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You searched for: Journal name Plant physiology Remove constraint Journal name: Plant physiology Subject Helianthus annuus Remove constraint Subject: Helianthus annuus
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1. Stomatal Responses to Flooding of the Intercellular Air Spaces Suggest a Vapor-Phase Signal Between the Mesophyll and the Guard Cells

Author:
Sibbernsen, Erik; Mott, Keith A.
Source:
Plant physiology 2010 v.153 no.3 pp. 1435-1442
ISSN:
0032-0889
Subject:
guard cells; stomata; intercellular spaces; stomatal movement; Helianthus annuus; Tradescantia; silicone; floods; xylem; oils; potassium chloride; hydrophobicity; Lactuca serriola; mesophyll; Oenothera; filters
Abstract:
... Flooding the intercellular air spaces of leaves with water was shown to cause rapid closure of stomata in Tradescantia pallida, Lactuca serriola, Helianthus annuus, and Oenothera caespitosa. The response occurred when water was injected into the intercellular spaces, vacuum infiltrated into the intercellular spaces, or forced into the intercellular spaces by pressurizing the xylem. Injecting 50 mM ...
DOI:
10.1104/pp.110.157685
PubMed:
20472750
PubMed Central:
PMC2899896

2. The Mechanisms Involved in Seed Dormancy Alleviation by Hydrogen Cyanide Unravel the Role of Reactive Oxygen Species as Key Factors of Cellular Signaling during Germination

Author:
Oracz, Krystyna; El-Maarouf-Bouteau, Hayat; Kranner, Ilse; Bogatek, Renata; Corbineau, Françoise; Bailly, Christophe
Source:
Plant physiology 2009 v.150 no.1 pp. 494-505
ISSN:
0032-0889
Subject:
Helianthus annuus; NADP (coenzyme); after-ripening; catalase; ethylene; gene expression; gluconeogenesis; glutathione; hydrogen cyanide; hydrogen peroxide; imbibition; lipids; mechanism of action; menadione; models; second messengers; seed dormancy; seed germination; sunflower seed; superoxide anion; superoxide dismutase
Abstract:
... The physiological dormancy of sunflower (Helianthus annuus) embryos can be overcome during dry storage (after-ripening) or by applying exogenous ethylene or hydrogen cyanide (HCN) during imbibition. The aim of this work was to provide a comprehensive model, based on oxidative signaling by reactive oxygen species (ROS), for explaining the cellular mode of action of HCN in dormancy alleviation. Bene ...
DOI:
10.1104/pp.109.138107
PubMed:
19329562
PubMed Central:
PMC2675718

3. The Catalytic Properties of Hybrid Rubisco Comprising Tobacco Small and Sunflower Large Subunits Mirror the Kinetically Equivalent Source Rubiscos and Can Support Tobacco Growth

Author:
Sharwood, Robert Edward; von Caemmerer, Susanne; Maliga, Pal; Whitney, Spencer Michael
Source:
Plant physiology 2008 v.146 no.1 pp. 83-96
ISSN:
0032-0889
Subject:
Helianthus annuus; Nicotiana tabacum; apical meristems; carboxylation; chlorophyll; fluorescence; gas exchange; genes; hybrids; leaves; lighting; messenger RNA; phenotype; plant architecture; ribulose-bisphosphate carboxylase; seedlings; seeds; stem elongation; tobacco
Abstract:
... Plastomic replacement of the tobacco (Nicotiana tabacum) Rubisco large subunit gene (rbcL) with that from sunflower (Helianthus annuus; rbcLS) produced tobaccoRst transformants that produced a hybrid Rubisco consisting of sunflower large and tobacco small subunits (LsSt). The tobaccoRst plants required CO₂ (0.5% v/v) supplementation to grow autotrophically from seed despite the substrate saturated ...
DOI:
10.1104/pp.107.109058
PubMed:
17993544
PubMed Central:
PMC2230571

