Abstract:
:Participation of the intervascular transport system within the rice stem during cadmium (Cd) partitioning was investigated by characterizing (109)Cd behaviour in the shoot. In addition, (45)Ca, (32)P, and (35)S partitioning patterns were analysed for comparison with that of (109)Cd. Each tracer was applied to the seedling roots for 15 min, and the shoots were harvested either at 15 min (i.e. immediately after tracer application) or at 48 h. Distribution patterns of each element at 15 min were studied to identify the primary transport pathway before remobilization was initiated. (32)P was preferentially transported to completely expanded leaf blades having the highest transpiration rate. The newest leaf received minimal amounts of (32)P. In contrast, the amount of (35)S transported to the newest leaf was similar to that transported to the other mature leaf blades. Preferential movement towards the newest leaf was evident for (109)Cd and (45)Ca. These results directly indicate that elemental transport is differentially regulated in the vegetative stem as early as 15 min before the elements are transported to leaves. Cd behaviour in the stem was investigated in detail by obtaining serial section images from the bottom part of shoots after (109)Cd was applied to a single crown root. At 30 min, the maximum amount of (109)Cd was distributed in the peripheral cylinder of the longitudinal vascular bundles (PV) and, interestingly, some amount of (109)Cd was transported downwards along the PV. This transport manner of (109)Cd provides evidence that Cd can be loaded on the phloem at the stem immediately after Cd is transported from the root.
journal_name
J Exp Botjournal_title
Journal of experimental botanyauthors
Kobayashi NI,Tanoi K,Hirose A,Nakanishi TMdoi
10.1093/jxb/ers344subject
Has Abstractpub_date
2013-01-01 00:00:00pages
507-17issue
2eissn
0022-0957issn
1460-2431pii
ers344journal_volume
64pub_type
杂志文章abstract::Polarized growth of pollen tubes is a critical step for successful reproduction in angiosperms and is controlled by ROP GTPases. Spatiotemporal activation of ROP (Rho GTPases of plants) necessitates a complex and sophisticated regulatory system, in which guanine nucleotide exchange factors (RopGEFs) are key components...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/ert323
更新日期:2013-12-01 00:00:00
abstract::SPICK2, a homologue of the weakly-inward-rectifying Shaker-like Arabidopsis K channel, AKT2, is a candidate K+-influx channel participating in light- and clock-regulated leaf movements of the legume, Samanea saman. Light and the biological clock regulate the in situ K+-influx channel activity differentially in extenso...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erl104
更新日期:2006-01-01 00:00:00
abstract::The promoter of the Arabidopsis thaliana L. AtEm1 gene encoding a late embryogenesis abundant protein was fused to the beta-glucuronidase reporter gene and introduced into Brassica napus. The promoter is highly active in the vascular tissues of embryo and pollen grains and also active in petals, sepals, caulinar leave...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jexbot/52.360.1587
更新日期:2001-07-01 00:00:00
abstract::The effects of 24-epibrassinolide (EBR) spray application on gas-exchange, chlorophyll fluorescence characteristics, Rubisco activity, and carbohydrate metabolism were investigated in cucumber (Cucumis sativus L. cv. Jinchun No. 3) plants grown in a greenhouse. EBR significantly increased the light-saturated net CO(2)...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erh124
更新日期:2004-05-01 00:00:00
abstract::Accounting for almost one-fifth of the primary production on Earth, the unicellular eukaryotic group of diatoms plays a key ecological and biogeochemical role in our contemporary oceans. Furthermore, as producers of various lipids and pigments, and characterized by their finely ornamented silica cell wall, diatoms hol...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/ert387
更新日期:2014-06-01 00:00:00
abstract::In this study, the uptake of Na+ into the cytosol of rice (Oryza sativa L. cvs Pokkali and BRRI Dhan29) protoplasts was measured using the acetoxy methyl ester of the fluorescent sodium-binding benzofuran isopthalate, SBFI-AM, and fluorescence microscopy. By means of inhibitor analyses the mechanisms for uptake and se...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/eri312
更新日期:2005-12-01 00:00:00
abstract::The molecular mechanisms of abscisic acid (ABA) signalling have been studied for many years; however, how mitochondria-localized proteins play roles in ABA signalling remains unclear. Here an Arabidopsis mitochondria-localized protein RRL (RETARDED ROOT GROWTH-LIKE) was shown to function in ABA signalling. A previous ...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erv356
