experimental studies indicated that conifers are resistant to freezing-induced embolism, unless xylem pressure becomes very negative during the freezing. In this study, we show that co...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-003-0997-4
更新日期:2003-07-01 00:00:00
abstract:MAIN CONCLUSION:The inducible vectors pER8-Gateway-3Flag and pER8-Gateway-3Flag-SRDX have been subjected to considerable research in terms of the function of transcription factors (TFs) via transcription activity and repression, respectively. Approximately 1500 TFs have been identified in Arabidopsis thaliana genome. T...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-018-2873-2
更新日期:2018-05-01 00:00:00
abstract::Transpiration from excised leaves of Anthephra pubescens Nees was enhanced by 1 and 10 mmol m(-3) kinetin. Stomatal opening in isolated epidermal strips of A. pubescens under CO2-free air and in the absence of K(+) was enhanced by 10 mmol m(-3) kinetin. ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388157
更新日期:1977-01-01 00:00:00
abstract::Agrobacterium tumefaciens-induced tumors of dicotyledonous plants consist of well-defined vascular bundle-like structures originating from transformed cells. The current view that 25% of the tumor cells are transformed has been re-investigated by using beta-glucuronidase (gus)-gene-containing wild-type bacteria (A281 ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250050742
更新日期:1999-10-01 00:00:00
abstract::The possible mechanism which leads to inactivation phenomena at high intensities of blue light during the color-sensitive phase in the time course of the Hill reaction was investigated in more detail. The following results were obtained: a) The inhibition of the Hill reaction is also observed during but not prior to t...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386315
更新日期:1972-12-01 00:00:00
abstract::Intact chloroplasts capable of high rates of CO2 assimilation completely oxidized 3-phosphoglycerate and dihydroxyacetone phosphate to glycolate when CO2 concentrations were low. Bicarbonate was converted first into products of the Calvin cycle and then into glycolate. Under high oxygen and at high pH values CO2 fixat...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388894
更新日期:1976-01-01 00:00:00
abstract::In yeast and mammals, ATP-dependent chromatin remodelling complexes of the SWI/SNF family play critical roles in the regulation of transcription, cell proliferation, differentiation and development. Homologues of conserved subunits of SWI/SNF-type complexes, including Snf2-type ATPases and SWI3-type proteins, particip...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-009-0915-5
更新日期:2009-05-01 00:00:00
abstract::Latent nitrate reductase activity (NRA) was detected in corn (Zea mays L., Golden Jubilee) root microsome fractions. Microsome-associated NRA was stimulated up to 20-fold by Triton X-100 (octylphenoxy polyethoxyethanol) whereas soluble NRA was only increased up to 1.2-fold. Microsome-associated NRA represented up to...
journal_title:Planta
pub_type: 杂志文章
doi:
更新日期:1989-01-01 00:00:00
abstract:MAIN CONCLUSION:BcFLC2 functioned as a repressor of flowering by directly regulating BcTEM1, BcMAF2, BcSOC1 and BcSPL15 in Pak-choi. FLOWERING LOCUS C (FLC) plays an important role in regulating flowering time. Here, we functionally described an FLC homologous gene, BcFLC2, that negatively regulated flowering in Pak-ch...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-018-2891-0
更新日期:2018-08-01 00:00:00
abstract:MAIN CONCLUSION:We introduced a novel combination of chromatographic techniques for the purification and analysis of a new UV-sunscreen mycosporine-like amino acid (MAA) in the terrestrial green alga Prasiola calophylla. Prasiola calophylla (Carmichael ex Greville) Kützing (Trebouxiophyceae, Chlorophyta) is a typical m...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-015-2396-z
更新日期:2016-01-01 00:00:00
abstract::Radioactive 2,000 g pellets (2KP) derived from lettuce (Lactuca sativa) hypocotyl sections incubated with [(3)H]gibberellin A1 ([(3)H]GA1) were subjected to a range of treatments to test the stability of labelling. The labelled association was stable in 0.1 M buffer at pH 3 and pH 9 and also in 1 M salt, organic solve...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387809
更新日期:1979-01-01 00:00:00
abstract:MAIN CONCLUSION:A genome-wide analysis of longan miRNA genes was conducted, and full-length pri-miRNA transcripts were cloned. Bioinformatics and expression analyses contributed to the functional characterization of longan miRNA genes. MicroRNAs are important for the post-transcriptional regulation of target genes. How...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-021-03564-w
更新日期:2021-01-21 00:00:00
abstract::The expression pattern of the salT gene was analyzed in different cell types and organs of rice (Oryza sativa L.) in response to saline and hormonal treatments to obtain detailed information on the physiological cues controlling gene expression. Gel blot analysis of RNA and in-situ hybridization performed on seedlings...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250050470
更新日期:1998-12-01 00:00:00
abstract::The jasmonic acid (JA)-dependent regulation of the Thi2.1 gene had previously been exploited for setting up a genetic screen for the isolation of signal transduction mutants of Arabidopsis thaliana (L.) Heynh. that constitutively express the thionin gene. Several cet mutants had been isolated which showed a Constituti...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-002-0907-1
更新日期:2002-11-01 00:00:00
