scholarly journals EFECTO DE LA FUENTE DE LUZ SOBRE LA MICROPROPAGACIÓN DE PLANTAS DEORÉGANO MEXICANO(Lippia graveolens)

e-CUCBA ◽  
2021 ◽  
Vol 15 (8) ◽  
pp. 44-52
Author(s):  
Sánchez-Velázquez Emmanuel ◽  
◽  
Rodríguez-Sahagún AracelI ◽  
Acevedo-Hernández Gustavo J ◽  
Rayn C Aarland ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Photosynthetic Pigments ◽  
Broad Spectrum ◽  
Energy Demand ◽  
The Other ◽  
Light Sources ◽  
Similar Response ◽  
Led Light ◽  
Fluorescent Lamps ◽  
Chlorophyll A And B

The use of different light sources in the micropropagation of plant species has been studied since the 1970s. At present, studies are being carried out not only to increase production, but to greatly reduce the energy demand of the lamps that are used for this purpose. In the present work, light sources with different wavelengths in fluorescent lamps and LED light were used to test the morphological and phytochemical response of Mexican origanumplants. A similar response was obtained regarding the production of axillary buds and leaves with the use of broad spectrum light and LED light. On the other hand, the main photosynthetic pigments (chlorophyll a and b and carotenoids) are also produced in a similar way when this plant is propagated under broad spectrum light and LED light.

scholarly journals Variations of Chlorophyll Content at Abies alba and Nepeta pannonica Species According to Phenophase and Harvesting Area

2019 ◽  
Vol 52 (1) ◽  
pp. 74-78
Author(s):  
S. Buhăianu ◽  
Doina Carmen Jităreanu
Keyword(s):  
Chlorophyll Content ◽  
Chlorophyll A ◽  
Photosynthetic Pigments ◽  
Photosynthetic Activity ◽  
Abies Alba ◽  
Chlorophyll B ◽  
Green Color ◽  
Yellow Coloration ◽  
Chlorophyll A And B ◽  
Chlorophyll A Content

Abstract Chlorophylls from plants are photosynthetic pigments. Their quantity offers valuable informations about photosynthetic activity, growing and developing of plants. Photosynthetic pigments decrease quantitatively during senescence process or in stress conditions. The present study has been realized in laboratory conditions with material harvested from spontaneous flora. The purpose of this research was the investigation of variations of chlorophyll content from samples of biological material collected from Nepeta pannonica L. and Abies alba Mill. plants, from Câmpulung Moldovenesc and Cacica areas, Suceava county, Romania. The targeted phenophases were growth and flowering. There were realized acetonic extracts from samples for spectrophotometric determinations. Obtained data were processed to estabilish chlorophyll a and b content. There were observed that at Abies alba species, from both locations, the chlorophyll a content grew during flowering phenophase, while the chlorophyll b content had little variations. At Nepeta pannonica species, the chlorophyll a and b content decreased visibly during the flowering, due to stress. Leaves of plants from this species presented a intense green color in the growing phenophase, while during flowering phenophase they had a purple or yellow coloration. Obtained results revealed a different dynamics of chlorophyll content at studied species.

scholarly journals INFLUENCE OF PRE-SOWING TREATMENT OF SEEDS WITH COMPOSITIONS OF METABOLICALLY ACTIVE SUBSTANCES ON THE CONTENT OF PHOTOSYNTHETIC PIGMENTS IN THE LEAVES OF WINTER RYE PLANTS OF SYNTHETIC 38 AND ZABAVA VARIETIES AT DIFFERENT STAGES OF ONTOGENESIS

2021 ◽  
Vol 4 (11(75)) ◽  
pp. 11-16
Author(s):  
А. Kurylenko ◽  
O. Kurylenko ◽  
О. Kuchmenko ◽  
V. Havii
Keyword(s):  
Vitamin E ◽  
Chlorophyll A ◽  
Photosynthetic Pigments ◽  
Total Content ◽  
Winter Rye ◽  
Plant Leaves ◽  
Active Compounds ◽  
Chlorophyll A And B ◽  
Ubiquinone 10 ◽  
Active Substances

