The effect of soil drought on the content of photosynthetic pigments in barley plants of the Brovar variety

A significant effect of soil drought on the morphometric parameters of the leaves of barley plants of the Brovar variety, as well as the content of photosynthetic pigments (chlorophyll, carotenoids) in them was established. However, a significant decrease in plant growth indicators under drought conditions, a decrease in the amount of chlorophyll and, to a greater extent, carotenoids occurred against the background of the absence of a change in the content of pheophytin. We assume that the decrease in the number of pigments is mainly associated not with destruction due to stress, but with a decrease in their synthesis, which can be an adaptive reaction of plants, which minimizes the likelihood of formation of reactive oxygen species in photosynthetic membranes under conditions of drought, and also optimizes the use of light energy for photosynthetic processes under such conditions, as indicated by the predominant decrease in carotenoids such as neoxanthin, violaxanthin and β-carotene, which are actively involved in light harvesting and energy transfer to reaction centers.

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Induction of wheat seedlings resistance of different ecotypes to the effect of a drought simulated by a colloidal solution of Cu2+ and Zn2+ nanoparticles

Bulletin of Taras Shevchenko National University of Kyiv Series Biology ◽

10.17721/1728_2748.2018.76.79-84 ◽

2018 ◽

Vol 76 (2) ◽

pp. 79-84

Author(s):

V. Storozhenko ◽

N. Svietlova ◽

M. Kovalenko ◽

L. Batsmanova ◽

N. Taran

Keyword(s):

Water Content ◽

Leaf Area ◽

Photosynthetic Pigments ◽

Colloidal Solution ◽

Morphometric Parameters ◽

Sand Culture ◽

Colloid Solution ◽

Forest Steppe ◽

Drought Conditions ◽

Simulated Drought

The aim of the investigation was to study the effect of colloidal solution of Cu2+ and Zn2+ nanoparticles on the pro/antioxidant balance, the content of photosynthetic pigments (chlorophylls a, b and carotenoids), the chlorophyll a/b ratio and the morphometric parameters (relative leaf water content, leaf area) of winter wheat Triticum aestivum L. varieties Acveduc (steppe ecotype, resistant to drought) and Stolichna (forest-steppe ecotype, sensitive to drought) under conditions of simulated drought. The drought was created by stopping of watering on the 8th day after emergence and maintaining the soil moisture at 30 % of the total moisture capacity for 3 days. Pre-sowing treatment of seeds with Cu2+ and Zn2+ nanoparticles was carried out by soaking of seeds in experimental solution (1 part of the mother colloid solution: 100 parts of water) for 4 hours. The control variant was soaked in distilled water. Then the seeds were washed and planted in a sand culture. The varietal specificity of the influence of a colloidal solution of metal nanoparticles on seedlings of the Acveduc and Stolichna varieties was revealed. Presowing treatment of seeds with Cu2+ and Zn2+ nanoparticles led to significant changes in the pro/antioxidant balance in leaves of seedlings, reducing the level of accumulation of TBARS, increasing the activity of key antioxidant enzymes (superoxide dismutase and catalase), stabilizing the content of photosynthetic pigments, increasing the relative water content in leaves and leaf area under simulated drought conditions. In general, under drought conditions, presowing of seed treatment with a colloidal solution of nanoparticles had a positive effect on the proantioxidant balance of plants and the morphometric parameters of leaves to a greater extent in seedlings of the steppe ecotype variety (Acveduc) and less in seedlings of the forest-steppe ecotype variety (Stolichna).

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Ingenious control of adsorbed oxygen species to construct dual reaction centers ZnO@FePc photo-Fenton catalyst with high-speed electron transmission channel for PPCPs degradation

Applied Catalysis B Environmental ◽

10.1016/j.apcatb.2021.120064 ◽

2021 ◽

Vol 291 ◽

pp. 120064

Author(s):

Hengli Qian ◽

Guanjie Yu ◽

Qidong Hou ◽

Yifan Nie ◽

Chuanyunlong Bai ◽

...

Keyword(s):

High Speed ◽

Reaction Centers ◽

Adsorbed Oxygen ◽

Oxygen Species ◽

Transmission Channel ◽

Electron Transmission ◽

Adsorbed Oxygen Species ◽

Fenton Catalyst

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Cromoglycate and nedocromil enhanced the reactive oxygen species-dependent suppressions with, but not without, dexamethasone in ischaemic and histamine paw oedema of mice

Mediators of Inflammation ◽

10.1080/09629359791514 ◽

1997 ◽

Vol 6 (5-6) ◽

pp. 369-374

Author(s):

Y. Oyanagui

Keyword(s):

Reactive Oxygen Species ◽

Hydrogen Peroxide ◽

Superoxide Dismutase ◽

Glucocorticoid Receptor ◽

Low Dose ◽

Natural Antioxidant ◽

Target Cells ◽

Oxygen Species ◽

Paw Oedema ◽

Β Carotene

Anti-inflammatory actions of two anti-allergic drugs, alone or with dexamethasone (Dex) were examined in two models, because inflammation is claimed to be important for allergic events, especially for asthma. Cromoglycate and nedocromil were tested in ischaemic- and histamineinduced paw oedema models of mice. These antiallergic drugs (1–100 mg/kg, i.p.) failed to suppress these oedemata, but enhanced the suppressions by a low dose of dexamethasone (0.1 mg/kg, s.c.) at 3–8 h after Dex injection. The mode of effects by anti-allergic drugs resembled that of a natural antioxidant (α-tocopherol, β-carotene etc.), and was different from that of an immunosuppressant like FK506. The enhancing potencies of the two anti-allergic drugs were similar at 6 h after Dex in both oedemata, and were diminished by superoxide dismutase (SOD) or catalase (i.p.). Cycloheximide completely abolished suppressions. Nedocromil, but not cromoglycate, inhibits inflammatory events. Therefore, there are common unknown actions by which the two anti-allergics enhance suppression by Dex. A possible mechanism of this action was supposed to enhance the superoxide and/or hydrogen peroxide-dependent glucocorticoid receptor (GR) signalling in the target cells.

