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Items from 1 to 16 out of 16 results

article

Drone‐based physiological index reveals long‐term acclimation and drought stress responses in trees

Petra D'Odorico, Leonie Schönbeck, Valentina Vitali, Katrin Meusburger, more

Plant, Cell & Environment > 44 > 11 > 3552 - 3570

Monitoring early tree physiological responses to drought is key to understanding progressive impacts of drought on forests and identifying resilient species. We combined drone‐based multispectral remote sensing with measurements of tree physiology and environmental parameters over two growing seasons in a 100‐y‐old Pinus sylvestris forest subject to 17‐y of precipitation manipulation. Our goal was...

article

Photoprotective response to chilling differs among high and low latitude Larrea divaricata grown in a common garden

Juliana S. Medeiros, Ashlee Begaye, David T. Hanson, Barry Logan, more

Journal of Arid Environments > 2015 > 120 > Complete > 51-54

Cold temperatures can cause imbalances between light absorption and photosynthetic light utilization, with potential negative consequences for leaf function. Consequently, in response to chilling evergreens typically exhibit increased total pools of photoprotective xanthophyll cycle pigments and greater nocturnal retention of energy dissipating forms. This may preclude opportunistic responses to transient...

article

Isoprenoids and phenylpropanoids are part of the antioxidant defense orchestrated daily by drought‐stressed Platanus × acerifolia plants during Mediterranean summers

Massimiliano Tattini, Francesco Loreto, Alessio Fini, Lucia Guidi, more

New Phytologist > 207 > 3 > 613 - 626

The hypothesis was tested that isoprenoids and phenylpropanoids play a prominent role in countering photooxidative stress, following the depletion of antioxidant enzyme activity in plants exposed to severe drought stress under high solar irradiance and high temperatures. Platanus × acerifolia, a high isoprene‐emitting species, was drought‐stressed during summer (WS) and compared with unstressed...

article

Physiological, biochemical, and ultrastructural responses of the green macroalga Urospora penicilliformis from Arctic Spitsbergen to UV radiation

Michael Y. Roleda, Ursula Lütz-Meindl, Christian Wiencke, Cornelius Lütz

Protoplasma > 2010 > 243 > 1-4 > 105-116

Exposure of the filamentous turf green alga Urospora penicilliformis to ambient and artificial ultraviolet radiation (UVR) revealed a considerable resilient species. This explains the ability of this alga to thrive in the middle–upper intertidal zones of the Arctic sea where it is periodically exposed to environmental extremes. A transient UVR effect on photosynthesis under photosynthetically active...

article

Improvement of ex vitro transfer of tobacco plantlets by addition of abscisic acid to the last subculture

J. Pospíšilová, D. Haisel, H. Synková, P. Baťková-Spoustová

Biologia Plantarum > 2009 > 53 > 4 > 617-624

Tobacco (Nicotiana tabacum L.) plantlets were grown on Murashige and Skoog medium in ventilated Magenta boxes and for the last subculture 10 µM ABA was added to the medium. After three weeks plantlets were transferred into pots with Perlite moistened with water and grown in controlled conditions (16-h photoperiod, day/night temperature 25/20 °C, air humidity about 45 %) either under low or high irradiance...

article

Effect of abscisic acid on photosynthetic parameters during ex vitro transfer of micropropagated tobacco plantlets

J. Pospíšilová, H. Synková, D. Haisel, P. Baťková

Biologia Plantarum > 2009 > 53 > 1 > 11-20

The aim of this research was to determine whether exogenous abscisic acid (ABA) applied immediately after ex vitro transfer of in vitro grown plants can improve their acclimatization. Tobacco (Nicotiana tabacum L.) plantlets were transferred into pots with Perlite initially moistened either by water or 50 µM ABA solution and they were grown under low (LI) or high (HI) irradiance of 150 and 700 µmol...

article

The impact of trans-zeatin O-glucosyltransferase gene over-expression in tobacco on pigment content and gas exchange

D. Haisel, R. Vaňoková, H. Synková, J. Pospíšilová

Biologia Plantarum > 2008 > 52 > 1 > 49-58

The responses of tobacco plants over-expressing trans-zeatin O-glucosyltransferase gene under constitutive or senescence-inducible promoter (35S:ZOG1 and SAG12:ZOG1) and of wild type (WT) plants to water stress and subsequent rehydration were compared. In plants sufficiently supplied with water, both transgenics have higher net photosynthetic rate (P_N) in upper and middle leaves and higher stomatal...

