Abstract:
:Although active oxygen species are produced at high rates in both the chloroplasts and peroxisomes of the leaves of C3 plants, most attention has focused on the potentially damaging consequences of enhanced chloroplastic production in stress conditions such as drought. This article attempts to provide quantitative estimates of the relative contributions of the chloroplast electron transport chain and the glycolate oxidase reaction to the oxidative load placed on the photosynthetic leaf cell. Rates of photorespiratory H2O2 production were obtained from photosynthetic and photorespiratory flux rates, derived from steady-state leaf gas exchange measurements at varying irradiance and ambient CO2. Assuming a 10% allocation of photosynthetic electron flow to the Mehler reaction, photorespiratory H2O2 production would account for about 70% of total H2O2 formed at all irradiances measured. When chloroplastic CO2 concentration rates are decreased, photorespiration becomes even more predominant in H2O2 generation. At the increased flux through photorespiration observed at lower ambient CO2, the Mehler reaction would have to account for more than 35% of the total photosynthetic electron flow in order to match the rate of peroxisomal H2O2 production. The potential signalling role of H2O2 produced in the peroxisomes is emphasized, and it is demonstrated that photorespiratory H2O2 can perturb the redox states of leaf antioxidant pools. We discuss the interactions between oxidants, antioxidants and redox changes leading to modified gene expression, particularly in relation to drought, and call attention to the potential significance of photorespiratory H2O2 in signalling and acclimation.
journal_name
Ann Botjournal_title
Annals of botanyauthors
Noctor G,Veljovic-Jovanovic S,Driscoll S,Novitskaya L,Foyer CHdoi
10.1093/aob/mcf096keywords:
subject
Has Abstractpub_date
2002-06-01 00:00:00pages
841-50eissn
0305-7364issn
1095-8290journal_volume
89 Spec Nopub_type
杂志文章相关文献
ANNALS OF BOTANY文献大全abstract:BACKGROUND AND AIMS:The leaf anatomy and ultrastructure of Deschampsia antarctica (Poaceae) plants growing in three different habitats (a dry site in the Antarctic tundra, a wet site in a zone exposed to sea spray and a greenhouse) were investigated. The ultrastructure of the leaves of D. antarctica has not been studie...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mci262
更新日期:2005-11-01 00:00:00
abstract:Background and Aims:Bird pollination is rare among species in the genus Utricularia, and has evolved independently in two lineages of this genus. In Western Australia, the Western Spinebill, Acanthorhynchus superciliosus, visits flowers of Utricularia menziesii (section Pleiochasia: subgenus Polypompholyx). This study ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcy163
更新日期:2019-01-01 00:00:00
abstract:BACKGROUND AND AIMS:Sexually deceptive orchids achieve cross-pollination by mimicking the mating signals of female insects, generally hymenopterans. This pollination mechanism is often highly specific as it is based primarily on the mimicry of mating signals, especially the female sex pheromones of the targeted pollina...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcp208
更新日期:2009-11-01 00:00:00
abstract:Background and Aims:During the growing season, the cambium of conifer trees produces successive rows of xylem cells, the tracheids, that sequentially pass through the phases of enlargement and secondary wall thickening before dying and becoming functional. Climate variability can strongly influence the kinetics of morp...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcw274
更新日期:2017-04-01 00:00:00
abstract:BACKGROUND:S-RNase-based self-incompatibility (SI) occurs in the Solanaceae, Rosaceae and Plantaginaceae. In all three families, compatibility is controlled by a polymorphic S-locus encoding at least two genes. S-RNases determine the specificity of pollen rejection in the pistil, and S-locus F-box proteins fulfill this...
journal_title:Annals of botany
pub_type: 杂志文章,评审
doi:10.1093/aob/mcr179
更新日期:2011-09-01 00:00:00
abstract:BACKGROUND AND AIMS:Despite extensive study of polyploidy, its origin, and ecogeographical differences between polyploids and their diploid progenitors, few studies have addressed ploidy-level structure and patterns of ecogeographical differentiation at various spatial scales using detailed sampling procedures. The pat...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcq035
更新日期:2010-05-01 00:00:00
abstract::Characteristics of current-year shoot populations were examined for three mature trees of each of three deciduous broad-leaved species. For first-order branches (branches emerging from the vertical trunk) of the trees examined, lengths or diameters of all current-year shoots were measured. Total leaf mass and total cu...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcg144
更新日期:2003-09-01 00:00:00
abstract:BACKGROUND:Plants are sessile organisms that have the ability to integrate external cues into metabolic and developmental signals. The cues initiate specific signal cascades that can enhance the tolerance of plants to stress, and these mechanisms are crucial to the survival and fitness of plants. The adaption of plants...