4. Helianthus Nighttime Conductance and Transpiration Respond to Soil Water But Not Nutrient Availability

Author:
Howard, Ava R.; Donovan, Lisa A.
Source:
Plant physiology 2007 v.143 no.1 pp. 145-155
ISSN:
0032-0889
Subject:
Helianthus annuus; Helianthus petiolaris; gas exchange; leaves; mass flow; nutrient availability; plant reproduction; roots; soil nutrients; soil water; soil water content; stomatal conductance
Abstract:
... We investigated the response of Helianthus species nighttime conductance (gnight) and transpiration (Enight) to soil nutrient and water limitations in nine greenhouse studies. The studies primarily used wild Helianthus annuus, but also included a commercial and early domesticate of H. annuus and three additional wild species (Helianthus petiolaris Nutt., Helianthus deserticola Heiser, and Helianth ...
DOI:
10.1104/pp.106.089383
PubMed:
17142487
PubMed Central:
PMC1761982

5. Impacts of T-Phylloplanin Gene Knockdown and of Helianthus and Datura Phylloplanins on Peronospora tabacina Spore Germination and Disease Potential

Author:
Kroumova, Antoaneta B.; Shepherd, Ryan W.; Wagner, George J.
Source:
Plant physiology 2007 v.144 no.4 pp. 1843-1851
ISSN:
0032-0889
Subject:
RNA interference; Helianthus annuus; Glycine max; leaf protein; messenger RNA; Datura stramonium; plant diseases and disorders; Peronospora tabacina; trichomes; soybeans; pathogens; Nicotiana tabacum; Datura metel; genes; spore germination; tobacco; leaves; antifungal properties
Abstract:
... T-phylloplanin proteins secreted to aerial surfaces of tobacco (Nicotiana tabacum) by short procumbent trichomes inhibit spore germination and blue mold disease caused by the oomycete pathogen Peronospora tabacina. Many other plants were found to contain water-washed leaf surface proteins (phylloplanins), but the functions and properties of these are not known. Here we extend earlier evidence for ...
DOI:
10.1104/pp.107.097584
PubMed:
17573541
PubMed Central:
PMC1949898

6. Lateral CO₂ Diffusion inside Dicotyledonous Leaves Can Be Substantial: Quantification in Different Light Intensities

Author:
Morison, James I.L.; Lawson, Tracy; Cornic, Gabriel
Source:
Plant physiology 2007 v.145 no.3 pp. 680-690
ISSN:
0032-0889
Subject:
Vicia faba; Helianthus annuus; Zea mays; tobacco; Petunia hybrida; fluorescence; gas exchange; faba beans; corn; leaf area; Phaseolus vulgaris; light intensity; Nicotiana tabacum; photosynthesis; chlorophyll; stomata
Abstract:
... Substantial lateral CO₂ diffusion rates into leaf areas where stomata were blocked by grease patches were quantified by gas exchange and chlorophyll a fluorescence imaging in different species across the full range of photosynthetic photon flux densities (PPFD). The lateral CO₂ flux rate over short distances was substantial and very similar in five dicotyledonous species with different vascular an ...
DOI:
10.1104/pp.107.107318
PubMed:
17905868
PubMed Central:
PMC2048780

7. Modification of Leaf Apoplastic pH in Relation to Stomatal Sensitivity to Root-Sourced Abscisic Acid Signals

Author:
Jia, Wensuo; Davies, William John
Source:
Plant physiology 2007 v.143 no.1 pp. 68-77
ISSN:
0032-0889
Subject:
stomatal movement; tomatoes; Helianthus annuus; soil water content; Commelina communis; nitrogen; shoots; signal transduction; transpiration; sap; nitrates; pH; protons; abscisic acid; stomata; xylem; roots; Solanum lycopersicum var. lycopersicum
Abstract:
... The confocal microscope was used to determine the pH of the leaf apoplast and the pH of microvolumes of xylem sap. We quantified variation in leaf apoplast and sap pH in relation to changes in edaphic and atmospheric conditions that impacted on stomatal sensitivity to a root-sourced abscisic acid signal. Several plant species showed significant changes in the pH of both xylem sap and the apoplast ...
DOI:
10.1104/pp.106.089110
PubMed:
17098853
PubMed Central:
PMC1761989

