Heat injury of barley leaves detected by the chlorophyll fluorescence temperature curve

Nauš, Jan; Kuropatwa, R.; Klinkovskÿ, Tomáš; Ilı́k, Petr; Lattová, Jitka; Pavlová, Zdeñka

doi:10.1016/0005-2728(92)90093-h

Cited by 38 publications

(21 citation statements)

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“…Our data suggest that the quantum yield of light reaction was a useful tool to quantify occurrence and intensity of drought stress in barley. The use of chlorophyll fluorescence from intact, attached leaves proved to be a reliable, nondestructive method in physiological studies [21] and has been extensively used for assessing barley response to heat stress [16], salt stress [4], chilling tolerance [12] and water stress [15].…”

Section: Quantification Of Drought Stressmentioning

confidence: 99%

Effects of drought stress on growth and yield of barley

Samarah

2005

Agron. Sustain. Dev.

279

123

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-Barley (Hordeum vulgare) grown in Mediterranean regions undergoes drought stress during the grain-filling period. A greenhouse experiment was conducted to study the effect of drought stress on grain growth and yield of barley. Plants were exposed to three drought treatments at the beginning of grain filling: (1) well-watered at 100% field capacity, (2) mild drought stress at 60% field capacity, and (3) severe drought stress at 20% field capacity until grain maturity. Grain moisture content and dry weight were determined for grains harvested at 3, 10, 17, 23 and 31 days after the beginning of grain filling. Grain dry weight for severe drought stress plants reached a maximum value earlier than grains from mild drought stress and well-watered plants, indicating that grains from severe drought stress plants had a higher growth rate than those of mild drought stress and well-watered plants. Drought-stressed plants had shorter duration of grain filling than well-watered plants. Drought stress treatments reduced grain yield by reducing the number of tillers, spikes and grains per plant and individual grain weight. In conclusion, postanthesis drought stress was detrimental to grain yield regardless of the stress severity.Hordeum vulgare / drought tolerance / beginning of grain filling / grain maturity / grain development

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Section: Quantification Of Drought Stressmentioning

confidence: 99%

Effects of drought stress on growth and yield of barley

Samarah

2005

Agron. Sustain. Dev.

279

123

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“…In the temperature interval from 35 to 45 °C an initiation of some adverse processes as a damage to the oxygen evolving complex (Havaux and Gruszecki 1993), dissociation of the oligomeric form of the light-harvesting complex 2 (LHC2) into monomeric ones and their separation from photosystem 2 (PS2) have been postulated --- (Havaux and Tardy 1997). At temperatures of about 40 °C the F intensity begins to increase up to the first maximum, designated M 1 (Nauš et al 1992b). The M 1 maximum appears around 50 °C.…”

Section: Introductionmentioning

confidence: 99%

“…For the maximal temperatures above the first maximum of the curve, the F response has been mostly irreversible. The reversibility of FTC (barley leaves at a low actinic excitation) under a heating regime consisting of the linear increase of temperature (0.0833 ºC s −1 ), followed by a period of constant temperature (linear-constant heating regime), has been studied (Nauš et al 1992a). Two starting temperatures of irreversible F changes, designed T C1 and T C2 , have been found within FTC.…”

Section: Introductionmentioning

confidence: 99%

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Irreversible changes in barley leaf chlorophyll fluorescence detected by the fluorescence temperature curve in a linear heating/cooling regime

Frolec¹,

Ilı́k²,

Krchňák³

et al. 2008

Photosynt.

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The chlorophyll fluorescence (F) temperature curves in a linear time-temperature heating/cooling regime were used to study heat-induced irreversible F changes in primary green leaves of spring barley (Hordeum vulgare L. cv. Akcent). The leaf segments were heated in a stirred water bath at heating rates of 0.0083, 0.0166, 0.0333, and 0.0500 °C s −1 from room temperature up to maximal temperature T m and then linearly cooled to 35 °C at the same rate. The F intensity was measured by a pulse-modulated technique. The results support the existence of the two critical temperatures of irreversible F changes postulated earlier, at 45−48 and 53−55 °C. The critical temperatures are slightly dependent on the heating rate. Two types of parameters were used to characterize the irreversibility of the F changes: the coefficient of irreversibility μ defined as the ratio of F intensity at 35 °C at the starting/ending parts of the cycle and the slopes of tangents of linear parts of the F temperature curve. The dependence of μ on T m revealed a maximum, which moved from 54 to 61 °C with the increasing heating/cooling rate ν from 0.0083 to 0.0500 ºC s −1 , showing two basic phases of the irreversible changes. The Arrhenius and Eyring approaches were applied to calculate the activation energies of the initial increase in μ. The values varied between 30 and 50 kJ mol −1 and decreased slightly with the increasing heating rate.