article

Photoacclimation of Dunaliella tertiolecta (Chlorophyceae) Under Fluctuating Irradiance

H. Havelková-Doušová, O. Prášil, M.J. Behrenfeld

Photosynthetica > 2004 > 42 > 2 > 273-281

We investigated photoacclimation of Dunaliella tertiolecta (Butcher) in irradiance (I) regimes simulating mixed layer conditions of turbid estuarine waters or lakes. D. tertiolecta was exposed to a range of fixed I regimes to establish baseline physiology-I relationships that were compared with subsequent photoacclimation to a simulated mixed layer. Measured indices of photoacclimation included cellular...

article

Photosynthetic UV-B Response of Beech (Fagus sylvatica L.) Saplings

M. Šprtová, V. Špunda, J. Kalina, M.V. Marek

Photosynthetica > 2003 > 41 > 4 > 533-543

Cloned saplings of beech (7-y-old) were exposed to enhanced UV-B irradiation (+25 %) continuously over three growing seasons (1999–2001). Analysis of CO₂ assimilation, variable chlorophyll (Chl) a fluorescence, and pigment composition was performed in late summer of the third growing season to evaluate the influence of long-term elevated UV-B irradiation. This influence was responsible for the stimulation...

article

The Susceptibility of Cucumber and Sweet Pepper to Chilling Under Low Irradiance is Related to Energy Dissipation and Water-Water Cycle

X.-G. Li, Q.-W. Meng, G.-Q. Jiang, Q. Zou

Photosynthetica > 2003 > 41 > 2 > 259-265

The photoprotection of energy dissipation and water-water cycle were investigated by comparing chilling sensitivity of photosystems 2 (PS2) and 1 (PS1) in two chilling-sensitive plants, cucumber and sweet pepper, upon exposure to 4 °C under low irradiance (100 μmol m⁻² s⁻¹) for 6 h. During chilling stress, the maximum photochemical efficiency of PS2 (F_v/F_m) decreased only slightly in both plants,...

article

Photosynthesis and photoprotection inNicotiana tabacumL.in vitro-grown plantlets

Petr Kadleček, Barbara Rank, Ingrid Tichá

Journal of Plant Physiology > 2003 > 160 > 9 > 1017-1024

Nicotiana tabacum L. plantlets were cultured in vitro photoautotrophically (0 % sucrose) and photomixotrophically (3 % or 5 % sucrose) at two irradiances (80 or 380 μmol m ⁻² s ⁻¹ ) with the aim of investigating the effect of these culture conditions on photosynthetic parameters and on protective systems against excess excitation energy. In plantlets grown photoautotrophically under...

article

Seasonal patterns of reflectance indices, carotenoid pigments and photosynthesis of evergreen chaparral species

C. Stylinski, J. Gamon, W. Oechel

Oecologia > 2002 > 131 > 3 > 366-374

This study examined the ability of the Photochemical Reflectance Index (PRI) to track seasonal variations in carotenoid pigments and photosynthetic activity of mature evergreen chaparral shrubs. Our results confirm that PRI scales with photosystem two (PSII) photochemical efficiency across species and seasons, as demonstrated by PRI's strong correlation with de-epoxidized (photoprotective) xanthophyll...

article

Responses of Tobacco Plantlets to Change of Irradiance During Transfer from in vitro to ex vitro Conditions

Š. Semorádová, H. Synková, J. Pospíšilová

Photosynthetica > 2002 > 40 > 4 > 605-614

Chlorophyll a fluorescence kinetics, net photosynthetic rate (P _N), water relations, and photosynthetic pigment contents were studied during acclimation of in vitro grown tobacco to higher irradiance (HL; 700 μmol m⁻² s⁻¹). Plantlets were grown on medium containing sucrose in glass vessels (G-plants) or in Magenta boxes (M-plants) with better CO₂ supply in the latter ones. The effect of HL was studied...

article

Photosynthetic pigments and gas exchange during ex vitro acclimation of tobacco plants as affected by CO2 supply and abscisic acid

Jana Pospíšilová, Daniel Haisel, Helena Synková, Jiří Čatský, more

Plant Cell, Tissue and Organ Culture (PCTOC) > 2000 > 61 > 2 > 125-133

Nicotiana tabacum L. plantlets were grown in glass vessels or in Magenta boxes with better CO₂ supply. To improve the ex vitro transfer we tested application of abscisic acid and elevated CO₂ concentration. In the first two weeks after transfer, net photosynthetic rate, chlorophyll a+b content, and Chl a/b ratio were higher, and content of xanthophyll cycle pigments lower in M-plants than in G-plants,...