journal_title:Annals of botany
pub_type: 杂志文章,评审
doi:10.1093/aob/mcv063
更新日期:2015-09-01 00:00:00
abstract:BACKGROUND AND AIMS:Reproductive assurance through autonomous selfing is thought to be one of the main advantages of self-fertilization in plants. Floral mechanisms that ensure autonomous seed set are therefore more likely to occur in species that grow in habitats where pollination is scarce and/or unpredictable. METH...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcr032
更新日期:2011-05-01 00:00:00
abstract::The various pollen dispersal units (PDU) found in orchids are discussed together with possible evolutionary trends and the consequences for germination and fertilization. Orchids with monad and tetrad pollen form more complex dispersal units by means of pollenkitt, elastoviscin, a callosic wall, common walls or a comb...
journal_title:Annals of botany
pub_type: 杂志文章,评审
doi:10.1093/aob/mcf138
更新日期:2002-06-01 00:00:00
abstract::Experiments were carried out at IGER, Aberystwyth, UK to investigate traits of direct relevance to the processes of overwintering and spring growth in white clover (Trifolium repens L.). The plant material used was derived from baseline populations of the cultivar AberHerald and survivor populations generated after 2-...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcf037
更新日期:2002-03-01 00:00:00
abstract:BACKGROUND AND AIMS:Because of its rapid growth rate, relative ease of transformation, sequenced genome and low gene number relative to Arabidopsis, the tropical fruit tree, Carica papaya, can serve as a complementary genetic model for complex traits. Here, new phenotypes and touch-regulated gene homologues have been i...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcp009
更新日期:2009-04-01 00:00:00
abstract::A procedure is described for obtaining allometric regression equations to estimate non-destructively and in a cost-effective manner the current year's above-ground vegetative and reproductive biomass of Vitis vinifera L. Merlot' throughout the growing season. Significant relationships were obtained over a 3-year perio...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcf059
更新日期:2002-04-01 00:00:00
abstract::Background and Aims Allozyme and reproductive data sets for the Canarian flora are updated in order to assess how the present levels and structuring of genetic variation have been influenced by the abiotic island traits and by phylogenetically determined biotic traits of the corresponding taxa; and in order to suggest...
journal_title:Annals of botany
pub_type: 杂志文章,评审
doi:10.1093/aob/mct076
更新日期:2013-06-01 00:00:00
abstract:BACKGROUND AND AIMS:Although high light (HL) and high temperature (HT) stresses have been extensively investigated, a global analysis of their combined effects on the transcriptome of any plant species has not yet been described. Sunflower is an agronomically important oil crop frequently subjected to these stress fact...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcn071
更新日期:2008-07-01 00:00:00
abstract::Different gravity environments have been shown to significantly affect leaf-plantlet formation and asexual reproduction in Kalanchoë daigremontiana Ham. and Perr. In the present work, we investigated the effect of gravity at tissue and cell levels. Leaves and leaf-plantlets were cultured for different periods of time ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1006/anbo.2000.1260
更新日期:2000-11-01 00:00:00
abstract:BACKGROUND AND AIMS:Although plant distribution patterns are well documented, our understanding of the ecophysiological mechanisms that control the geographical ranges of plant species remains poor. We used a largely ignored method, the performance of the male gametophyte in vitro, to assess whether the thermal range o...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcw041
更新日期:2016-06-01 00:00:00
abstract:BACKGROUND AND SCOPE:Over more than 120 years of scientific study since Schimper's seminal work, the recognized categories of structurally dependent plants have changed several times. Currently, ignoring parasitic mistletoes, it is usual to distinguish four functional groups: (1) true epiphytes; (2) primary hemiepiphyt...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mct085
更新日期:2013-06-01 00:00:00
abstract:BACKGROUND AND AIMS:The evolution of interspecific reproductive barriers is crucial to understanding species evolution. This study examines the contribution of transitions between self-compatibility (SC) and self-incompatibility (SI) and genetic divergence in the evolution of reproductive barriers in Dendrobium, one of...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcv057