Purpose. The aim of the study is to investigate the effect of pre-sowing treatment of winter rye seeds of Synthetic 38 and Zabava with compositions of metabolically active substances on the content of photosynthetic pigments in plant leaves at different phases of ontogenesis. Materials and methods. The research materials were winter rye varieties Synthetic 38 and Zabava, and combinations of metabolically active substances: vitamin E (10-8M), paraoxybenzoic acid (0,001%), methionine (0,001%), ubiquinone-10 (10-8M) and MgSO4 (0,001%). The research scheme provided 4 options: 1) control (untreated seeds); 2) seeds, treated with a composition of substances: vitamin E + paraoxybenzoic acid + methionine + MgSO4; 3) seeds treated with a composition of substances: vitamin E + paraoxybenzoic acid + methionine; 4) seeds, processing by composition of substances: vitamin E + ubiquinone-10. Studies were conducted in the following phases of rye development: tillering, tubing, earing, flowering. The content of pigments - chlorophyll a, b and the total content of chlorophyll in the leaves of rye plants was determined by spectrophotometric method. Results and conclusions. It was demonstrated for the first time that the use of compositions of metabolically active compounds for pre-sowing treatment of winter rye varieties Synthetic 38 and Zabava leads to an increase of main chlorophyll, chlorophyll a and b in plant leaves in the dynamics from tillering to flowering. The composition consisting of vitamin E, para-oxybenzoic acid, methionine and MgSO4 showed the greatest efficiency. The effectiveness of this composition may be due to the complex action of all metabolically active compounds that are part of it. The obtained results may indicate a potentially more efficient absorption and conversion of energy by plants and the positive effect of these compositions on the photosynthesis of winter rye plants. Substances that have shown their effectiveness can be used as components of stimulants.

Impact of LED light sources on morphogenesis and levels of photosynthetic pigments in Gerbera jamesonii grown in vitro

2018 ◽  
Vol 59 (1) ◽  
pp. 115-123 ◽  
Author(s):  
Bożena Pawłowska ◽  
Marek Żupnik ◽  
Bożena Szewczyk-Taranek ◽  
Monika Cioć
Keyword(s):  
Photosynthetic Pigments ◽  
Light Sources ◽  
Gerbera Jamesonii ◽  
Led Light

scholarly journals Response of Tomato Plants (Solanum lycopersicum) to Stress Induced by Sb(III)

2016 ◽  
Vol 24 (1) ◽  
pp. 42-47 ◽  
Author(s):  
Matúš Peško ◽  
Marianna Molnárová ◽  
Agáta Fargašová
Keyword(s):  
Protein Content ◽  
Solanum Lycopersicum ◽  
Chlorophyll A ◽  
Translocation Factor ◽  
Dry Weight ◽  
The Other ◽  
Total Carotenoids ◽  
Tomato Plants ◽  
Chlorophyll A And B ◽  
High Concentrations

AbstractPresented study evaluates effects of various Sb(III) concentrations on tomato plants (Solanum lycopersicum) cultivated hydroponically. Visual symptoms of antimony toxicity were observed only at two highest applied concentrations (50 and 100 mg/L). Dry weight of aboveground parts decreased significantly in variants treated with 25, 50 and 100 mg/L Sb(III), by ~12, 35 and 65 %, respectively, in comparison to the control. Statistically significant decrease of chlorophyll a and b was observed only after application of two highest studied concentrations 50 and 100 mg/L Sb(III). On the other hand concentration of total carotenoids in leaves rose with increasing external Sb(III) concentration. High concentrations (50 and 100 mg/L) of Sb(III) in nutrient solution caused that protein content in leaves dropped by ~20 and 39% relative to control. Accumulation of antimony in roots was about 5- (10 mg/L) to 27-times (25 mg/L) greater than that in shoots. The highest BAF factor value determined for shoots was ~55 at 10 mg/L Sb(III) and for roots it was ~821 at 50 mg/L Sb(III). Translocation factor values were in whole studied concentration range 5 – 100 mg/L Sb(III) < 1. The most effective translocation of antimony from roots to shoots was observes for variants treated with 10 mg/L of Sb(III).

