Abstract:
:The leaf is considered the most important vegetative organ of tank epiphytic bromeliads due to its ability to absorb and assimilate nutrients. However, little is known about the physiological characteristics of nutrient uptake and assimilation. In order to better understand the mechanisms utilized by some tank epiphytic bromeliads to optimize the nitrogen acquisition and assimilation, a study was proposed to verify the existence of a differential capacity to assimilate nitrogen in different leaf portions. The experiments were conducted using young plants of Vriesea gigantea. A nutrient solution containing NO₃⁻/NH₄⁺ or urea as the sole nitrogen source was supplied to the tank of these plants and the activities of urease, nitrate reductase (NR), glutamine synthetase (GS) and glutamate dehydrogenase (NADH-GDH) were quantified in apical and basal leaf portions after 1, 3, 6, 9, 12, 24 and 48 h. The endogenous ammonium and urea contents were also analyzed. Independent of the nitrogen sources utilized, NR and urease activities were higher in the basal portions of leaves in all the period analyzed. On the contrary, GS and GDH activities were higher in apical part. It was also observed that the endogenous ammonium and urea had the highest contents detected in the basal region. These results suggest that the basal portion was preferentially involved in nitrate reduction and urea hydrolysis, while the apical region could be the main area responsible for ammonium assimilation through the action of GS and GDH activities. Moreover, it was possible to infer that ammonium may be transported from the base, to the apex of the leaves. In conclusion, it was suggested that a spatial and functional division in nitrogen absorption and NH₄⁺ assimilation between basal and apical leaf areas exists, ensuring that the majority of nitrogen available inside the tank is quickly used by bromeliad's leaves.
journal_name
J Plant Physioljournal_title
Journal of plant physiologyauthors
Takahashi CA,Mercier Hdoi
10.1016/j.jplph.2011.01.008subject
Has Abstractpub_date
2011-07-15 00:00:00pages
1208-16issue
11eissn
0176-1617issn
1618-1328pii
S0176-1617(11)00059-9journal_volume
168pub_type
杂志文章abstract::The effect of subculture interval and total culture age on plant regeneration from serially subcultured, leaf derived embryogenic callus cultures of Pennisetum purpureum (Napier grass) was determined. During 38 weeks of culture both embryogenic callus proliferation and the yield of plants was maximal for callus from f...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/S0176-1617(84)80028-0
更新日期:1984-12-01 00:00:00
abstract::To support the key role of glutathione (GSH) in the mechanisms of tolerance and accumulation of arsenic in plants, this work examines the impact of several effectors of GSH synthesis or action in the response of maize (Zea mays L.) to arsenic. Maize was exposed in hydroponics to iso-toxic rates of 150 μM arsenate or 7...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2012.01.016
更新日期:2012-05-01 00:00:00
abstract::Raffinose synthase (RS, EC2.4.1.82) is one of the key enzymes that channels sucrose into the raffinose family oligosaccharides (RFOs) biosynthetic pathway. However, the gene encoding RS is poorly characterized in cucumber (Cucumis sativus L.), which is a typical RFOs-translocating plant species. Here we isolated the g...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2012.07.019
更新日期:2012-12-15 00:00:00
abstract::The goal of the present research was to obtain new insights into the mechanisms underlying drought stress resistance in plants. Specifically, we evaluated changes in the expression of genes encoding enzymes involved in isoprenoid biosynthesis, together with the levels of the corresponding metabolites (chlorophylls, ca...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2008.02.011
更新日期:2009-01-30 00:00:00
abstract::Aquaporins mediate the movement of water across cell membranes. Plasma membrane intrinsic protein 2;5 from Populus trichocarpa×deltoides (PtdPIP2;5) was previously demonstrated to be a functionally important water conducting aquaporin. To study the relevance of aquaporin-mediated root water transport at low temperatur...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2016.02.001
更新日期:2016-03-15 00:00:00
abstract::Most of our knowledge on the regulation of photosynthesis originates from studies performed in highly controlled laboratory conditions. However, in their natural habitats plants are simultaneously subjected to a broad range of abiotic and biotic stimuli which influence photosynthetic efficiency; hence there is an emer...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2012.11.016
更新日期:2013-04-15 00:00:00
