Relationship between the organization of the PSII supercomplex and the functions of the photosynthetic apparatus

Аpostolova, Emilia; Dobrikova, Anelia G.; Ivanová, P.; Петканчин, Ивана; Taneva, Stefka G.

doi:10.1016/j.jphotobiol.2005.12.012

Cited by 67 publications

(37 citation statements)

References 51 publications

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“…Similar results have also been observed after the exogenous addition of ascorbate and flavonoid naringin (Dobrikova et al, 2013;Dobrikova and Apostolova, 2014). Based on the previous investigations, which revealed that organization of LHCII influences on the oxygenevolving complex (Shutilova et al, 1995;Apostolova et al, 2006), we suppose that the effect of quercetin on the S 0 -S 1 state distribution is caused by the flavonoid-induced changes in thylakoid membranes. In addition, the data presented here demonstrate that the exogenous quercetin alleviates UV-B-induced inhibition of the oxygen evolution of thylakoid membranes, which depends on its location in the membranes i.e., when membranes are suspended at different pH of the medium (Fig.…”

Section: Discussionmentioning

confidence: 80%

Damage and protection of the photosynthetic apparatus from UV-B radiation. II. Effect of quercetin at different pH

Dobrikova

Аpostolova

2015

Journal of Plant Physiology

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Section: Discussionmentioning

confidence: 80%

Damage and protection of the photosynthetic apparatus from UV-B radiation. II. Effect of quercetin at different pH

Dobrikova

Аpostolova

2015

Journal of Plant Physiology

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“…Under these circumstances the downregulation of PSII by nonradiative energy dissipation is an essential defence mechanism (Qiu et al 2003). It has also been reported that PSII is usually more sensitive to stress conditions than PSI (Apostolova et al 2006). In fact, PSI activity may even be enhanced by salt as observed in cyanobacterium Spirulina platensis (Sudhir et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic responses of a wheat (Asakaze)-barley (Manas) 7H addition line to salt stress

Szopkó¹,

Darkó²,

Molnár³

et al. 2017

Photosynt.

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The photosynthetic responses to salt stress were examined in a wheat (Triticum aestivum L. cv. Asakaze) -barley (Hordeum vulgare L. cv. Manas) 7H addition line having elevated salt tolerance as compared to the parental wheat genotype. For this purpose, increasing NaCl concentrations up to 300 mM were applied and followed by a 7-day recovery period. Up to moderate salt stress (200 mM NaCl), forcible stomatal closure, parallel with a reduction in the net assimilation rate (P N ), was only observed in wheat, but not in the addition line or barley. Since the photosynthetic electron transport processes of wheat were not affected by NaCl, the impairment in P N could largely be accounted for the saltinduced decline in stomatal conductance (g s ), accompanied by depressed intercellular CO 2 concentration and carboxylation efficiency. Both, P N and nonstomatal limitation factors (L ns ) were practically unaffected by moderate salt stress in barley and in the addition line due to the sustained g s , which might be an efficient strategy to maintain the efficient photosynthetic activity and biomass production. At 300mM NaCl, both P N and g s decreased significantly in all the genotypes, but the changes in P N and L ns in the 7H addition line were more favourable similar to those in wheat. The downregulation of photosynthetic electron transport processes around PSII, accompanied by increases in the quantum yield of regulated energy dissipation and of the donor side limitation of PSI without damage to PSII, was observed in the addition line and barley during severe stress. Incomplete recovery of P N was observed in the addition line as a result of declined PSII activity probably caused by enhanced cyclic electron flow around PSI. These results suggest that the better photosynthetic tolerance to moderate salt stress of barley can be manifested in the 7H addition line which may be a suitable candidate for improving salt tolerance of wheat.Additional key words: chlorophyll fluorescence induction; improved salt tolerance; leaf gas exchange; recovery; wheat-barley addition. ---Received 25 January 2016, accepted 5 May 2016. + Corresponding author; e-mail: ds@ektf.hu Abbreviations: 7H add -wheat-barley 7H addition line; CEF -cyclic electron flow around PSI; Ci -intercellular CO2 concentration; F -steady-state fluorescence; F0, Fm -minimum and maximum Chl fluorescence determined in the dark-adapted state; Fm' -maximal fluorescence in the light-adapted state; Fv -variable fluorescence; Fv/Fm -maximum quantum yield of PSII photochemistry; gs -stomatal conductance; Lns -nonstomatal limitation; Ls -stomatal limitation; NPQ -nonphotochemical quenching; P0 -minimal P700 signal; Pm -maximal P700 level; Pm' -maximal P700 signal in a given light state; PN -net assimilation rate; PNmax -maximal assimilation rate; RuBP -ribulose-1,5-bisphosphate; RWC -relative water content; ε -carboxylation efficiency; ɸCEF -quantum yield of cyclic electron flow around PSI; ɸNA -quantum yield of the acceptor side limitation of PSI; ɸND -quantum yield o...

