Molecular Mechanisms of Stress Resistance of Photosynthetic Machinery

Kreslavski, Vladimir D.; Zorina, Anna; Los, Dmitry A.; Fomina, Irina R.; Allakhverdiev, Suleyman I.

doi:10.1007/978-81-322-0807-5_2

Cited by 22 publications

(12 citation statements)

References 235 publications

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“…Â-carotene and zeaxanthin as well as tocopherols have an important photo protector role, whether for dissipation of the excess of energy as heat or by ROS cleaning (Gill & Tujeta, 2010;Kreslavski et al, 2013). Carotenoids such as Neoxanthin and lutein were associated to the process of ROS removal Reduction was seen in the contents of H 2 O 2 cm -1 at 24 HAS when applying herbicides quinclorac, bentazon and carfentrazone-ethyl (Table 5).…”

Section: Resultsmentioning

confidence: 99%

“…Carotenoids are present in the non-enzymatic antioxidant compounds, and they are pigments responsible for the photo protection of the photosynthetic membranes, acting as auxiliary pigments. They also act in the dissipation of the excited state of chlorophyll and neutralization of ROS, once they are antioxidants with low molecular weight (Kreslavski et al, 2013). Among the amino acids, proline has a fundamental role in the response of plants to oxidative stress, which has been shown in experiments in which exogenous proline was applied (Ozden et al, 2009) or in which the synthesis or degradation of proline was genetically manipulated (Molinari et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Biochemical and Physiological Changes in Rice Plants Due to the Application of Herbicides1

et al. 2016

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-The application of herbicides, even if selective, can cause biochemical and physiological changes, resulting in oxidative stress. This stress comes from the accumulation of reactive oxygen species produced due to exposure to the herbicide. However, plants have developed defense strategies, which can be enzymatic or non-enzymatic. The objective of this study was to evaluate the morphological and metabolic changes such as photosynthetic parameters, oxidative damage and antioxidant enzyme activity of rice plants after applying herbicides. For this, a study was conducted in a greenhouse and laboratory and the treatments consisted of application of imazapic + imazapyr, quinclorac, bentazon, cyhalofop-butyl, penoxsulan, bispyribac-sodium and carfentrazone-ethyl, in addition to control without herbicide. The phytotoxicity in plants was strong and there was a reduction in photosynthesis, stomatal conductance and efficiency of water use in plants treated with carfentrazone-ethyl. Furthermore, the application of carfentrazone-ethyl resulted in lower chlorophylls and carotenoids and increased lipid peroxidation and proline accumulation. Changes in the activity of enzymes belonging to the antioxidant system were inspected by applying herbicides. The application of herbicide alters the physiology of rice plants, triggering responses to oxidative stress, which are more pronounced when used carfentrazone-ethyl. Keywords:Oryza sativa, oxidative stress, lipid peroxidation, selectivity. RESUMO -

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biochemical and Physiological Changes in Rice Plants Due to the Application of Herbicides1

et al. 2016

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“…Indeed, deep P. oceanica ecotypes, contrary to shallow ones, experienced a significant suppression of those genes encoding key elements of the electron transport chain (atpA) and of the carbon fixing processes (rbcL, RBCS and RCA) being at the same time unable to enhance their electron transport and photosynthetic rates. These early molecular alterations, which are considered clear symptoms of photosynthetic heat sensitivity in terrestrial plants 37 , can be regarded as molecular evidences of the greater sensitivity of deep P. oceanica to heat stress.…”

Section: Discussionmentioning

confidence: 99%

Physiological and molecular evidence of differential short-term heat tolerance in Mediterranean seagrasses