abstract::Saliva miltiorrhiza ethylene response factor (SmERF), predicted to be expressed genome-wide, is the potential regulator of tanshinone biosynthesis. However, few studies have investigated its transcriptional regulation pathways in tanshinone biosynthesis. Here, we report an ethylene response factor (SmERF8), which was ...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2019.153006
更新日期:2020-01-01 00:00:00
abstract::Hyacinth (Hyacinthus orientalis) bulbs infected by Fusarium oxysporum showed the symptoms of gummosis. The purpose of this study was to clarify the hormonal regulation of gummosis and composition of gums from hyacinth bulbs. The application of ethephon (2-chloroethylphosphonic acid), an ethylene-releasing compound, at...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2014.10.007
更新日期:2015-02-01 00:00:00
abstract::Hormones are included in the essential elements that control the induction of flowering. Ethylene is thought to be a strong inhibitor of flowering in short day plants (SDPs), whereas the involvement of abscisic acid (ABA) in the regulation of flowering of plants is not well understood. The dual role of ABA in the phot...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2008.04.009
更新日期:2008-12-01 00:00:00
abstract::Stomata formed at high relative air humidity (RH) close less as leaf dries; an effect that varies depending on the genotype. We here quantified the contribution of each stomatal response characteristic to the higher water loss of high RH-grown plants, and assessed the relationship between response characteristics and ...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2013.04.007
更新日期:2013-10-15 00:00:00
abstract::The flavor and taste of fruits are often determined by terpenes. We identified three cDNAs encoding putative terpene synthases from olive fruits of cv. Frantoio and Grignano. Heterologous expression in a bacterial system demonstrated that one of the terpene synthases, OeGES1, was an active monoterpene synthase that co...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2012.01.021
更新日期:2012-06-15 00:00:00
abstract::The changes in length on the two opposite sides of etiolated radish (Raphanus sativus) hypocotyls prior to, and following gravitropic stimulation, were measured using an infrared-imaging system. It was observed that the growth suppression on the upper side began first at least 10 min after the onset of gravitropic sti...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2005.09.006
更新日期:2006-12-01 00:00:00
abstract::Needle differentiation is a very complex process associated with the formation of a mature photosynthetic organ. From meristem differentiation to leaf maturation, gene control must play an important role switching required genes on and off to define tissue functions, with the epigenetic code being one of the main regu...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2009.09.018
更新日期:2010-03-15 00:00:00
abstract::Grazing is accompanied by a multitude of processes including wounding, saliva deposition, and defoliation. Previous studies have focused on the effects of the grazing or clipping intensity on plant regrowth, survival, and composition in the grassland. However, the impact of saliva deposition on plants is poorly unders...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2010.08.012
更新日期:2011-03-15 00:00:00
abstract::Plants developed receptors for solar UV-A/B radiation, which regulate a complex network of functions through the plant's life cycle. However, greenhouse grown crops, like tomato, are exposed to strongly reduced UV radiation, contrarily to their open-field counterparts. A new paradigm of modern horticulture is to suppl...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2017.11.013
更新日期:2018-02-01 00:00:00
abstract::Previous studies have shown that plants developed under high relative air humidity (RH>85%) develop malfunctioning stomata and therefor have increased transpiration and reduced desiccation tolerance when transferred to lower RH conditions and darkness. In this study, plants developed at high RH were exposed to daily V...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2016.12.011
更新日期:2017-04-01 00:00:00
abstract::Using a direct somatic embryogenesis system in carrot, we examined the role of DNA methylation in the change of cellular differentiation state, from somatic to embryogenic. 5-Azacytidine (aza-C), an inhibitor of DNA methylation suppressed the formation of embryogenic cell clumps from epidermal carrot cells. Aza-C also...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2004.05.013
更新日期:2005-01-01 00:00:00
abstract::After several years of close contacts and extensive discussion between various plant physiologists of different European countries, the Federation of European Societies of Plant Physiology (FESPP) was established in 1978 in Edinburgh. The aim of the FESPP was and remains to promote up-to-date plant physiology research...