8. Improved Resistance to Controlled Deterioration in Transgenic Seeds

Author:
Prieto-Dapena, Pilar; Castaño, Raúl; Almoguera, Concepción; Jordano, Juan
Source:
Plant physiology 2006 v.142 no.3 pp. 1102-1112
ISSN:
0032-0889
Subject:
Helianthus annuus; Nicotiana tabacum; crops; gene expression; heat shock proteins; heat stress; heat tolerance; imbibition; longevity; oligosaccharides; plant development; seed yield; seeds; tobacco; transcription factors
Abstract:
... We show that seed-specific overexpression of the sunflower (Helianthus annuus) HaHSFA9 heat stress transcription factor (HSF) in tobacco (Nicotiana tabacum) enhances the accumulation of heat shock proteins (HSPs). Among these proteins were HSP101 and a subset of the small HSPs, including proteins that accumulate only during embryogenesis in the absence of thermal stress. Levels of late embryogenes ...
DOI:
10.1104/pp.106.087817
PubMed:
16998084
PubMed Central:
PMC1630740

9. Functional Interaction between Two Transcription Factors Involved in the Developmental Regulation of a Small Heat Stress Protein Gene Promoter

Author:
Díaz-Martín, Juan; Almoguera, Concepción; Prieto-Dapena, Pilar; Espinosa, José M.; Jordano, Juan
Source:
Plant physiology 2005 v.139 no.3 pp. 1483-1494
ISSN:
0032-0889
Subject:
heat shock proteins; transcription factors; transcriptional activation; Helianthus annuus; plant biochemistry; plant genetics; amino acid sequences; promoter regions
Abstract:
... Hahsp17.6G1 is the promoter of a small heat stress protein (sHSP) from sunflower (Helianthus annuus) that is activated during zygotic embryogenesis, but which does not respond to heat stress. We report here the cloning of a transcription factor (TF), sunflower drought-responsive element binding factor 2 (HaDREB2), by one-hybrid interaction with functional cis-elements in Hahsp17.6G1. We have analy ...
DOI:
10.1104/pp.105.069963
PubMed:
16244139
PubMed Central:
PMC1283783

10. Lateral Diffusion of CO₂ in Leaves Is Not Sufficient to Support Photosynthesis

Author:
Morison, James I.L.; Galloue̊t, Emily; Lawson, Tracy; Cornic, Gabriel; Herbin, Raphaèle; Baker, Neil R.
Source:
Plant physiology 2005 v.139 no.1 pp. 254-266
ISSN:
0032-0889
Subject:
Commelina communis; Helianthus annuus; Phaseolus vulgaris; beans; leaves; photosynthesis; carbon dioxide; diffusion; gas exchange; chlorophyll; fluorescence; plant physiology
Abstract:
... Lateral diffusion of CO₂ was investigated in photosynthesizing leaves with different anatomy by gas exchange and chlorophyll a fluorescence imaging using grease to block stomata. When one-half of the leaf surface of the heterobaric species Helianthus annuus was covered by 4-mm-diameter patches of grease, the response of net CO₂ assimilation rate (A) to intercellular CO₂ concentration (C[subscript ...
DOI:
10.1104/pp.105.062950
PubMed:
16113223
PubMed Central:
PMC1203375

11. Nitrate does not result in iron inactivation in the apoplast of sunflower leaves

Author:
Nikolic, M.; Romheld, V.
Source:
Plant physiology 2003 v.132 no.3 pp. 1303-1314
ISSN:
0032-0889
Subject:
plant growth; nutrient transport; Helianthus annuus; iron; nutrient uptake; sap; pH; chlorosis; nutrient solutions; xylem; chlorophyll; ammonium nitrate; leaves
DOI:
10.1104/pp.102.017889
PubMed:
12857812
PubMed Central:
PMC167070

12. Overexpression of a gene encoding hydrogen peroxide-generating oxalate oxidase evokes defense responses in sunflower

Author:
Hu, X.; Bidney, D.L.; Yalpani, N.; Duvick, J.P.; Crasta, O.; Folkerts, O.; Lu, G.H.
Source:
Plant physiology 2003 v.133 no.1 pp. 170-181
ISSN:
0032-0889
Subject:
Helianthus annuus; lesions (plant); wheat; plant pathogenic fungi; salicylic acid; hydrogen peroxide; fungal diseases of plants; Triticum aestivum; Sclerotinia sclerotiorum; gene overexpression; host plants; pathogenesis-related proteins; hypersensitive response; grain crops; transgenes; biosynthesis; transgenic plants; oxidoreductases; nucleotide sequences
DOI:
10.1104/pp.103.024026
PubMed:
12970484
PubMed Central:
PMC196595