scholarly journals PENGGUNAAN LIGHT EMITTING DIODE PADA LAMPU CELUP BAGAN (The Use of Light Emitting Diode on Sunked Lamps of Lift Net)

2016 ◽  
Vol 4 (2) ◽  
pp. 141
Author(s):  
Imanuel M. Thenu ◽  
Gondo Puspito ◽  
Sulaeman Martasuganda
Keyword(s):  
Key Words ◽  
Lower Cost ◽  
Light Emitting Diode ◽  
The Other ◽  
Fluorescent Lamp ◽  
Light Emitting ◽  
Led Light ◽  
Fluorescent Lamps ◽  
Energy Save

<p>ABSTRACT<br />Lift net fishermen usually use fluorescent lamp as attractor to lure fish. As price of fuel rise, fishermen are forced to find another option to change their attractor into some much lower cost and more energy-save lamp, or in other words, to change into LED lamp. This research are providing evidence that sunked LED lamps can be utilized as a helper tools, and also determined the best time for catching fish in the lift net. Two lift net used in this research, one of them used sunked LED lamps and the other used ordinary fluorescent lamps. Lift net are operated as long as 20 nights, with four catching times per night, between 18.00-21.00, 21.00-00.00, 00.00-03.00, and 03.00-06.00. Results showed that LED lamps give a better result with 11 organisms successfully catch (287,6 kg), compared to ordinary fluorescent lamps with only six organisms (238,3 kg). The best time for catching with LED lamps are between 18.00-21.00 (121 kg), while between 21.00-00.00 (67,4 kg), 00.00-03.00 (46,9 kg) and 03.00-06.00 (52,3 kg).<br />Key words: fluorescent lamp, lift net, light emitting diode, Palabuhanratu,sunked lights</p><p>-------</p><p><br />ABSTRAK<br />Nelayan bagan biasa menggunakan lampu fluorescent sebagai atraktor untuk memanggil ikan. Harga bahan bakar yang mahal menyebabkan nelayan harus beralih memakai jenis lampu lain yang hemat energi, seperti lampu LED (light emitting diode) Penelitian bertujuan untuk membuktikan bahwa lampu celup LED dapat digunakan sebagai alat bantu penangkapan ikan pada bagan dan menentukan waktu operasi penangkapan terbaik. Dua bagan digunakan dalam penelitian ini. Masing-masing menggunakan lampu celup LED dan lampu fluorescent. Bagan dioperasikan selama 20 malam. Dalam 1 malam dilakukan 4 kali penangkapan, yaitu antara jam 18.00-21.00, 21.00-00.00, 00.00-03.00 dan 03.00-06.00. Hasil penelitian menunjukkan bahwa penggunaan lampu celup LED pada bagan menghasilkan 11 jenis organisma tangkapan seberat 287,6 kg, atau lebih banyak dari lampu fluorescent sejumlah 6 organisma (238,3 kg). Adapun waktu penangkapan terbaik pada bagan yang menggunakan lampu LED adalah antara pukul 18.00-21.00 yang menghasilkan tangkapan seberat 121 kg, sedangkan 21.00-00.00 (67,4 kg), 00.00-03.00 (46,9 kg) dan 03.00-06.00 (52,3 kg).<br />Kata kunci: lampu fluorescent, bagan, light emitting diode, Palabuhanratu, lampu celup</p>

scholarly journals The light color quality of LED operating at winter temperatures

2019 ◽  
Vol 11 (4) ◽  
pp. 112 ◽  
Author(s):  
Przemysław Tabaka ◽  
Pawel Rozga
Keyword(s):  
Solid State ◽  
Operating Temperature ◽  
Solid State Lighting ◽  
Light Sources ◽  
Led Light ◽  
Fluorescent Lamps ◽  
Color Rendering ◽  
Incandescent Lamps ◽  
Colour Rendering

