Abstract:
:The typical isohydric plant response to low relative humidity involves stomatal closure, followed by long-term responses like adjustment of shoot-to-root ratios. Little information is available on the early responses of the root system to exposure of shoots to low humidity, nor is it clear to what extent responses of Arabidopsis thaliana conform to the isohydric model. In this study, A. thaliana plants grown hydroponically at high humidity were exposed to two constant relative humidities, 17% and 77%, while the root system remained in aerated nutrient solution. Leaf conductance (g(s)), transpiration, water potential (Psi(l)), osmotic potential, and whole plant hydraulic conductance (K) were determined for the following time intervals: 0-10, 10-20, and 20-40 min, and 0-5, 5-10, and 24-29 h. At low relative humidity, no change in g(s) was detected. Psi(l) decreased by 0.28 MPa during the first 5 h and then remained stable. During the first hour, leaf-specific K averaged 1.6 x 10(-5) kg MPa(-1) m(-2) s(-1) at high humidity. At low humidity it increased >3-fold to 5.8 x 10(-5) kg MPa(-1) m(-2) s(-1). Similar significant differences in K were observed during all time periods. Low concentration mercury amendments in the hydroponic solution (5 microM and 10 microM HgCl(2)) had no discernible influence, but pre-exposure to 50 microM HgCl(2) reduced K differences between humidity treatments. As HgCl(2) is known to be a potent inhibitor of aquaporin function, this suggests that aquaporins may have played a role in the fast hydraulic response of plants transferred to low humidity. The rapid hydraulic response and the influence of mercury raise the possibility that an alternative response to atmospheric dryness is increased K modulated by aquaporins.
journal_name
J Exp Botjournal_title
Journal of experimental botanyauthors
Levin M,Lemcoff JH,Cohen S,Kapulnik Ydoi
10.1093/jxb/erm220subject
Has Abstractpub_date
2007-01-01 00:00:00pages
3711-8issue
13eissn
0022-0957issn
1460-2431pii
erm220journal_volume
58pub_type
杂志文章abstract::RING finger proteins comprise a large family and play important roles in regulation of growth and development, hormone signalling, and responses to biotic and abiotic stresses in plants. In this study, the identification and functional characterization of a C4C4-type RING finger protein gene from the Chinese wild grap...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/err253
更新日期:2011-11-01 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::Because it has a high demand for sulphur (S), oilseed rape is particularly sensitive to S limitation. However, the physiological effects of S limitation remain unclear, especially during the rosette stage. For this reason a study was conducted to determine the effects of mineral S limitation on nitrogen (N) and S upta...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erq096
更新日期:2010-06-01 00:00:00
abstract::Mobile transcription factors play many roles in plant development. Here, we compare the use of mobile transcription factors as signals with some canonical signal transduction processes in prokaryotes and eukaryotes. After an initial survey, we focus on the SHORT-ROOT pathway in Arabidopsis roots to show that, despite ...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/eru548
更新日期:2015-02-01 00:00:00
abstract::Apomixis, a clonal plant reproduction by seeds, is controlled in Paspalum spp. by a single locus which is blocked in terms of recombination. Partial sequence analysis of the apomixis locus revealed structural features of heterochromatin, namely the presence of repetitive elements, gene degeneration, and de-regulation....