13. Reversible heat-induced inactivation of chimeric beta-glucuronidase in transgenic plants

Author:
Almoguera, C.; Rojas, A.; Jordano, J.
Source:
Plant physiology 2002 v.129 no.1 pp. 333-341
ISSN:
0032-0889
Subject:
Helianthus annuus; Nicotiana tabacum; tobacco; transgenic plants; seedlings; seeds; plant proteins; heat shock proteins; recombinant proteins; gene expression; messenger RNA; biosynthesis; heat stress; beta-glucuronidase; genetic markers; protein products; enzyme activity; temperature; plant extracts; amino acid sequences; nucleotide sequences; chemical constituents of plants; transcription (genetics); stress response
Abstract:
... We compared the expression patterns in transgenic tobacco (Nicotiana tabacum) of two chimeric genes: a translational fusion to beta-glucuronidase (GUS) and a transcriptional fusion, both with the same promoter and 5'-flanking sequences of Ha hsp17.7 G4, a small heat shock protein (sHSP) gene from sunflower (Helianthus annuus). We found that immediately after heat shock, the induced expression from ...
PubMed:
12011363
PubMed Central:
PMC155896

14. Selective activation of the developmentally regulated Ha hsp17.6 G1 promoter by heat stress transcription factors

Author:
Rojas, A.; Almoguera, C.; Carranco, R.; Scharf, K.D.; Jordano, J.
Source:
Plant physiology 2002 v.129 no.3 pp. 1207-1215
ISSN:
0032-0889
Subject:
Helianthus annuus; Solanum peruvianum; promoter regions; plant proteins; tomatoes; heat stress; response elements; Nicotiana tabacum; transcription factors; mutation; oilseed crops; tobacco; heat shock proteins; protoplasts; transcriptional activation; transgenic plants; embryo (plant); Saccharomyces cerevisiae; binding sites; DNA-binding proteins; chemical constituents of plants
Abstract:
... Using two well-characterized heat stress transcription factors (Hsfs) from tomato (Lycopersicon peruvianum; LpHsfA1 and LpHsfA2), we analyzed the transcriptional activation of the Ha hsp17.6 G1 promoter in sunflower (Helianthus annuus) embryos. In this system, we observed transient promoter activation only with LpHsfA2. In contrast, both factors were able to activate mutant versions of the promote ...
PubMed:
12114574
PubMed Central:
PMC166514

15. Cavitation fatigue. Embolism and refilling cycles can weaken the cavitation resistance of xylem

Author:
Hacke, U.G.; Stiller, V.; Sperry, J.S.; Pittermann, J.; McCulloh, K.A.
Source:
Plant physiology 2001 v.125 no.2 pp. 779-786
ISSN:
0032-0889
Subject:
Alnus incana; Populus angustifolia; Populus tremuloides; Helianthus annuus; Aesculus hippocastanum; petioles; stems; xylem; Acer negundo; soil water content; water stress; drought; permeability; cellulose
Abstract:
... Although cavitation and refilling cycles could be common in plants, it is unknown whether these cycles weaken the cavitation resistance of xylem. Stem or petiole segments were tested for cavitation resistance before and after a controlled cavitation-refilling cycle. Cavitation was induced by centrifugation, air drying of shoots, or soil drought. Except for droughted plants, material was not signif ...
PubMed:
11161035
PubMed Central:
PMC64879

16. Cell-type-specific expression of plant cytochrome c mRNA in developing flowers and roots

Author:
Ribichich, K.F.; Tioni, M.F.; Chan, R.L.; Gonzalez, D.H.
Source:
Plant physiology 2001 v.125 no.4 pp. 1603-1610
ISSN:
0032-0889
Subject:
plant development; messenger RNA; Helianthus annuus; corolla; anthers; flower primordia; gene expression; cytochrome c; xylem; meiosis; roots
Abstract:
... We have used RNA in situ hybridization to analyze the expression of transcripts encoding cytochrome c in different tissues and organs of sunflower (Helianthus annuus). Although northern-blot hybridization experiments indicate that the relative abundance of transcripts does not vary greatly, we have detected important changes in localization during flower development. Enhanced expression is observe ...
PubMed:
11299342
PubMed Central:
PMC88818