The paper presents the results of calculations of colorimetric parameters of LED sources operating at a temperature range from -25oC to 25oC. The chromaticity coordinates and color rendition quality parameters were calculated on the basis of registered spectral distributions of radiation. For individual LED chromaticity shift is illustrated at CIE 1931 x,y diagram with 3 step and 7 step MacAdam ellipses. Full Text: PDF ReferencesJ. P. Freyssinier, D. Frering, J. Taylor, N. Narendran, and P. Rizzo, Reducing lighting energy use in retail display windows. Sixth International Conference on Solid State Lighting, Proceedings of SPIE 6337, 63371L (2006). CrossRef Aman, M. M., et al., 2013. Analysis of the performance of domestic lighting lamps, Energy Policy, CrossRef E. Elijošiute, J. Balciukevičiute, G. Denafas, Life cycle assessment of; compact fluorescent and incandescent lamps: Comparative analysis. Environ Res. Eng. Manag. 61 (3), pp. 65-72, (2012), CrossRef D. Czyzewski, LED substitutes of conventional incandescent lamps Przeglad Elektrotechniczny R. 88, No. 11 (2012), CrossRef P. Tabaka, P. Rozga, Assessment of methods of marking LED sources with the power of equivalent light bulb, ulletin of the Polish Academy of Sciences. Technical Sciences, Vol. 65, No. 6, (2017) CrossRef I. Fryc, P. Jakubowski, K. Kołacz, Analysis of optical radiation parameters of compact discharge HID lamps and LED COB modules used for illuminating shop windows, Przeglad Elektrotechniczny,R. 93, No 11, (2017); pp. 186-189, CrossRef T. Kawabata, Y. Ohno; Optical measurements of OLED panels for lighting applications, pp 1176-1186 Jun 2013, Journal of Modern Optics, Vol. 60, 2013 Issue 14 CrossRef W. Żagan, Conditions necessary to replacing the conventional lamps by energy-saving lamps, Przeglad Elektrotechniczny R. 85, No. 5, pp. 100-104, (2009). DirectLink P. Tabaka; Influence of Ambient Temperature on Colour Properties of Low-Pressure Fluorescent Lamps, Light & Engineering, Vol. 23; No. 2; (2015). DirectLink W. R. Ryckaert, et al., Linear LED tubes versus fluorescent lamps: An evaluation. Energy Build. 49, pp. 429-436. CrossRef M. Zalesinska, J. Zablocka, K. Wandachowicz, Evaluation of Selected Parameters of Non-Directional Household Lamps, Conference: 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4), CrossRef I. Fryc; Measurement techniques of optical LEDs properties performed with compliance conformity with CIE 127:2007 standard, Przeglad Elektrotechniczny R. 85, No. 11, pp. 317-319, (2009) DirectLink IESNA, IES Approved Method: Measuring Lumen Maintenance of LED Light Sources. IES LM-80-08', IES Subcommittee on Solid-State Lighting of the IES Testing Procedures Committee (2018). DirectLink D. B. Judd, Estimation of chromaticity differences and nearest color temperature on the standard 1931 ICI colorimetric coordinate system. J. Opt. Soc. America 26 (11), 421, (1936) CrossRef CIE 177:2007 Colour Rendering of White LED Light Sources DirectLink CIE 13.3-1995 Method of Measuring and Specifying Colour. DirectLink CIE 224:2017 Colour Fidelity Index for accurate scientific use DirectLink CIE 15:2004 Colorimetry. DirectLink D. Mozysrska, M. Wyrwas, I. Fryc, The determination of the LEDs colorimetric parameters, in the range of their operating temperature, Przeglad Elektrotechniczny, R. 93, No. 4a, pp. 232-234, (2012). DirectLink J. Kowalska, Analysis of parameters describing the quality of the color rendering of light sources according to the IES TM-30-15 and the CIE 013.3-1995, Przeglad Elektrotechniczny, R. 93, No. 6; pp. 50-54, (2017) CrossRef J. Kowalska, I. Fryc, Colour rendition quality of typical fluorescent lamps determined by CIE Colour Fidelity Index and Colour Rendering Index, Przeglad Elektrotechniczny, R. 95, No. 7; (2019), pp. 94-97 CrossRef J. Kowalska, Ambiguity and limitations in determining the quality of the color rendering of light sources by index Ra (CIE CRI), Przeglad Elektrotechniczny, R. 93 No. 5, pp. 74-78, (2017) CrossRef I. Fryc, J. Fryc, A. Wasowski, Considerations about determining color rendering of light sources, Przeglad Elektrotechniczny, R. 92 No. 2, pp. 218-223, (2016) CrossRef I. Fryc, LED's spectral power distribution under different condition of operating temperature and driving current, Przeglad Elektrotechniczny, R. 86, No. 10, pp. 187-189, (2010). DirectLink A. David, P. Fini, K. Houser et al., Development of the IES method for evaluating the color rendition of light sources, Optics Express; Vol. 23; Issue 12, pp. 15888-15906, (2015). CrossRef K. Houser, M. Mossman, K. Smet et al, Tutorial, Color Rendering and Its Applications in Lighting, LEUKOS; Vol. 12, Issue 1-2; pp. 7-26; (2016). CrossRef