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/eru354
更新日期:2014-12-01 00:00:00
abstract::The root cap assists the passage of the root through soil by means of its slimy mucilage secretion and by the sloughing of its outer cells. The root penetration resistance of decapped primary roots of maize (Zea mays L. cv. Mephisto) was compared with that of intact roots in loose (dry bulk density 1.0 g cm-3; penetra...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erg226
更新日期:2003-09-01 00:00:00
abstract::One crucial problem that plants faced during their evolution, particularly during the transition to growth on land, was how to transport water, nutrients, metabolites, and small signaling molecules within a large, multicellular body. As a solution to this problem, land plants developed specific tissues for conducting ...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/erw473
更新日期:2017-01-01 00:00:00
abstract::Protein phosphorylation is key to the regulation of many proteins. Altered protein activity often requires the interaction of the phosphorylated protein with a class of "adapters" known as 14-3-3 proteins. This review will cover aspects of 14-3-3 interaction with key proteins of carbon and nitrogen metabolism such as ...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/erg057
更新日期:2003-01-01 00:00:00
abstract::Zinc (Zn), an essential nutrient in cells, plays a vital role in controlling cellular processes such as growth, development, and differentiation. Although the mechanisms of Zn translocation in rice plants (Oryza sativa) are not fully understood, it has recently received increased interest. OsZIP4 is a Zn transporter t...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erm147
更新日期:2007-01-01 00:00:00
abstract::Edaphic factors such as salinity, sodicity, and drought adversely affect crop productivity, either alone or in combination. Despite soil sodicity being reported as an increasing problem worldwide, limited efforts have been made to address this issue. In the present study, we aimed to generate rice with tolerance to so...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erz462
更新日期:2020-01-07 00:00:00
abstract::Ethylene, or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC), can stimulate hypocotyl elongation in the light. It is questioned whether gibberellins (GAs) play a role in this response. Tests with light of different wavelengths demonstrated that the ethylene response depends on blue light and functional crypt...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erm288
更新日期:2007-01-01 00:00:00
abstract::In recent years, efforts to exploit sunlight, a free and abundant energy source, have sped up dramatically. Oxygenic photosynthetic organisms, such as higher plants, algae, and cyanobacteria, can convert solar energy into chemical energy very efficiently using water as an electron donor. By providing organic building ...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/erz054
更新日期:2019-03-27 00:00:00
abstract::Ethylene is a phytohormone involved in the regulation of several aspects of plant development and in responses to biotic and abiotic stress. The effects of exogenous application of ethylene to sugarcane plants are well characterized as growth inhibition of immature internodes and stimulation of sucrose accumulation. H...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/ery083
更新日期:2018-04-27 00:00:00
abstract::Drought is a major abiotic stress that negatively influences crop yield. Breeding strategies for improved drought resistance require an improved knowledge of plant drought responses. We therefore applied drought to barley recombinant inbred lines and their parental genotypes shortly before tillering. A large-scale pro...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erz075
更新日期:2019-05-09 00:00:00
abstract::Legumes fix atmospheric nitrogen through a symbiotic relationship with bacteroids in root nodules. Following fixation in pea (Pisum sativum L.) nodules, nitrogen is reduced to amino acids that are exported via the nodule xylem to the shoot, and in the phloem to roots in support of growth. However, the mechanisms invol...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/ery289
更新日期:2018-10-12 00:00:00
abstract::The MGOUN3(MGO3)/BRUSHY1(BRU1)/TONSOKU(TSK) gene of Arabidopsis thaliana encodes a nuclear leucine-glycine-asparagine (LGN) domain protein that may be implicated in chromatin dynamics and genome maintenance. Mutants with defects in MGO3 display a fasciated stem and disorganized meristem structures. The transition to f...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erj169
更新日期:2006-01-01 00:00:00
abstract::Drivers behind food security and crop protection issues are discussed in relation to food losses caused by pests. Pests globally consume food estimated to feed an additional one billion people. Key drivers include rapid human population increase, climate change, loss of beneficial on-farm biodiversity, reduction in pe...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/err064
更新日期:2011-06-01 00:00:00