更新日期:2015-09-01 00:00:00
abstract:BACKGROUND AND AIMS:Despite their toxicity, reactive oxygen species (ROS) play important roles in plant cell signalling pathways, such as mediating responses to stress or infection and in programmed cell death, at lower levels. Although studies have indicated that hydrogen peroxide (H(2)O(2)) promotes seed germination ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcs240
更新日期:2013-01-01 00:00:00
abstract:BACKGROUND AND AIMS:There are many unresolved issues concerning the biochemistry of fructan biosynthesis. The aim of this paper is to address some of these by means of modelling mathematically the biochemical processes. METHODS:A model has been constructed for the step-by-step synthesis of fructan polymers. This is ru...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mct087
更新日期:2013-06-01 00:00:00
abstract:BACKGROUND AND AIMS:Recent studies of reproductive biology in ancient angiosperm lineages are beginning to shed light on the early evolution of flowering plants, but comparative studies are restricted by fragmented and meagre species representation in these angiosperm clades. In the present study, the progamic phase, f...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcp276
更新日期:2010-02-01 00:00:00
abstract:BACKGROUND AND AIMS:A reliable protocol for flowering and fruiting in cuttings was developed with the aim of (a) studying inflorescence and flower development in grapevine cuttings and field plants, and (b) assisting haploid plant production. METHODS:Inflorescence and flower development was studied in 'Gewurztraminer'...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mci108
更新日期:2005-05-01 00:00:00
abstract:BACKGROUND:Robustness to genetic and environmental perturbation is a salient feature of multicellular organisms. Loss of developmental robustness can lead to severe phenotypic defects and fitness loss. However, perfect robustness, i.e. no variation at all, is evolutionarily unfit as organisms must be able to change phe...
journal_title:Annals of botany
pub_type: 杂志文章,评审
doi:10.1093/aob/mcv151
更新日期:2016-04-01 00:00:00
abstract::Roots of Allium cepa L. grown in aerated water elongate rapidly, but are not graviresponsive. These roots (1) possess extensive columella tissues comprised of cells containing numerous sedimented amyloplasts, (2) lack mucilage on their tips, and (3) are characterized by a weakly polar movement of calcium (Ca) across ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/oxfordjournals.aob.a087216
更新日期:1986-01-01 00:00:00
abstract:BACKGROUND AND AIMS:Sea level rise (SLR) associated with climate change is intensifying permanent submersion and salinity in salt marshes. In this scenario, hybridization between native and invasive species may result in hybrids having greater tolerance of abiotic stress factors than their parents. Thus, understanding ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcz170
更新日期:2020-02-03 00:00:00
abstract:BACKGROUND AND AIMS:Mongolian Scots pine (Pinus sylvestris var. mongolica) is one of the principal species used for windbreak and sand stabilization in arid and semi-arid areas in northern China. A model-assisted analysis of its canopy architectural development and functions is valuable for better understanding its beh...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcq218
更新日期:2011-04-01 00:00:00
abstract:BACKGROUND AND AIMS:GPT2, a glucose 6-phosphate/phosphate translocator, plays an important role in environmental sensing in mature leaves of Arabidopsis thaliana. Its expression has also been detected in arabidopsis seeds and seedlings. In order to examine the role of this protein early in development, germination and ...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mct298
更新日期:2014-03-01 00:00:00
abstract:BACKGROUND AND AIMS:Arbuscular mycorrhizal symbioses are important for nutrient acquisition in >80 % of terrestrial plants. Recently there have been major breakthroughs in understanding the signals that regulate colonization by the fungus, but the roles of the known plant hormones are still emerging. Here our understan...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mct041
更新日期:2013-05-01 00:00:00
abstract:BACKGROUND AND AIMS:Species in plant communities segregate along fine-scale hydrological gradients. Although this phenomenon is not unique to fynbos, this community regenerates after fire and therefore provides an opportunity to study the ecological genesis of hydrological niche segregation. METHODS:Following wildfire...
journal_title:Annals of botany
pub_type: 杂志文章
doi:10.1093/aob/mcs160
更新日期:2012-11-01 00:00:00