journal_title:Journal of plant physiology
pub_type: 历史文章,杂志文章
doi:10.1078/0176-1617-01371
更新日期:2004-06-01 00:00:00
abstract::The effects of placing solid implants containing Fe sulfate in branches of Fe-deficient pear and peach trees on the composition of the xylem sap have been studied. Iron sulfate implants are commercially used in northeastern Spain to control iron chlorosis in fruit trees. Implants increased Fe concentrations and decrea...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1078/0176-1617-01010
更新日期:2003-12-01 00:00:00
abstract::We present here the comparative protective potentiality of exogenously applied polyamines (PAs), namely spermidine (Spd) and spermine (Spm), in mitigating NaCl toxicity and inducing short-term salinity tolerance in three indica rice varieties, namely M-1-48 (salt-sensitive), Nonabokra (salt-tolerant) and Gobindobhog (...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2010.07.009
更新日期:2011-03-01 00:00:00
abstract::Linoleic acid (LA, C18:2) and α-linolenic acid (ALA, C18:3) are polyunsaturated fatty acids (PUFAs) and major storage compounds in plant seed oils. Microsomal ω-6 and ω-3 fatty acid (FA) desaturases catalyze the synthesis of seed oil LA and ALA, respectively. Jatropha curcas L. seed oils contain large proportions of L...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2013.04.019
更新日期:2013-10-15 00:00:00
abstract::In bright sunlight photosynthetic activity is limited by the enzymatic machinery of carbon dioxide assimilation. This supererogation of energy can be easily visualized by the significant increases of photosynthetic activity under high CO(2) conditions or other metabolic strategies which can increase the carbon flux fr...
journal_title:Journal of plant physiology
pub_type: 杂志文章,评审
doi:10.1016/j.jplph.2010.07.012
更新日期:2011-01-15 00:00:00
abstract::Salicylic acid (SA), 2-hydroxy benzoic acid, is a small phenolic compound with multifunction that is involved in plant growth, development, and the acquisition of stress tolerance. In recent years, hydrogen sulfide (H2S) has been found to have similar functions, but cross talk between SA and H2S in the acquisition of ...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2014.12.018
更新日期:2015-04-01 00:00:00
abstract::The identification of critical components in plant salt stress adaptation has greatly benefitted, in the last two decades, from fundamental discoveries in Arabidopsis and close model systems. Nevertheless, this approach has also highlighted a non-complete overlap between stress tolerance mechanisms in Arabidopsis and ...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2012.07.004
更新日期:2012-12-15 00:00:00
abstract::The molybdenum cofactor (Moco) is ubiquitously present in all kingdoms of life and vitally important for survival. Among animals, loss of the Moco-containing enzyme (Mo-enzyme) sulphite oxidase is lethal, while for plants the loss of nitrate reductase prohibits nitrogen assimilation. Moco is highly oxygen-sensitive, w...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2016.10.002
更新日期:2016-12-01 00:00:00
abstract::Smut infection alters the transcription of dirigent proteins (DIR) by sugarcane plants. Here, we show that these alterations are associated to an elevated production of cytotoxic lignans. Smut-resistant sugarcane varieties display a fivefold increase in pinoresinol and also produce elevated amounts of secoisolaricires...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2019.153087
更新日期:2020-01-01 00:00:00
abstract::Nod factors (Lipo-chitooligosaccharides, or LCOs) act as bacteria-to-plant signal molecules that modulate early events of the Bradyrhizobium-soybean symbiosis. It is known that low root zone temperature inhibits the early stages of this symbiosis; however, the effect of low soil temperature on bacteria-to-plant signal...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2005.04.029
更新日期:2006-01-01 00:00:00
abstract::Purine and pyrimidine nucleotides participate in many biochemical processes in plants. They are building blocks for nucleic acid synthesis, an energy source, precursors for the synthesis of primary products, such as sucrose, polysaccharides, phospholipids, as well as secondary products. Therefore, biosynthesis and met...
journal_title:Journal of plant physiology
pub_type: 杂志文章,评审
doi:10.1078/0176-1617-01169
更新日期:2003-11-01 00:00:00
abstract::Gibberellin 20-oxidases, enzymes of gibberellin (GA) biosynthesis, play an important role in (GA) homeostasis. To investigate the regulation of tomato SlGA20ox1 expression, a genomic clone was isolated, its promoter transcriptionally fused to the GUS reporter gene, and the construct used to transform Arabidopsis. Expr...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2010.03.019
更新日期:2010-09-15 00:00:00
abstract::Nodule conductance to O2 diffusion has been involved as a major factor of the inhibition of N2 fixation by soil salinity that severely reduces the production of grain legumes. In order to determine the effect of this constraint on the nodule conductance, oxygen uptake by the nodulated roots of Cicer arietinum was meas...
journal_title:Journal of plant physiology
pub_type: 杂志文章
doi:10.1016/j.jplph.2006.05.016
更新日期:2007-08-01 00:00:00