article

Photosynthetic Pigments and Gas Exchange of in vitro Grown Tobacco Plants as Affected by CO2 Supply

D. Haisel, J. Pospíšilova, H. Synková, J. Čatský, more

Biologia Plantarum > 1999 > 42 > 3 > 463-468

Contents and functioning of photosynthetic pigments and gas exchange of Nicotiana tabacum L. leaves were studied in platlets cultivated in vitro under different CO₂ supply. The plantlets were grown for six weeks either in glass vessels tightly closed with aluminium foil (G-plants) or in polycarbonate Magenta GA-7 vessels covered with closures with microporous vents (M-plants). M-plants (better supplied...

article

Pigment composition of PS II pigment protein complexes purified by anion exchange chromatography. identification of xanthophyll cycle pigment binding proteins

Reimund Goss, Michael Richter, Aloysius Wild

Journal of Plant Physiology > 1997 > 151 > 1 > 115-119

The pigment composition of the chlorophyll binding proteins of Photosystem II (PS II) of spinach (Spinacea oleracea L.) has been determined using sucrose gradient ultracentrifugation, anion exchange chromatography and HPLC based pigment analysis. The xanthophyll cycle pigments violaxanthin, antheraxanthin and zeaxanthin were exclusively found in the proteins of the outer PS II antenna, with the highest...

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Keywords

XANTHOPHYLL CYCLE PIGMENTS (16)
CAROTENOIDS (8)
NET PHOTOSYNTHETIC RATE (7)
STOMATAL CONDUCTANCE (6)
CHLOROPHYLL FLUORESCENCE (5)
NICOTIANA TABACUM (4)
TRANSPIRATION RATE (4)
CHLOROPHYLL CONTENT (3)
ACCLIMATION (2)
CHLOROPHYLL A FLUORESCENCE (2)
CHLOROPHYLL CONTENTS (2)
CHLOROPHYLLS (2)
DROUGHT STRESS (2)
ELECTRON TRANSPORT RATE (2)
NICOTIANA TABACUM (2)
CAPSICUM ANNUUM (1)
CUCUMIS SATIVUS (1)
P–E CURVE (1)
>CHLOROPHYLL INDEX (1)
ABSORPTION AND FLUORESCENCE EXCITATION SPECTRA (1)
ANION EXCHANGE CHROMATOGRAPHY (1)
ANTIOXIDANT ENZYMES (1)
ASCORBATE PEROXIDASE (1)
ASCORBATE-GLUTATHIONE CYCLE ENZYMES (1)
CAROTENOID PIGMENTS (1)
CELL WALL MINERAL DEPOSITION (1)
CHLOROPHYLL (1)
CP 26 (1)
CP 29 (1)
DIURNAL COURSE (1)
DRONE (1)
EVERGREEN (1)
FLUORESCENCE (1)
FLUORESCENCE INDUCTION (1)
FUNCTIONAL TRAITS (1)
GROWTH RATE (1)
ISOPRENE EMISSION (1)
LHCII (1)
LIGHT STRESS (1)
MEP PATHWAY (1)
MONTE DESERT (1)
NORMALIZED DIFFERENCE (1)
P700 (1)
PHOTOAUTOTROPHY AND PHOTOMIXOTROPHY (1)
PHOTOCHEMICAL REFLECTANCE INDEX (1)
PHOTOINHIBITION (1)
PHOTOPROTECTION (1)
PHOTOSYNTHESIS (1)
PHOTOSYSTEM 2 (1)
PHOTOSYSTEM 2 ANTENNA SIZE (1)
PHOTOSYSTEMS 1 AND 2 (1)
PHYTOPLANKTON (1)
PRI (1)
PS II CORE PARTICLES (1)
QUERCETIN DERIVATIVES (1)
SPINACEA OLERACEA (1)
SUCROSE (1)
SUPEROXIDE DISMUTASE (1)
TRANSGENIC PLANTS (1)
UAV (1)
ULTRASTRUCTURE (1)
VEGETATION INDEX (1)
VERTICAL MIXING (1)
WARM DESERT EVERGREENS (1)
Α-TOCOPHEROL (1)
Β‐CAROTENE (1)
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