17. Does growth correlate with turgor-induced elastic strain in stems? A re-evaluation of de Vries classical experiments

Author:
Peters, W.S.; Farm, M.S.; Kopf, A.J.
Source:
Plant physiology 2001 v.125 no.4 pp. 2173-2179
ISSN:
0032-0889
Subject:
Helianthus annuus; turgor; hypocotyls; seedling growth; cell walls; light; seedlings; etiolation
Abstract:
... The correlation between growth and turgor-induced elastic expansion was studied in hypocotyls of sunflower (Helianthus annuus) seedlings under various growth conditions. Turgor-induced elastic cell wall strain was greater in hypocotyls of faster growing seedlings, i.e. in etiolated versus light-grown ones. It also was higher in rapidly growing young seedlings as compared with nongrowing mature one ...
PubMed:
11299396
PubMed Central:
PMC88872

18. The mechanic state of "inner tissue" in the growing zone of sunflower hypocotyls and the regulation of its growth rate following excision

Author:
Peters, W.S.; Tomos, A.D.
Source:
Plant physiology 2000 v.123 no.2 pp. 605-612
ISSN:
0032-0889
Subject:
Helianthus annuus; hypocotyls; turgor; plasmolysis; plant tissues; water uptake; length
PubMed:
10859190
PubMed Central:
PMC59028

19. Apoplastic pH and Fe3+ reduction in intact sunflower leaves

Author:
Kosegarten, H.U.; Hoffmann, B.; Mengel, K.
Source:
Plant physiology 1999 v.121 no.4 pp. 1069-1079
ISSN:
0032-0889
Subject:
Helianthus annuus; hydrogen ions; cell walls; fluorescence; nutrient deficiencies; iron; ion transport; oxidoreductases; plant veins; sap; pH; chlorosis; plasma membrane; xylem; enzyme activity; ammonium nitrate; leaves
Abstract:
... It has been hypothesized that under NO3(-) nutrition a high apoplastic pH in leaves depresses Fe(3+) reductase activity and thus the subsequent Fe(2+) transport across the plasmalemma, inducing Fe chlorosis. The apoplastic pH in young green leaves of sunflower (Helianthus annuus L.) was measured by fluorescence ratio after xylem sap infiltration. It was shown that NO3(-) nutrition significantly in ...

20. Identification, separation, and characterization of acyl-coenzyme A dehydrogenases involved in mitochondrial beta-oxidation in higher plants

Author:
Bode, K.; Hooks, M.A.; Couee, I.
Source:
Plant physiology 1999 v.119 no.4 pp. 1305-1314
ISSN:
0032-0889
Subject:
seed germination; root tips; Zea mays; Helianthus annuus; seeds; peroxisomes; complementary DNA; assays; catalase; biochemical pathways; mitochondria; acyl-CoA dehydrogenase; oxidation; nucleotide sequences; enzyme activity; hydro-lyases
Abstract:
... The existence in higher plants of an additional beta-oxidation system in mitochondria, besides the well-characterized peroxisomal system, is often considered controversial. Unequivocal demonstration of beta-oxidation activity in mitochondria should rely on identification of the enzymes specific to mitochondrial beta-oxidation. Acylcoenzyme A dehydrogenase (ACAD) (EC 1.3.99.2,3) activity was detect ...

21. Plastome engineering of ribulose-1,5-bisphosphate carboxylase/oxygenase in tobacco to form a sunflower large subunit and tobacco small subunit hybrid

Author:
Kanevski, I.; Maliga, P.; Rhoades, D.F.; Gutteridge, S.
Source:
Plant physiology 1999 v.119 no.1 pp. 133-141
ISSN:
0032-0889
Subject:
Nicotiana tabacum; Helianthus annuus; Synechococcus; plastids; genetic transformation; gene transfer; genetic engineering; genetic markers; genetic code; ribulose-bisphosphate carboxylase; photosynthesis; enzyme activity; transgenic plants; hybrids; genetic variation; amino acid sequences
Abstract:
... Targeted gene replacement in plastids was used to explore whether the rbcL gene thatcodes for the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase, the key enzyme of photosynthetic CO2 fixation, might be replaced with altered forms of the gene. Tobacco (Nicotiana tabacum) plants were transformed with plastid DNA that contained the rbcL gene from either sunflower (Helianthus annuus) ...
PubMed:
9880354
PubMed Central:
PMC32212