更新日期:2015-10-01 00:00:00
abstract::Photorespiration is an essential high flux metabolic pathway that is found in all oxygen-producing photosynthetic organisms. It is often viewed as a closed metabolic repair pathway that serves to detoxify 2-phosphoglycolic acid and to recycle carbon to fuel the Calvin-Benson cycle. However, this view is too simplistic...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/erw145
更新日期:2016-05-01 00:00:00
abstract::Examination of root tips from cucumber (Cucumis sativus L.) seedlings grown at 8 degrees C for varying periods ranging from 15 min to 96 h, showed marked changes in the ultrastructure of cortical cells within only 15 min of exposure. Greater parts of the cortex were affected with longer periods of exposure, but the se...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erf071
更新日期:2002-11-01 00:00:00
abstract::Plants have developed diverse defence mechanisms to ward off herbivorous pests. However, agriculture still faces estimated crop yield losses ranging from 25% to 40% annually. These losses arise not only because of direct feeding damage, but also because many pests serve as vectors of plant viruses. Herbivorous thrips ...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/ery060
更新日期:2018-04-09 00:00:00
abstract::Shoot branching is the process by which axillary buds, located on the axil of a leaf, develop and form new flowers or branches. The process by which a dormant bud activates and becomes an actively growing branch is complex and very finely tuned. Bud outgrowth is regulated by the interaction of environmental signals an...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/erm134
更新日期:2008-01-01 00:00:00
abstract::Mosses are among the earliest branching embryophytes and probably originated not later than the early Ordovician when atmospheric CO2 was higher and O2 was lower than today. The C3 biochemistry and physiology of their photosynthesis suggests, by analogy with tracheophytes, that growth of extant bryophytes in high CO2 ...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/erw012
更新日期:2016-03-01 00:00:00
abstract::Narrow-leafed lupin (Lupinus angustifolius L.) is the predominant grain legume crop in southern Australia, contributing half of the total grain legume production of Australia. Its yield in Australia is hampered by a range of subsoil constraints. The adaptation of lupin genotypes to subsoil constraints may be improved ...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erw127
更新日期:2016-06-01 00:00:00
abstract::Pelargonium graveolens is a wild predecessor to rose-scented geranium hybrids prized for their essential oils used as fragrances and flavorings. However, little is known about their biosynthesis. Here we present metabolic evidence that at least two distinct monoterpene biosynthetic pathways contribute to their volatil...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erz397
更新日期:2020-01-01 00:00:00
abstract::It has been suggested that antioxidants play a role in regulating or modulating senescence dynamics of plant tissues. Ethylene has been shown to promote early plant senescence while controlled atmospheres (CA; reduced O2 levels and elevated CO2 levels) can delay its onset and/or severity. In order to examine the possi...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jexbot/51.344.645
更新日期:2000-03-01 00:00:00
abstract::We aim to incorporate deep root traits into future wheat varieties to increase access to stored soil water during grain development, which is twice as valuable for yield as water captured at younger stages. Most root phenotyping efforts have been indirect studies in the laboratory, at young plant stages, or using indi...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/eru250
更新日期:2014-11-01 00:00:00
abstract::Mango is characterized by high tocopherol and carotenoid content during ripening. From a cDNA screen of differentially expressing genes during mango ripening, a full-length p-hydroxyphenylpyruvate dioxygenase (MiHPPD) gene homologue was isolated that encodes a key enzyme in the biosynthesis of tocopherols. The gene en...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/err006
更新日期:2011-06-01 00:00:00
abstract::Sugars regulate the expression of many genes at the transcriptional level. In Arabidopsis thaliana, sugars induce or repress the expression of >1800 genes, including the STP1 (SUGAR TRANSPORTER PROTEIN 1) gene, which encodes an H(+)/monosaccharide cotransporter. STP1 transcript levels decrease more rapidly after the a...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/eru394
更新日期:2015-01-01 00:00:00
