Protective and injuring action of visible light on photosynthetic apparatus in wheat plants during hyperthermia treatment

Kislyuk, I. M.; Bubolo, L. S.; Bykov, O. D.; Kamentseva, I. E.; Sherstneva, O. A.

doi:10.1134/s102144370805004x

Cited by 8 publications

(6 citation statements)

References 23 publications

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“…For most temperate C3 species, in vivo rates of photosynthesis begin to decline above 25–28°C and severe damage to the photosystems is often observed above 35–40°C. Importantly, heat damage is more severe in the dark and physiological levels of light have a protective effect ( Kislyuk et al , 2008 ). To assess the effects of high temperatures on photosynthesis, the current study compared the time course of decline of photosynthetic quantum efficiency in leaves from wild-type and triple mutant fad3-2 fad7-2 fad8 Arabidopsis incubated at 40°C either in the dark or in the light.…”

Section: Resultsmentioning

confidence: 99%

Arabidopsis mutants reveal that short- and long-term thermotolerance have different requirements for trienoic fatty acids

Routaboul

Skidmore

Wallis

et al. 2011

Journal of Experimental Botany

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The photosynthetic thylakoid has the highest level of lipid unsaturation of any membrane. In Arabidopsis thaliana plants grown at 22°C, approximately 70% of the thylakoid fatty acids are trienoic – they have three double bonds. In Arabidopsis, and other species, the levels of trienoic fatty acids decline substantially at higher temperatures. Several genetic studies indicate that reduced unsaturation improves photosynthetic function and plant survival at high temperatures. Here, these studies are extended using the Arabidopsis triple mutant, fad3-2 fad7-2 fad8 that contains no detectable trienoic fatty acids. In the short-term, fluorescence analyses and electron-transport assays indicated that photosynthetic functions in this mutant are more thermotolerant than the wild type. However, long-term photosynthesis, growth, and survival of plants were all compromised in the triple mutant at high temperature. The fad3-2 fad7-2 fad8 mutant is deficient in jasmonate synthesis and this hormone has been shown to mediate some aspects of thermotolerance; however, additional experiments demonstrated that a lack of jasmonate was not a major factor in the death of triple-mutant plants at high temperature. The results indicate that long-term thermotolerance requires a basal level of trienoic fatty acids. Thus, the success of genetic and molecular approaches to increase thermotolerance by reducing membrane unsaturation will be limited by countervailing effects that compromise essential plant functions at elevated temperatures.

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Section: Resultsmentioning

confidence: 99%

Arabidopsis mutants reveal that short- and long-term thermotolerance have different requirements for trienoic fatty acids

Routaboul

Skidmore

Wallis

et al. 2011

Journal of Experimental Botany

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“…A special type of protection by light against heat damage has been described for leaves of several temperate-climate species (Havaux and Strasser 1990;Havaux et al 1991;Kislyuk et al 2008;Marutani et al 2012). These studies show an inhibition of photosynthetic CO 2 assimilation and O 2 evolution upon moderate heat exposure of leaves in the dark that was ameliorated by low to moderate light.…”

Section: Discussionmentioning

confidence: 94%

Light-stimulated heat tolerance in leaves of two neotropical tree species, Ficus insipida and Calophyllum longifolium

Krause

Winter

Krause

et al. 2015

Functional Plant Biol.

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Abstract. Previous heat tolerance tests of higher plants have been mostly performed with darkened leaves. However, under natural conditions, high leaf temperatures usually occur during periods of high solar radiation. In this study, we demonstrate small but significant increases in the heat tolerance of illuminated leaves. Leaf disks of mature sun leaves from two neotropical tree species, Ficus insipida Willd. and Calophyllum longifolium Willd., were subjected to 15 min of heat treatment in the light (500 mmol photons m -2 s -1 ) and in the dark. Tissue temperatures were controlled by floating the disks on the surface of a water bath. PSII activity was determined 24 h and 48 h after heating using chlorophyll a fluorescence. Permanent tissue damage was assessed visually during long-term storage of leaf sections under dim light. In comparison to heat treatments in the dark, the critical temperature (T 50 ) causing a 50% decline of the fluorescence ratio F v /F m was increased by~1 C (from~52.5 C to~53.5 C) in the light. Moreover, illumination reduced the decline of F v /F m as temperatures approached T 50 . Visible tissue damage was reduced following heat treatment in the light. Experiments with attached leaves of seedlings exposed to increasing temperatures in a gas exchange cuvette also showed a positive effect of light on heat tolerance.

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“…The result, possibly, is caused by specificity in pigment organization which is different from that in CP43 (Zouni et al 2001). The greatest disarrangement of the outer antenna in relation to the CP43 complex of the inner antenna, which is specific for the heating in the presence of low light, maybe related to the protective effect of the low light (Weis 1982;Havaux et al 1991, Kalituho et al 2003Kisliuk et al 2008). In case, an energy flow to reaction centers is decreased and, in turn, the accumulation of electrons on Q A acceptor is decreased, then this results in reducing an extent of photoinhibition.…”

Section: Discussionmentioning

confidence: 99%

“…Heating at high temperatures evokes an efficient damage in photoactivity, in particular in PSII (Weis 1982;Sharkova and Buobolo 1996;Kisliuk et al 1997). Light of low intensity has been shown to protect photosynthesis from action of high-temperature heating (Weis 1982;Havaux et al 1991;Kalituho et al 2003;Kisliuk et al 2008;Kochubey et al 2010). It also reduces an extent of changes in chloroplast ultrastructure (Kisliuk et al 2008) as well as in chloroplast sizes (Kochubey et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Changes in antenna of photosystem II induced by short-term heating

Kochubey

2010

Photosynth Res

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Changes in antenna of photosystem II, induced by short-term heating, were studied using characteristics of a short-wavelength band in low-temperature fluorescence spectra (77 K) of pea chloroplasts. Heating for 5 min was carried out at 25 and 45°C in the darkness or in the presence of white light with intensity of 260 or 1,400 μmol/m(2)s. Most modes of thermal treating induced a decrease in integral intensity of the band and an increase of its half-width. The changes were more prominent at high-temperature heating. The second derivative of the contour of a short-wavelength band showed its three components around 680, 685, and 693 nm, the first of which belongs to emission of the outer antenna of Photosystem II, and the other two to its inner antenna. As the fourth derivative shows, high-temperature heating in the presence of light evokes an appearance of some additional components in a short-wavelength region (654, 658, 661, 666, 672, and 675 nm) as well as of two additional components, 682 and 689 nm, in the region of 685-nm peak. Two subcomponents, 692 and 694 nm, can be detected in the 693-nm component. The results are discussed on the basis of the data concerning energy levels and pathways of energy transfer in pigment-protein complexes of the outer and the inner antennas of photosystem II. It is assumed that a protective role of low light relates to inducing of an essential disarrangement in the outer and the inner antennas and of a subsequent decrease in energy funneling to reaction centers, which, in turn, lowers the extent of photoinhibition.

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Protective and injuring action of visible light on photosynthetic apparatus in wheat plants during hyperthermia treatment

Cited by 8 publications

References 23 publications

Arabidopsis mutants reveal that short- and long-term thermotolerance have different requirements for trienoic fatty acids

Arabidopsis mutants reveal that short- and long-term thermotolerance have different requirements for trienoic fatty acids

Light-stimulated heat tolerance in leaves of two neotropical tree species, Ficus insipida and Calophyllum longifolium

Changes in antenna of photosystem II induced by short-term heating

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