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“…In Arabidopsis thaliana mutants deficient in PG, thylakoid membranes do not develop into a granum structure (Hagio et al ). High concentrations of PG may allow for increased rates of electron transfer (Kim et al ) in shade‐adapted leaves and/or disaggregation of the LHCII (Schaller et al ), leading to increased energy transfer from PSII to PSI (Apostolova et al ). We have shown that shading increases foliar polar lipid concentration and the degree of unsaturation of thylakoid membranes, which appears to be a common response in shade‐tolerant plant species.…”

Section: Discussionmentioning

confidence: 99%

Does triacylglycerol (TAG) serve a photoprotective function in plant leaves? An examination of leaf lipids under shading and drought

Marchin

Turnbull

Deheinzelin

et al. 2017

Physiologia Plantarum

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Plant survival in many ecosystems requires tolerance of large radiation loads, unreliable water supply, and suboptimal soil fertility. We hypothesized that increased production of neutral lipids (triacylglycerols, TAGs) in plant leaves is a mechanism for dissipating excess radiation energy. In a greenhouse experiment, we combined drought and shade treatments and examined responses among four species differing in life form, habitat, and drought- and shade-tolerance. We also present a lipid extraction protocol suitable for sclerophyllous leaves of native Australian trees (e.g. Acacia, Eucalyptus). Fluorescence measurements indicated plants exposed to full sunlight experienced mild photoinhibition during our experiment. Accumulation of TAGs did not follow photosynthetic capacity, but instead, TAG concentration increased with non-photochemical quenching. This suggests plants under oxidative stress may increase biosynthesis of TAGs. Moderate drought stress resulted in a 60% reduction in TAG concentration in wheat (Triticum aestivum). Shading had no effect on TAGs, but increased concentrations of polar lipids in leaves; for example, acclimation to shade in Austrodanthonia spp., a native Australian grass, resulted in a 60% increase in associated polar lipids and higher foliar chlorophyll concentrations. Shading also reduced the digalactosyldiacylglycerol: monogalactosyldiacylglycerol (DGDG:MGDG) ratio in leaves, with a corresponding increase in the degree of unsaturation and thus fluidity of thylakoid membranes of chloroplasts. Our results suggest prevention of photodamage may be coordinated with accumulation of TAGs, although further research is required to determine if TAGs serve a photoprotective function in plant leaves.

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Relationship between the organization of the PSII supercomplex and the functions of the photosynthetic apparatus

Cited by 67 publications

References 51 publications

Damage and protection of the photosynthetic apparatus from UV-B radiation. II. Effect of quercetin at different pH

Damage and protection of the photosynthetic apparatus from UV-B radiation. II. Effect of quercetin at different pH

Photosynthetic responses of a wheat (Asakaze)-barley (Manas) 7H addition line to salt stress

Does triacylglycerol (TAG) serve a photoprotective function in plant leaves? An examination of leaf lipids under shading and drought

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