scholarly journals EFFECT OF FOLIAR FERTILIZATION AND SOME GROWTH REGULATORS ON THE CHEMICAL COMPOSITION AND THE PHOTOSYNTHETIC PIGMENTS OF CROTON PLANT LEAVES

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1101e-1101
Author(s):  
Mahmoud R. Shedeed ◽  
Khairy M. El-Gamassy ◽  
Alaa M. Almulla
Keyword(s):  
Chemical Composition ◽  
Chlorophyll A ◽  
Growth Regulators ◽  
Photosynthetic Pigments ◽  
Potassium Content ◽  
Plant Leaves ◽  
Foliar Fertilization ◽  
Chlorophyll A And B ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

The experiment was designed to investigate the effect of Fulifertil at levels 0,2 and 4 gm/L and growth regulators GA3 at 0,100,200 and 300 ppm also kinetin at 0,25,50 and 75 ppm and their combination on croton plants. In general the results indicate that there were increases in the carbohydrates, nitrogen, phosphorus and potassium content. The anthocyanins and carotenoids pigments were increased while chlorophyll `a” and “b” pigments were decreased. These findings are required to give colorful leaves which give good display.

scholarly journals Comparative Growth, Photosynthetic Pigments, and Osmolytes Analysis of Hemp (Cannabis sativa L.) Seedlings under an Aeroponics System with Different LED Light Sources

Horticulturae ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 239
Author(s):  
Md. Jahirul Islam ◽  
Byeong Ryeol Ryu ◽  
Md. Obyedul Kalam Azad ◽  
Md. Hafizur Rahman ◽  
Md. Soyel Rana ◽  
...  
Keyword(s):  
Photosynthetic Pigments ◽  
Cannabis Sativa ◽  
Leaf Length ◽  
Future Research ◽  
Soluble Carbohydrate ◽  
Natural Light ◽  
Light Sources ◽  
Node Number ◽  
Led Light ◽  
Baseline Information