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Dust Pollution Reduced Stomatal Conductance and Photosynthetic Pigments of Selected Medicinal Plants Growing at Lokpa Ukwu Quarry Site in Abia State, Nigeria

Annual Research & Review in Biology ◽

10.9734/arrb/2019/v34i630173 ◽

2020 ◽

pp. 1-11

Author(s):

C. E. Ogbonna ◽

F. I. Nwafor ◽

N. O. Nweze

Keyword(s):

Stomatal Conductance ◽

Medicinal Plants ◽

Photosynthetic Pigments ◽

Total Chlorophyll ◽

Negative Effects ◽

Dust Pollution ◽

Standard Procedures ◽

Maximum Conductance ◽

Clearing Method ◽

Β Carotene

Aims: We investigated the influence of dust pollution on stomatal conductance and photosynthetic pigments in some medicinal plants growing at Lokpa Ukwu quarry site, Abia State, Nigeria. Place and Duration of Study: Samples were collected from Lokpa Ukwu, Abia State while laboratory analyses were carried out in the Department of Pharmacognosy and Environmental Medicines, University of Nigeria, Nsukka between February and April, 2019. Methodology: A total of nine (9) plants were sampled for the study. Leaf epidermises were prepared by clearing method and stomata were observed and studied quantitatively. Stomatal conductance was estimated from the anatomical variables following standard procedures. Total chlorophyll and β-carotene contents were also analysed and compared with control groups. Results: We observed some physiological changes in the plants from dust-polluted site such as stretched epidermal cells, deformed stomata and plasmolysed guard cells. It reduced the potential conductance indices (PCI) of the plants by 87.4% in Aspilia africana and 67% in Chromolaena odorata. The least reduction in PCI was observed in Celosia trigyna (7.2%). Operating conductance (gop) and maximum conductance (gmax) were reduced by 69.2% and 72.3% in C. odorata and A. africana respectively. Celosia trigyna was least affected with percentage reductions of 18.3% and 1.4% for gop and gmax respectively. Reduction in PCI and gmax followed the order: C. trigyna ˂ C. papaya ˂ P. discoideus ˂ D. oliveri ˂ T. rhomboidea ˂ T. orientalis ˂ V. doniana ˂ C. odorata ˂ A. africana. Total chlorophyll and β-carotene contents were reduced the most in V. doniana (45.73%) and C. odorata (40.31%) respectively and least reduced in T. orientalis by 19.54% and 13.24% respectively. Conclusion: Our findings validate previous reports of negative effects of dust pollution from quarry industries on both humans and plants alike.

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Interactions between Photosynthetic Pigments Bound to Lipid and Protein Particles. Spectroscopic Properties

Zeitschrift für Naturforschung C ◽

10.1515/znc-1979-7-816 ◽

1979 ◽

Vol 34 (7-8) ◽

pp. 582-587

Author(s):

Framçoise Techy ◽

Monique Dinant ◽

Jacques Aghion

Keyword(s):

Chlorophyll A ◽

Photosynthetic Pigments ◽

Relative Concentration ◽

Spectroscopic Properties ◽

Chlorophyll B ◽

Pheophytin A ◽

Chlorophylls A And B ◽

Protein Particles ◽

Β Carotene

Abstract The spectroscopic (visible) properties of pigment-bearing lipid and protein particles extract ed from milk show that: 1) chlorophylls a and b bound to separate particles can form aggregates provided their relative concentration is high enough. Neither pheophytin a nor β-carotene, in the same conditions, form observable aggregates. 2) Chlorophylls a and b can co-aggregate when they are bound to the same particles. Pheophytin a as well as β-carotene seem to prevent the aggregation of chlorophyll a. β-carotene has no effect on the aggregation of chlorophyll b.

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Variation in water potential components among half-sib families of shortleaf pine (Pinusechinata) in response to soil drought

Canadian Journal of Forest Research ◽

10.1139/x92-015 ◽

1992 ◽

Vol 22 (1) ◽

pp. 111-116 ◽

Cited By ~ 5

Author(s):

H.S. Choi

Keyword(s):

Drought Stress ◽

Water Potential ◽

Drought Resistance ◽

Water Volume ◽

Soil Drought ◽

Shortleaf Pine ◽

Turgor Loss Point ◽

Drought Conditions ◽

Sib Families ◽

Elastic Modules

To assess family differences in response to drought, various water potential components of seedlings from six half-sib families of shortleaf pine (Pinusechinata Mill.) were compared under control (well-watered) and drought conditions. Drought stress resulted in significant changes in water relations parameters of the seedlings between treatments and among families. Although both Montgomery (103) and Pope (322) families had a superior capacity to adjust osmotically to both treatments, Montgomery (103) family exhibited greater potential to adapt to droughty environments through having the lowest values of osmotic potential both at maximum turgor and at the turgor loss point and having the highest values of (i) mean volume of osmostic water at the turgor loss point per volume of symplasmic water, (ii) symplasmic water volume per total shoot water volume, (iii) maximum bulk elastic modules, and (iv) turgor potential. Families Polk (115) and Scott (202) showed intermediate responses to drought. Both Scott (219) and Yell (342) families showed the lowest ability for osmotic adjustment to both treatments, but Yell (342) family revealed even lower drought resistance responses. Results from this study may provide the means of screening families that have high drought resistance potential during the field establishment period.

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