Reactive Oxygen Species and Photosynthesis

Hajiboland, Roghieh

doi:10.1016/b978-0-12-799963-0.00001-0

Cited by 54 publications

(49 citation statements)

References 224 publications

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“…Reduction of F v /F m revealed damage to photosystems (Hajiboland, 2014) and Se-induced recovery of this ratio implicated that Se may be effective in protection of photosynthetic apparatus from drought-induced damages via enhanced capacity of defense system (Yao et al, 2009;Habibi, 2013) or by increasing CO 2 availability for biochemical reactions i.e. higher stomatal conductance that reduces, in turn, generation of excess excitation energy (Hajiboland, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…However, closure of stomata in turn, results in reduction of CO 2 availability for photosynthetic carbon metabolism, depresses net CO 2 assimilation rate and inhibits plants ability for dry matter accumulation (Chaves et al, 2009). In addition, declines in the CO 2 availability to the Calvin cycle enzymes result in lower regeneration of NADP + and production of excess excitation energy that damages photosystems (Hajiboland, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Se application on photosynthesis, osmolytes and water relations in two durum wheat (Triticum durum L.) genotypes under drought stress

Hajiboland

Sadeghzadeh

Sadeghzadeh³

2015

AAS

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Effect of Se (as Na 2 SeO 4 at final concentration of 10 µg l -1 ) was studied in two durum wheat (Triticum durum L.) genotypes in perlite under drought conditions. Se treatment increased slightly biomass of both genotypes under drought but not under control conditions. Photosynthetic rate was depressed by drought while increased by Se treatments in both genotypes up to 2.3 fold. However, transpirational water loss was also enhanced in Se-treated plants under both wellwatered and drought conditions. Se application resulted in higher concentrations of soluble proteins and free α-amino acids under drought conditions, but not proline. Our results indicated that Se application improves some physiological parameters such as photosynthesis, accumulation of osmolyes and water use efficiency but did not change significantly plants biomass or water relation parameters. Preučevani so bili učinki Se, dodanega kot Na 2 SeO 4 v koncentraciji 10 µg l -1 na dveh genotipih trde pšenice (Triticum durum L.) gojene v perlitu v razmerah sušnega stresa. Tretiranje s Se je neznatno povečalo biomaso obeh genotipov v razmerah sušnega stresa, a ne pri kontroli. Fotosinteza je upadla s sušo, a se je po tretiranju s Se pri obeh genotipih povečala za 2.3 krat. Transpiracijska izguba vode je bila pospešena pri rastlinah tretiranih s Se v razmerah sušnega stresa kot pri dobro zalitih rastlinah. Uporaba Se se je odrazila v večji koncentraciji topnih beljakovin in prostih α-amino kislin v razmerah suše, vendar ne v koncentraciji prolina. Naši rezultati kažejo, da uporaba Se izboljša nekatere fiziološke parameter kot so fotosinteza, akumulacija osmotikov in učinkovitost izrabe vode, vendar ne spremeni značilno biomase rastlin in parametrov vodnega režima rastline.Ključne besede: organski osmotiki, fotosinteza, prolin, učinkovitost izrabe vode, vodni režim

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Se application on photosynthesis, osmolytes and water relations in two durum wheat (Triticum durum L.) genotypes under drought stress

Hajiboland

Sadeghzadeh

Sadeghzadeh³

2015

AAS

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“…In order to counter the damage caused by ROS, plants produce antioxidants such as ascorbate, glutathione, carotenoid and flavonoids, among others (Hajiboland 2014). It has been shown that the molecular structure and the hydroxyl groups in particular influence the radical-scavenging activity of flavonoids (Amić et al 2003).…”

Section: Effect Of Drought On Tea Qualitymentioning

confidence: 99%

“…heat dissipation, mediated by xanthophyll cycle pigments. Photoinhibition occurs when these photoprotection mechanisms cannot efficiently quench excess excitation energy, resulting in damage to photosystems (Hajiboland 2014). Because the tea plant originated as an understorey plant in tropical rainforests, its photosynthetic apparatus is adapted to function with maximum capacity under shade ).…”