The performance of hemp seedlings was evaluated through morphological traits, photosynthetic pigments, and osmolytes under 11 light treatments (10 LED light compositions + natural light) in an aeroponics system. The seedlings were brought under treatment at 25 days of age, where the light intensity was 300 µmol m−2s−1 and duration was 20 days. A higher leaf number and node number were observed in L10 (R4:B2:W2:FR1:UV1) and L11 (R2:B2:G2:W2:FR1:UV1), and a higher leaf length and leaf width were recorded in the L2 (white), L3 (R8:B2), and L5 (R7:B2:FR1) treatments. Furthermore, a higher shoot length was recorded in L3 (R8:B2), L6 (R6:B2:G1:FR1), and L9 (R6:B2:FR1:UV1) while roots developed more in the L1 (natural light), L5 (R7:B2:FR1), and L9 (R6:B2:FR1:UV1) treatments. On the other hand, the L3 (R8:B2) treatment manifested higher chlorophyll a, chlorophyll b, and photosynthetic quantum yield (Fv/Fm). The hierarchical clustering and heatmap analysis revealed that higher leaf numbers and node numbers resulted in bushy plants with shorter shoots and longer roots. A negative correlation was also observed in photosynthetic traits (pigments and fluorescence) with osmolytes and root length. Importantly, the treatments L4 (R7:B2:G1), L6 (R6:B2:G1:FR1), L8 (R5:B2:G1:FR1:UV1), and L11 (R2:B2:G2:W2:FR1:UV1) manifested higher nodes with a higher osmolyte content, such as proline, ascorbic acid, total soluble carbohydrate, and sucrose, which may be a helpful indicator for higher branches and inflorescences, and ultimately higher cannabinoids accumulation in the plants. The approach and findings of this study could provide future research with the baseline information on optimizing the light composition to produce hemp plants with ideal phenotypes.

scholarly journals Productivity of triticale depending on the content of photosynthesizing pigments at anthesis

2021 ◽  
Vol 12 (2) ◽  
pp. 15-22
Author(s):  
B.O. Mazurenko ◽  
Keyword(s):  
Chlorophyll Content ◽  
Chlorophyll A ◽  
Photosynthetic Pigments ◽  
Dry Matter ◽  
Nitrogen Fertilizers ◽  
Chlorophyll B ◽  
Varietal Response ◽  
Chlorophyll A And B ◽  
Fertilizer System

Photosynthetic pigments play an important role in the accumulation of dry matter and they can be the markers of stress. Change in the ratio of chlorophyll A and B indicates physiological changes and adaptation of the organism to changes of environmental conditions. Sowing terms and application of nitrogen fertilizers are long-term factors, so the content of chlorophylls in the flag leaf indicates long-term adaptation of the photosynthetic system. Establishing a relationship between the chlorophyll content at anthesis and the accumulation of dry matter in posy-anthesis period indicates the varietal response of triticale to fertilization and sowing dates. It was conducted a three-factor field experiment. There are studied two winter and one facultative triticale cultivar, two autumn sowing terms and fertilization system with application the different rates of nitrogen fertilizers in different growth stages. It was found that the content of photosynthetic pigments in each variety varied depending on sowing term and fertilizer system in terms of mg per 1 g of dry matter for chlorophyll A, B and the amount of A+B. At the same time, the difference between the factors and their interactions was insignificant for the total chlorophyll mass per unit area (g/m2) for chlorophyll A and the amount of A+B, but it was significant for chlorophyll B by the fertilizer system factor. This indicates that the main stress signal is chlorophyll B, so the ratio of chlorophyll A and B differed significantly depending on this factor. Cla: Clb ratio in the optimal sowing period is 5.3–8.1 in cv. Pidzimok kharkivskiy, 4.8–8.3 in cv. Amur and 5.0–6.7 in cv. Obriy mironivskiy. All cultivars have a strong positive correlation between the chlorophyll content at anthesis and accumulation of dry matter at post-anthesis perion under optimal conditions, but facultative triticale Pidzimok kharkivskiy has a negative correlation with unfavorable, due to increased chlorophyll, without increasing dry matter accumulation. Further study of the relationship between chlorophyll content and the synthesis of primary and secondary metabolites is promising in the study of varietal response to stress and agronomic factors.

scholarly journals ACÚMULO DE PARTICULADOS ATMOSFÉRICOS E SUA INFLUÊNCIA NOS PIGMENTOS FOTOSSINTÉTICOS DE DUAS ESPÉCIES ARBÓREAS NA CIDADE DE PATOS-PB, BRASIL