22. Ribulose-1,5-bisphosphate carboxylase/oxygenase content, assimilatory charge, and mesophyll conductance in leaves

Author:
Eichelmann, H.; Laisk, A.
Source:
Plant physiology 1999 v.119 no.1 pp. 179-189
ISSN:
0032-0889
Subject:
Helianthus annuus; Gossypium hirsutum; Phaseolus vulgaris; mesophyll; photosynthesis; ribulose-bisphosphate carboxylase; enzyme activity; measurement; light intensity; mathematical models; equations; chemical constituents of plants; Rumex patientia
Abstract:
... The content of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) (Et; EC 4.1.1.39) measured in different-aged leaves of sunflower (Helianthus annuus) and other plants grown under different light intensities, varied from 2 to 75 micromole active sites m-2 mesophyll conductance (micro) was measured under 1.5% O2, as well as postillumination CO2 uptake (assimilatory charge, a gas-exchange mea ...

23. Water deficit and spatial pattern of leaf development. Variability in responses can be simulated using a simple model of leaf development

Author:
Granier, C.; Tardieu, F.
Source:
Plant physiology 1999 v.119 no.2 pp. 609-619
ISSN:
0032-0889
Subject:
Helianthus annuus; water stress; leaves; plant development; mathematical models; spatial distribution; cell division; soil water content; leaf water potential; abscisic acid; xylem; sap; photosynthesis; leaf area; heat sums; light intensity; air temperature; photoperiod
Abstract:
... We analyzed the effect of short-term water deficits at different periods of sunflower (Helianthus annuus L.)leaf development on the spatial and temporal patterns of tissue expansion and epidermal cell division. Six water-deficit periods were imposed with similar and constant values of soil water content, predawn leaf water potential and [ABA] in the xylem sap, and with negligible reduction of the ...

24. Molecular and physiological responses to water deficit in drought-tolerant and drought-sensitive lines of sunflower. Accumulation of dehydrin transcripts correlates with tolerance

Author:
Cellier, F.; Conejero, G.; Breitler, J.C.; Casse, F.
Source:
Plant physiology 1998 v.116 no.1 pp. 319-328
ISSN:
0032-0889
Subject:
turgor; Helianthus annuus; protein synthesis; biosynthesis; phenotype; stress response; drought tolerance; genetic variation; water stress; gene expression; transcription (genetics); genes; genotype; abscisic acid; stomata; shoots
Abstract:
... To investigate correlations between phenotypic adaptation to water limitation and drought-induced gene expression, we have studied a model system consisting of a drought-tolerant line (R1) and a drought-sensitive line (S1) of sunflowers (Helianthus annuus L.) subjected to progressive drought. R1 tolerance is characterized by the maintenance of shoot cellular turgor. Drought-induced genes (HaElip1, ...
PubMed:
9499218
PubMed Central:
PMC35172

25. Nonphotochemical reduction of the plastiquinone pool in sunflower leaves originates from chlororespiration

Author:
Feild, T.S.; Nedbal, L.; Ort, D.R.
Source:
Plant physiology 1998 v.116 no.4 pp. 1209-1218
ISSN:
0032-0889
Subject:
far-red light; Helianthus annuus; quantitative analysis; membrane potential; quinones; fluorescence; rotenone; electron transfer; leaves; adenosinetriphosphatase; oxidation; cell membranes; chemical constituents of plants; enzyme activity; chloroplasts; measurement
Abstract:
... We investigated the relationship between nonphotochemical plastoquinone reduction and chlororespiration in leaves of growth-chamber-grown sunflower (Helianthus annuus L.).Following a short induction period, leaves of previously illuminated sunflower showed a substantially increased level of minimal fluorescence following a light-to-dark transition. This increase in minimal fluorescence was reverse ...