abstract::Phosphorylation/dephosphorylation of the plasma-membrane H(+)-ATPase (EC 3.6.1.35) could act as a regulatory mechanism to control its activity. In this work, a plasmalemma-enriched fraction from maize roots and a partially purified H(+)-ATPase were used to investigate the effects of Ca(2+) and calmodulin on the H(+)-A...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250050621
更新日期:1999-08-12 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::The vegetative prothalli (1-3 weeks old) of Anemia were incubated for 24 h in [(14)C]adenine. The RNA was phenol extracted from whole cells and the poly (A) sequences were isolated by nuclease digestion followed by poly (U)-sepharose chromatography. About 2-3% of the total radioactivity was retained on the column. The...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390085
更新日期:1977-01-01 00:00:00
abstract::When plant storage tissue is cut into thin disks it rapidly develops a high capacity to absorb phosphate from dilute solutions. The recent trend has been to attribute the development of this ability to the increased metabolic activity of bacteria known to be containing the tissue. Data presented in this paper shows th...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387651
更新日期:1970-03-01 00:00:00
abstract:MAIN CONCLUSION:Mitogen-activated protein kinases seem to mark genes which are set up to be activated in daughter cells and thus they may play a direct role in cellular patterning during embryogenesis. Embryonic patterning starts very early and after the first division of zygote different genes are expressed in apical ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-018-2905-y
更新日期:2018-08-01 00:00:00
abstract:MAIN CONCLUSION:The review provides information on the mechanisms underlying the development of spontaneous and pathogen-induced tumors in higher plants. The activation of meristem-specific regulators in plant tumors of various origins suggests the meristem-like nature of abnormal plant hyperplasia. Plant tumor formati...
journal_title:Planta
pub_type: 杂志文章,评审
doi:10.1007/s00425-020-03375-5
更新日期:2020-03-18 00:00:00
abstract::Aspartic proteinase (EC 3.4.23) activity plays a pivotal role in the degradation of Theobroma cacao L. seed proteins during the fermentation step of cacao bean processing. Therefore, this enzyme is believed to be critical for the formation of the peptide and amino acid cocoa flavor precursors that occurs during fermen...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-002-0818-1
更新日期:2002-09-01 00:00:00
abstract::Gametes of opposite mating type (mt (+) and mt (-)) of the green alga Chlamydomonas eugametos agglutinate via their flagella as a prelude to sexual fusion. To quantitate sexual agglutination, an in vitro assay has been developed using (35)S-labeled flagella and the isolated mt (-)agglutination factor. It is shown that...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00411141
更新日期:1984-05-01 00:00:00
abstract::Different epidemiological and preclinical studies have demonstrated that regular consumption of anthocyanin-rich foods is associated to a reduced risk of chronic diseases, such as cardiovascular diseases, cancer and obesity. However, assigning a health property to anthocyanins or other classes of flavonoids may be lim...
journal_title:Planta
pub_type: 杂志文章,评审
doi:10.1007/s00425-014-2131-1
更新日期:2014-11-01 00:00:00
abstract::2-(Chloroethyl)phosphonic acid (CEPA) inhibited the rise in tannin production and phenylalanine ammonia-lyase EC 4.1.1.5 (PAL) activity shown by Acer cells in media containing 9.0×10(-7) M 2,4-D for a period of 2-3 days after its addtion. ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385416
更新日期:1976-01-01 00:00:00
abstract:MAIN CONCLUSION:The physiological phenotype of potato tubers afflicted by zebra chip disease is characterized by increased oxidative stress metabolism and upregulation of systems for its mitigation. Starch catabolism and extensive buildup of reducing sugars render potatoes infected with zebra chip (ZC) pathogen (Candid...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-017-2714-8
更新日期:2017-10-01 00:00:00
abstract::Calli were initiated from carrot (Daucus carota L. subsp. sativus Hoffm.) root expiants and grown on media supplemented with a combination of carbenicillin at 0.3 mg/ml and vancomycin at 0.1 mg/ml in the absence of plant hormones or hormone analogs. The growth rate was about half of that obtained with a combination of...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00202962
更新日期:1991-11-01 00:00:00
abstract::Experiments have been carried out to determine the basis for the dependence of chloroplast pigment synthesis on protein synthesis in dark-grown cells of Euglena gracilis greening in the light. The complete inhibition of chlorophyll synthesis brought about by actidione (10 μg/ml) when added half way through the greenin...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00406651
更新日期:1967-06-01 00:00:00
abstract::Phytochrome was studied spectrophotometrically in Avena sativa L. seedlings that had been grown for 6 d in continous white fluorescent light from lamps. Greening was prevented through the use of the herbicide San 9789. When placed in the light, phytochrome (Ptot) decreased with first order kinetics (τ1/2 ≈ 2 h) but re...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00392003
更新日期:1978-01-01 00:00:00
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::The fluorescent dye Lucifer Yellow CH (LYCH) was introduced directly into the symplast of potato (Solanum tuberosum L.) tuber storage parenchyma by microinjection and also into the apoplast through cuts made in the stolon cortex. Microinjected LYCH moved away rapidly from a single storage cell and spread radially via ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00397661
更新日期:1988-12-01 00:00:00