FLORESTA ◽  
2017 ◽  
Vol 47 (4) ◽  
pp. 365
Author(s):  
Jorge Danilo Zea-Camaño ◽  
Patrícia Carneiro Souto ◽  
Antonio Lucineudo De Oliveira Freire ◽  
Jacob Silva Souto ◽  
Romualdo Medeiros Cortez Costa ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Photosynthetic Pigments ◽  
Azadirachta Indica ◽  
Urban Areas ◽  
Urban Forest ◽  
Pearson Correlation ◽  
Clear Trend ◽  
Atmospheric Particulates ◽  
Chlorophyll A And B ◽  
The City

Partículas atmosféricas contaminantes em áreas urbanas associadas principalmente com a queima de combustíveis fosseis se depositam, em parte, na superfície das folhas das árvores. Isso promove alterações físicas nas plantas que podem ser analisadas por meio de suas respostas metabólicas. Este estudo objetivou avaliar a eficiência no acúmulo de particulados atmosféricos pela folhagem, assim como determinar a influência dos particulados nos pigmentos fotossintéticos clorofila a e b e carotenoides em árvores de Tabebuia aurea (Silva Manso) Benth. & Hook. f. ex S. Moore e Azadirachta indica A. Juss. localizadas em praças públicas na cidade de Patos-PB. Foram selecionadas árvores localizadas em dez praças públicas com alto e baixo fluxo veicular. O acúmulo de particulados atmosféricos nas folhas das árvores foi quantificado em laboratório e correlacionado com os resultados do teor dos pigmentos fotossintéticos. A determinação dos teores de clorofila a e b e carotenoides foi realizada segundo o método de Lichtenthaler e Buschmann com leitura em espectrofotômetro. Foi aplicado o teste t (p < 0,05) para comparação de médias e calculado o coeficiente de correlação de Pearson para avaliar as interações entre as variáveis. Os resultados evidenciam que a espécie T. aurea é mais eficiente do que A. indica na captura de partículas contaminantes suspensas no ar através de sua folhagem. Não foi demostrada uma tendência clara da influência do acúmulo de particulados atmosféricos na clorofila a e b e carotenoides, assim como da influência do fluxo veicular na retenção de particulados atmosféricos por ambas espécies.Palavras-chave: Poluição atmosférica, fotossíntese, arborização urbana, serviços ecossistêmicos, semiárido brasileiro.  AbstractAccumulation of atmospheric particulates and their influence on the photosynthetic pigments of two tree species in the city of Patos-PB, Brazil,..Contaminant atmospheric particles in urban areas associated with the burning of fossil fuels are deposited in part on the surface of the trees’ leaves; this promotes physical changes in the plants that can be analyzed through their metabolic responses. This study aimed to evaluate the efficiency of the accumulation of atmospheric particulates in the foliage as well as to determine the influence of the particulates in the photosynthetic pigments chlorophyll a and b and carotenoids in Tabebuia aurea (Silva Manso) Benth. & Hook. f. ex S. Moore and Azadirachta indica A. Juss. located in public squares, in the city of Patos-PB. Trees located in public places with both high and low vehicle traffic were selected. The accumulation of atmospheric particulates in the trees’ leaves was quantified in laboratory and correlated with the results of the content of the photosynthetic pigments. The determination of the levels of chlorophyll a and b and carotenoids was performed according to the method of Lichtenthaler and Buschmann with a spectrophotometer reading. The t test was used (p <0.05) to compare means and the Pearson correlation coefficient was calculated to evaluate the interactions between the variables. The results show that the T. aurea species is more efficient than A. indica at capturing contaminating particles suspended in the air through its foliage. A clear trend of the influence of the accumulation of atmospherics particulates on chlorophyll a and b and carotenoids has not been demonstrated, as well as the influence of the vehicular flow on the retention of atmospheric particulates by both species. Keywords: Air pollution, photosynthesis, urban forest, ecosystem services, Brazilian semiarid.

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