abstract::Proline metabolism is important for environmental responses, plant growth, and development. However, its precise roles in plant abiotic stress tolerance are not well understood. Mutants are valuable for the identification of new genes and for elucidating their roles in physiological mechanisms. We applied a suppressor...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erx069
更新日期:2017-03-01 00:00:00
abstract::Regulated cell death plays key roles during essential processes along the plant life cycle. It takes part of specific developmental programs and maintains the organism homeostasis in response to unfavorable environments. Ferroptosis is a recently discovered iron-dependent cell death pathway characterized by the accumu...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/eraa425
更新日期:2020-09-11 00:00:00
abstract::The cyclic nucleotide cGMP has been shown to play important roles in plant development and responses to abiotic and biotic stress. Yet much controversy remains regarding the exact role of this second messenger. Progress in unravelling cGMP function in plants was hampered by laborious and time-consuming methodology to ...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/ers045
更新日期:2012-05-01 00:00:00
abstract::Rates of photosynthesis can be lower in plants grown under conditions of high leaf-to-air vapour pressure difference (VPD) than under low VPD. Leaf phenotype plasticity is a primary factor determining photosynthetic responses to environmental stimuli. However, it remains unclear how changes in leaf anatomical traits d...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erz238
更新日期:2019-09-24 00:00:00
abstract::Photo-oxidative stress was imposed under natural solar radiation on exposed and shaded sections of detached fruit of immature green tomato (Lycopersicon esculentum Miller = Solanum lycopersicum L.) mutants (anthocyanin absent, beta-carotene, Delta, and high pigment-1) and their nearly isogenic parents ('Ailsa Craig' a...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erj136
更新日期:2006-01-01 00:00:00
abstract::Shipping of peaches to distant markets and storage require low temperature; however, cold storage affects fruit quality causing physiological disorders collectively termed 'chilling injury' (CI). In order to ameliorate CI, different strategies have been applied before cold storage; among them heat treatment (HT) has b...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erp267
更新日期:2009-01-01 00:00:00
abstract::Phi thickenings are specialized secondary walls found in root cortical cells. Despite their widespread occurrence throughout the plant kingdom, these specialized thickenings remain poorly understood. First identified by Van Tieghem in 1871, phi thickenings are a lignified and thickened cell wall band that is deposited...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/erz240
更新日期:2019-09-24 00:00:00
abstract::Plants are known to produce NO via the reduction of nitrite. Oxidative NO production in plants has been considered only with respect to a nitric oxide synthase (NOS). Here it is shown that tobacco cell suspensions emitted NO when hydroxylamine (HA) or salicylhydroxamate (SHAM), a frequently used AOX inhibitor, was add...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erp077
更新日期:2009-01-01 00:00:00
abstract::The structure of arabinan and galactan domains in association with cellulose microfibrils was investigated using enzymatic and alkali degradation procedures. Sugar beet and potato cell wall residues (called 'natural' composites), rich in pectic neutral sugar side chains and cellulose, as well as 'artificial' composite...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erm037
更新日期:2007-01-01 00:00:00
abstract::Detyrosination of α-tubulin seems to be conserved in all eukaryotes. However, its biological function in plants has remained obscure. A conserved C-terminal tyrosine is removed by a still unidentified tubulin-tyrosine carboxypeptidase (TTC) and can be religated by a tubulin-tyrosine ligase (TTL). To obtain insight int...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erv012
更新日期:2015-04-01 00:00:00
abstract::Low-temperature stress is an important factor affecting the growth and development of rice (Oryza sativa L.) in temperate and high-elevation areas. Cold stress may cause various seedling injuries, delayed heading and yield reduction due to spikelet sterility. In this study, 181 microsatellite marker loci were used to ...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erg243
更新日期:2003-11-01 00:00:00
abstract::Storage of phosphorus (P) in stem tissue is important in Mediterranean Proteaceae, because proteoid root growth and P uptake is greatest during winter, whereas shoot growth occurs mostly in summer. This has prompted the present investigation of the P distribution amongst roots, stems, and leaves of Hakea prostrata R.B...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erh111
更新日期:2004-05-01 00:00:00