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“…1). An increase in constant fluorescence was previously noticed in stressed plant systems, such as heated leaves and Fe-limited algae (Naus et al 1992, Belkhodja et al 1998. Among other factors, it has been suggested that an increase in F o may be caused by an alteration of electron transport in PSII reaction centres (Schreiber & Armond 1978) and/or by a disconnection of LHCs from PSII (Yamane et al 1997).…”

Section: Effects On Chloroplast Morphology and Photosynthetic Apparatmentioning

confidence: 65%

Effects of viral infection on photosynthetic processes in the bloom-forming alga Heterosigma akashiwo

Juneau¹,

Lawrence²,

Suttle³

et al. 2003

Aquat. Microb. Ecol.

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Pulse-amplitude-modulated (PAM) fluorescence is a technique that allows rapid assessment of photosynthetic activity of phytoplankton. This approach was used to evaluate the effect of viral infection on the photosynthesis of Heterosigma akashiwo, a toxic bloom-forming raphidophyte found in coastal waters of Japan and Canada. We found that viral infection caused by a single strand RNA virus (HaRNAV Strain 263) and 2 uncharacterised DNA viruses (Strains WBs1 and OIs1) gradually impaired photosynthetic activity during the lytic cycle and that photosynthetic electron transport was directly affected by viral infection. Photosystem (PS) II quantum yield of the active reaction centre was much less affected than the overall PSII-PSI electron transport. The decrease in the photosynthetic activity of the infected algae promoted the non-photochemical energy dissipation (heat). Furthermore, the lytic cycle of the viruses was of similar duration in darkness as in the light (ca. 100 h), and therefore it was not dependent on photophosphorylation. Our study demonstrates that the sensitivity of PAM fluorometry makes it a useful tool for studying viral infection in phytoplankton populations. Moreover, the results have implications for understanding the role of viral infection on the bloom dynamics of H. akashiwo by showing that viral replication is not lightdependent. Hence, viral production can occur below the photic zone. KEY WORDS: Viral infection · Photosynthetic activity · PAM chlorophyll fluorescence · Heterosigma akashiwo Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 31: 9-17, 2003 Etten et al. 1983). In some instances viral infection leads to the immediate suppression of photosynthetic activity (Van Etten et al. 1983), whereas in other cases photosynthesis continues to the point of the complete lysis of the population (Mackenzie & Haselkorn 1972, Allen & Hutchison 1976, Suttle & Chan 1993. Even similar viruses can have very different effects on their hosts. For example, both M. pusilla virus (MpV) and the Chlorella virus (PBCV1) are members of the family Phycodnaviridae, but photosynthesis is altered by infection more quickly in Chlorella than in M. pusilla (Waters & Chan 1982, Van Etten et al. 1983.One relatively simple way to determine photosynthetic activity, and thus gain insight into the physiological state of plants, is by chlorophyll a (chl a) fluorescence measurement (Lichtenthaler & Rinderle 1988, Bolhàr-Nordenkampf et al. 1989. A fraction of the light energy absorbed by plants is re-emitted as chl a fluorescence, a dissipation process that is in competition with non-radiative energy dissipation processes, both photochemical and non-photochemical (for a review see Lavorel & Etienne 1977). The level of emitted fluorescence is linked to the redox state of the Photosystem II (PSII) primary electron acceptor, Q A , and plastoquinone (PQ) pool. Upon illumination, the fluorescence signal increases rapidly due to the reduction of these electron acceptors. Ther...

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Heat injury of barley leaves detected by the chlorophyll fluorescence temperature curve

Cited by 38 publications

References 0 publications

Effects of drought stress on growth and yield of barley

Effects of drought stress on growth and yield of barley

Irreversible changes in barley leaf chlorophyll fluorescence detected by the fluorescence temperature curve in a linear heating/cooling regime

Effects of viral infection on photosynthetic processes in the bloom-forming alga Heterosigma akashiwo

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