26. Spatial and temporal analyses of expansion and cell cycle in sunflower leaves: a common pattern of development for all zones of a leaf and different leaves of a plant

Author:
Grainer, C.; Tardieu, F.
Source:
Plant physiology 1998 v.116 no.3 pp. 991-1001
ISSN:
0032-0889
Subject:
mathematical models; Helianthus annuus; cell growth; stems; equations; developmental stages; leaf area; cell division; measurement; leaves
Abstract:
... We have investigated the spatial distributions of expansion and cell cycle in sunflower (Helianthus annuus L.) leaves located at two positions on the stem, from leaf initiation to the end of expansion. Relative expansion rate (RER) was analyzed by following the deformation of a grid drawn on the lamina; relative division rate (RDR) and flow-cytometry data were obtained in four zones perpendicular ...

27. Characterization of the variation potential in sunflower

Author:
Stankovic, B.; Zawadzki, T.; Davies, E.
Source:
Plant physiology 1997 v.115 no.3 pp. 1083-1088
ISSN:
0032-0889
Subject:
Helianthus annuus; xylem; membrane potential; turgor; proton pump; plasma membrane; ion exchange; stress response
Abstract:
... A major candidate for intercellular signaling in higher plants is the stimulus-induced systemic change in membrane potential known as variation potential (VP). We investigated the mechanism of occurrence and long-distance propagation of VP in sunflower (Helianthus annuus L.) plants. Here we present evidence of the relationship among injury-induced changes in xylem tension, turgor pressure, and ele ...

28. Importance of the chiral centers of jasmonic acid in the responses of plants. Activities and antagonism between natural and synthetic analogs

Author:
Holbrook, L.; Tung, P.; Ward, K.; Reid, D.M.; Abrams, S.; Lamb, N.; Quail, J.W.; Moloney, M.M.
Source:
Plant physiology 1997 v.114 no.2 pp. 419-428
ISSN:
0032-0889
Subject:
Helianthus annuus; Brassica napus; measurement; chemical degradation; dose response; jasmonic acid; gene expression; Triticum aestivum; Nicotiana tabacum; esters; stereochemistry; enzyme activity; chemical structure; seed germination; transgenic plants; cotyledons; proteinase inhibitors; reporter genes; chemical constituents of plants; chlorophyll; beta-glucuronidase
Abstract:
... The importance of the two chiral centers at C-3 and C-7 in the molecular structure of jasmonic acid in plant responses was investigated. We separated methyl jasmonate (MeJA) into (3R)- and (3S)-isomers with a fixed stereochemistry at C-3, but epimerization at C-7 is possible. The four isomers of the nonepimerizable analog 7-methyl MeJA were synthesized. These six esters and their corresponding aci ...

29. Quantum yields and rate constants of photochemical and nonphotochemical excitation quenching. Experiment and model

Author:
Laisk, A.; Oja, V.; Rasulov, B.; Eichelmann, H.; Sumberg, A.
Source:
Plant physiology 1997 v.115 no.2 pp. 803-815
ISSN:
0032-0889
Subject:
Helianthus annuus; ion transport; light intensity; photoinhibition; measurement; carbon dioxide; dose response; Gossypium hirsutum; light harvesting complex; electron transfer; Sorghum bicolor; Nicotiana tabacum; leaves; Amaranthus cruentus; mathematical models; equations; net assimilation rate; temperature; prediction; cytochrome b
Abstract:
... Sunflower (Helianthus annuus L.), cotton (Gossypium hirsutum L.), tobacco (Nicotiana tabacum L.), sorghum (Sorghum bicolor Moench.), amaranth (Amaranthus cruentus L.), and cytochrome b6f complex-deficient transgenic tobacco leaves were used to test the response of plants exposed to different light intensities and CO2 concentrations before and after photoinhibition at 4000 micromoles photons m-2 s- ...

30. gamma-Aminobutyric acid stimulates ethylene biosynthesis in sunflower

Author:
Kathiresan, A.; Tung, P.; Chinnappa, C.C.; Reid, D.M.
Source:
Plant physiology 1997 v.115 no.1 pp. 129-135
ISSN:
0032-0889
Subject:
ethylene; messenger RNA; Helianthus annuus; biosynthesis; quantitative analysis; laccase; radiolabeling; cotyledons; transcription (genetics); carboxy-lyases; 1-aminocyclopropane-1-carboxylate synthase; gamma-aminobutyric acid; enzyme activity; aminoethoxyvinylglycine
Abstract:
... gamma-Aminobutyric acid (GABA), a nonprotein amino acid, is often accumulated in plants following environmental stimuli that can also cause ethylene production. We have investigated the relationship between GABA and ethylene production in excised sunflower (Helianthus annuus L.) tissues. Exogenous GABA causes up to a 14-fold increase in the ethylene production rate after about 12 h. Cotyledons fed ...
PubMed:
9306696
PubMed Central:
PMC158468