Section: Photoinhibition and Shade Adaptation In Teamentioning

confidence: 99%

Environmental and nutritional requirements for tea cultivation

Hajiboland

2017

Folia Horticulturae

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Tea (Camellia sinensis) is an important beverage crop cultivated in the tropics and subtropics under acid soil conditions. Increased awareness of the health-promoting properties of the tea beverage has led to an increase in its level of consumption over the last decades. Tea production contributes significantly to the economy of several tea-cultivating countries in Asia and Africa. Environmental constrains, particularly water deficiency due to inadequate and/or poorly distributed rainfall, seriously limit tea production in the majority of tea-producing countries. It is also predicted that global climate change will have a considerable adverse impact on tea production in the near future. Application of fertilizers for higher production and increased quality and quantity of tea is a common agricultural practice, but due to its environmental consequences, such as groundwater pollution, the rate of fertilizer application needs to be reconsidered. Cultivation of tea under humid conditions renders it highly susceptible to pathogens and pest attacks. Application of pesticides and fungicides adversely affects the quality of tea and increases health risks of the tea beverage. Organic cultivation as an agricultural practice without using synthetic fertilizers and other chemical additives such as pesticides and fungicides is a sustainable and eco-friendly approach to producing healthy tea. A growing number of tea-producing countries are joining organic tea cultivation programmes in order to improve the quality and to maintain the health benefits of the tea produced.Ke y wor d s: aluminium, global climate change, nitrogen fertilizers, organic culture, phosphorus fertilizers, soil pH, water deficiency Abbreviations: C a -atmospheric CO 2 concentration, T a -atmospheric temperature, ESTs -estimated sequence tags, N sh -harvestable shoot density, W sh -harvestable shoot weight, C i -intracellular CO 2 concentration, T l -leaf temperature, P max -maximum photosynthetic rate, T m -maximum temperature, P n -net photosynthetic rate, T o -optimum temperature, PAR -photosynthetic active radiation, ROS -reactive oxygen species, SER -shoot extension rate, SRC -shoot replacement cycle, T s -soil temperature, SWD -soil water deficit, g s -stomatal conductance, SSH technique -suppression subtractive hybridization technique, T t -threshold temperature, TE -transpiration efficiency, VPD -vapour pressure deficit, WUE -water use efficiency

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“…A positive correlation between leaf N and protein content with leaf Chl content and its photosynthetic efficiency has been well documented (Hawkesford et al 2012). Car as the main biochemical component of non-photochemical quenching plays an important role in protecting photosystems against damages caused by excess excitation energy particularly under salt stress (Hajiboland 2014). It has been also shown that up-regulation of Chl b biosynthesis regulates the expression of several thylakoid membrane proteins that increase both the antenna size and the electron transport rates and enhance CO 2 assimilation, starch content and dry matter accumulation (Biswal et al 2012) and increases thermo-stability and function of PSII (Lin et al 2005).…”

Section: Discussionmentioning

confidence: 99%

Physiological responses of halophytic C<sub>4</sub> grass Aeluropus littoralis to salinity and arbuscular mycorrhizal fungi colonization

Hajiboland¹,

Dashtebani²,

Aliasgharzad³

2015

Photosynt.

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The halophytic C 4 grass, Aeluropus littoralis, was cultivated under low (50 mM) and high (200 mM) NaCl salinity and inoculated with the arbuscular mycorrhizal fungi (AMF) Claroideoglomus etunicatum in a sand culture medium for 20 weeks. Shoot and root dry mass increased under salinity conditions up to 24 and 86%, respectively. Although the root colonization rate significantly decreased in the presence of salt, +AMF plants had higher biomass compared with -AMF ones only under saline conditions. Net CO 2 assimilation rate increased significantly by both salinity levels despite stable stomatal opening. In contrast, AMF-mediated elevation of the net CO 2 assimilation rate was associated with higher stomatal conductance. Unexpectedly, leaf activity of phosphoenolpyruvate carboxylase decreased by salinity and AMF colonization. Transpiration rate was not affected by treatments resulting in higher water-use efficiency under salinity and AMF conditions. Concentrations of soluble sugars and free α-amino acids increased by both salinity and AMF treatments in the shoot but not in the roots. Proline concentration in the leaves was higher in the salt-treated plants but AMF colonization did not affect it significantly. Leaf activity of nitrate reductase increased by both salinity and AMF treatments. Mycorrhizal plants had significantly higher Na + and K + uptake, while Ca 2+ uptake was not affected by salt or AMF colonization. The ratio of K:Na increased by AMF in the shoot while it decreased in the roots. Leaf osmotic potential was lowered under salinity in both +AMF and -AMF plants. Our results indicated that higher dry matter production in the presence of salt and AMF could be attributed to higher CO 2 and nitrate assimilation rates in the leaves. Higher leaf accumulation of soluble sugars and α-amino acids but not proline and elevated water-use efficiency were associated with the improved growth of A. littoralis inoculated with AMF.Additional key words: compatible solutes; net CO2 assimilation rate; nitrate reductase; phosphoenolpyruvate carboxylase; water relations.

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Reactive Oxygen Species and Photosynthesis

Cited by 54 publications

References 224 publications

Effect of Se application on photosynthesis, osmolytes and water relations in two durum wheat (Triticum durum L.) genotypes under drought stress

Effect of Se application on photosynthesis, osmolytes and water relations in two durum wheat (Triticum durum L.) genotypes under drought stress

Environmental and nutritional requirements for tea cultivation

Physiological responses of halophytic C<sub>4</sub> grass Aeluropus littoralis to salinity and arbuscular mycorrhizal fungi colonization

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