abstract::Cytophotometry of individual nuclei was used to examine the level of endoreduplication in epidermal cells from the upper and lower parts of the ovary during Ornithogalum umbellatum flower and fruit development. An increase in DNA content from 2-4C to 2-8C in both parts of the ovary was observed, while the epidermal ce...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erm071
更新日期:2007-01-01 00:00:00
abstract::Although leaves and other vegetative tissues are generally considered as non-climacteric, citrus leaves show a climacteric system II behaviour after detachment. Upon harvest, young, fully expanded 'Valencia' orange (Citrus sinensis) leaves ( approximately 60-d-old) exhibited two phases of ethylene production. The firs...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/eri137
更新日期:2005-05-01 00:00:00
abstract::A cDNA sequence coding for a pea (Pisum sativum L.) 2-Cys peroxiredoxin (2-Cys Prx) has been cloned. The deduced amino acid sequence showed a high sequence homology to the 2-Cys Prx enzymes of Phaseolus vulgaris (86%), Arabidopsis thaliana (75%), and Spinacia oleracea (75%), and contained a chloroplast target sequence...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erh238
更新日期:2004-10-01 00:00:00
abstract::ERECTA family genes encode leucine-rich repeat receptor-like kinases that control multiple aspects of plant development such as elongation of aboveground organs, leaf initiation, development of flowers, and epidermis differentiation. These receptors have also been implicated in responses to biotic and abiotic stress, ...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/ers305
更新日期:2012-11-01 00:00:00
abstract::ICE1 (Inducer of CBF Expression 1) encodes a MYC-like basic helix-loop-helix transcription factor that acts as a central regulator of cold response. In this study, we elucidated the function and underlying mechanisms of PtrICE1 from trifoliate orange [Poncirus trifoliata (L.) Raf.]. PtrICE1 was upregulated by cold, de...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erv138
更新日期:2015-06-01 00:00:00
abstract::Soluble carbohydrates not only directly affect plant growth and development but also act as signal molecules in processes that enhance tolerance to cold stress. Raffinose family oligosaccharides (RFOs) are an example and play an important role in abiotic stress tolerance. This study aimed to determine whether galactin...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erz450
更新日期:2020-01-01 00:00:00
abstract::Arabinogalactan proteins (AGPs) comprise a family of hydroxyproline-rich glycoproteins that are implicated in plant growth and development. In this study, 69 AGPs are identified from the rice genome, including 13 classical AGPs, 15 arabinogalactan (AG) peptides, three non-classical AGPs, three early nodulin-like AGPs ...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erq104
更新日期:2010-06-01 00:00:00
abstract::Rapid alkalinization factor (RALF) is a peptide signal that plays a basic role in cell biology and most likely regulates cell expansion. In this study, transgenic Arabidopsis thaliana lines with high and low levels of AtRALF1 transcripts were used to investigate this peptide's mechanism of action. Overexpression of th...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/eru099
更新日期:2014-05-01 00:00:00
abstract::Virus-induced gene silencing (VIGS) is a useful tool for functional characterization of genes in plants. Unfortunately, the efficiency of infection by Tobacco rattle virus (TRV) is relatively low for some non-Solanaceae plants, which are economically important, such as rose (Rosa sp.). Here, to generate an easy tracea...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/ert381
更新日期:2014-01-01 00:00:00
abstract::Brassinosteroids (BRs) are essential for many biological processes in plants, however, little is known about their roles in early fruit development. To address this, BR levels were manipulated through the application of exogenous BRs (24-epibrassinolide, EBR) or a BR biosynthesis inhibitor (brassinazole, Brz) and thei...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/ern093
更新日期:2008-01-01 00:00:00
abstract::This paper outlines a numerical scheme for accurate, detailed, and high-throughput image analysis of plant roots. In contrast to existing root image analysis tools that focus on root system-average traits, a novel, fully automated and robust approach for the detailed characterization of root traits, based on a graph o...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erv359
更新日期:2015-11-01 00:00:00
abstract::In contrast to desiccation-tolerant 'orthodox' seeds, so-called 'intermediate' seeds cannot survive complete drying and are short-lived. All species of the genus Coffea produce intermediate seeds, but they show a considerable variability in seed desiccation tolerance (DT), which may help to decipher the molecular basi...
journal_title:Journal of experimental botany
pub_type: 杂志文章
doi:10.1093/jxb/erz508
更新日期:2020-02-19 00:00:00
abstract::Plants require the function of plasma membrane-bound sulphate transporters for the initial uptake of inorganic sulphate. Part of this fundamental process is the energy-dependent proton/sulphate co-transport systems that are located in the surface cell layers of roots. During sulphur limitation, plants are able to acti...
journal_title:Journal of experimental botany
pub_type: 杂志文章,评审
doi:10.1093/jxb/erh175
更新日期:2004-08-01 00:00:00