31. Differential accumulation of sunflower tetraubiquitin mRNAs during zygotic embryogenesis and developmental regulation of their heat-shock response

Author:
Almoguera, C.; Coca, M.A.; Jordano, J.
Source:
Plant physiology 1995 v.107 no.3 pp. 765-773
ISSN:
0032-0889
Subject:
Helianthus annuus; seed development; embryogenesis; developmental stages; ubiquitin; protein synthesis; heat stress; genes; messenger RNA; gene expression; nucleotide sequences; amino acid sequences; zygote; transcription (genetics); stress response
Abstract:
... We have isolated and sequenced Ha UbiS, a cDNA for a dry-seed-stored mRNA that encodes tetraubiquitin. We have observed differential accumulation of tetraubiquitin mRNAs during sunflower (Helianthus annuus L.) zygotic embryogenesis. These mRNAs were up-regulated during late embryogenesis and reached higher prevalence in the dry seed, where they were found to be associated mainly with provascular t ...

32. Stimulation by light of rapid pH regulation in the chloroplast stroma in vivo as indicated by CO2 solubilization in leaves

Author:
Hauser, M.; Eichelmann, H.; Oja, V.; Heber, U.; Laisk, A.
Source:
Plant physiology 1995 v.108 no.3 pp. 1059-1066
ISSN:
0032-0889
Subject:
Brassica oleracea; Helianthus annuus; Nicotiana tabacum; leaves; chloroplasts; pH; light; carbon dioxide; dose response; solubility; oxygen; gas exchange; quantitative analysis; bicarbonates
Abstract:
... Leaves of Brassica oleracea, Helianthus annuus, and Nicotiana rustica were exposed for 20 s to high concentrations of CO2. CO2 uptake by the leaf, which was very fast, was measured as a transient increase in the concentration of oxygen. Rapid solubilization of CO2 in excess of that which is physically dissolved in aqueous phases is proposed to be caused by bicarbonate formation in the stroma of ch ...

33. Blue light activates a specific protein kinase in higher plants

Author:
Reymond, P.; Short, T.W.; Briggs, W.R.
Source:
Plant physiology 1992 v.100 no.2 pp. 655-661
ISSN:
0032-0889
Subject:
Arabidopsis thaliana; Zea mays; Helianthus annuus; plant proteins; Cucurbita pepo; cell membranes; blue light; phosphorylation; membrane proteins; Pisum sativum; enzyme activity; Solanum lycopersicum var. lycopersicum
Abstract:
... Blue light mediates the phosphorylation of a membrane protein in seedlings from several plant species. When crude microsomal membrane proteins from dark-grown pea (Pisum sativum L.), sunflower (Helianthus annuus L.), zucchini Cucurbita pepo L.), Arabidopsis (Arabidopsis thaliana L.), or tomato (Lycopersicon esculentum L.) stem segments, or from maize (Zea mays L.), barley (Hordeum vulgare L.), oat ...
DOI:
10.1104/pp.100.2.655
PubMed:
16653043

34. Control of leaf expansion by nitrogen nutrition in sunflower plants. Role of hydraulic conductivity and turgor

Author:
Radin, J.W.; Boyer, J.S.
Source:
Plant physiology 1982 v.69 no.4 pp. 771-775
ISSN:
0032-0889
Subject:
Helianthus annuus
Abstract:
... Nitrogen nutrition strongly affected the growth rate of young sunflower (Helianthus annuus L.) leaves. When plants were grown from seed on either of two levels of N availability, a 33% decrease in tissue N of expanding leaves was associated with a 75% overall inhibition of leaf growth. Almost all of the growth inhibition resulted from a depression of the daytime growth rate. Measurements of pressu ...
Handle:
10113/3757
DOI:
10.1104/pp.69.4.771
PubMed:
16662294
PubMed Central:
PMC426303