Marín-Guirao

Ruiz

Dattolo

et al. 2016

Sci Rep

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The increase in extreme heat events associated to global warming threatens seagrass ecosystems, likely by affecting key plant physiological processes such as photosynthesis and respiration. Understanding species’ ability to acclimate to warming is crucial to better predict their future trends. Here, we study tolerance to warming in two key Mediterranean seagrasses, Posidonia oceanica and Cymodocea nodosa. Stress responses of shallow and deep plants were followed during and after short-term heat exposure in mesocosms by coupling photo-physiological measures with analysis of expression of photosynthesis and stress-related genes. Contrasting tolerance and capacity to heat acclimation were shown by shallow and deep P. oceanica ecotypes. While shallow plants acclimated through respiratory homeostasis and activation of photo-protective mechanisms, deep ones experienced photosynthetic injury and impaired carbon balance. This suggests that P. oceanica ecotypes are thermally adapted to local conditions and that Mediterranean warming will likely diversely affect deep and shallow meadow stands. On the other hand, contrasting mechanisms of heat-acclimation were adopted by the two species. P. oceanica regulates photosynthesis and respiration at the level of control plants while C. nodosa balances both processes at enhanced rates. These acclimation discrepancies are discussed in relation to inherent attributes of the two species.

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“…Plants in general have a machinery of photosynthesis system that can experience the effects of many stresses at the same time and the response is more involving same mechanism by which protection and adaptation is achieved (Kreslavski et al 2013;Allakhverdiev et al 2008) A distinct K-step in the OJIP curve was seen in heat stressed plants which is attributed mainly to inhibition of the oxygen evolving complex in the PSII, this was not seen in the water deficit plants, which has been reported by Duarte et al (2015). K Step under heat stress is also reported by Rodriguez, et al (2015).…”

Section: Discussionmentioning

confidence: 99%

Integrated high-resolution phenotyping, chlorophyll fluorescence induction kinetics and photosystem II dynamics under water stress and heat in Wheat (Triticum aestivum)

Shanker

Coe

Sirault

2019

Preprint

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An experiment was conducted in controlled conditions in three varieties of wheat under water stress, heat and heat +water stress treatments with the objective of studying Chlorophyll a fluorescence, chlorophyll fluorescence induction kinetics and the function of Photosystem II by plant phenotyping as affected by stress. We hypothesised that during stress, specific adaptive strategies are employed by plants, such as structural and functional changes in PS II by which they acquire new homeostasis which may be protective adaptations. Water stress stress treatment was imposed on Water stress and Heat +Water stress treatments at 43 DAS.Heat treatment was imposed on 48 DAS. Maximum quantum yield of primary photochemistry was measured with PAM 2500 and OJIP was measured with FluorPen FP 100 after the onset of stress at four observation times on two days viz., pre-dawn and afternoon during stress. In addition continuous monitoring of photosynthetic efficiency was done with Monitoring PAM.Heat +Water stress stress was more detrimental as compared to Heat or Water stress alone in terms of maximum quantum yield of photochemistry. This could have been due to higher decrease in connectivity between PSII and its antennae resulting in lower photosynthetic efficiency resulting in the impairment and disruption of the electron transport. K step was observed in heat stress and heat +Water stress stress which may be because of damage to Oxygen Evolving Complex indicating that low thermostability of the complex. The stress treatments had a reduction in the plastoquinone pool size as indicated by the reduced area above the OJIP curve. Our study indicated that the instrument PAM 2500 sensed both stresses separately and combined earlier than the other instruments, so in terms of sensitivity PAM 2500 was more effective than FluorPen FP 100 and MultispeQ. Rapid screening of stress was more effectively with FluorPen FP 100 and MultispeQ than by PAM 2500.

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Molecular Mechanisms of Stress Resistance of Photosynthetic Machinery

Cited by 22 publications

References 235 publications

Biochemical and Physiological Changes in Rice Plants Due to the Application of Herbicides1

Biochemical and Physiological Changes in Rice Plants Due to the Application of Herbicides1

Physiological and molecular evidence of differential short-term heat tolerance in Mediterranean seagrasses

Integrated high-resolution phenotyping, chlorophyll fluorescence induction kinetics and photosystem II dynamics under water stress and heat in Wheat (Triticum aestivum)

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