Avaliação de furanocumarinas como inibidores da fotossíntese através de ensaios de fluorescência da clorofila a

Sampaio, Olívia Moreira; Silva, Maria Fátima das Graças Fernandes da; Veiga, Thiago André Moura; King-Dı́az, Beatriz; Lotina‐Hennsen, Blas

doi:10.1590/s0100-40422012001100003

Cited by 12 publications

(7 citation statements)

References 11 publications

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“…Dai et al [ 54 ] demonstrated that a reduction in the PI ABS may reflect a decrease in the plant’s tolerance of the growing environment. Galić et al [ 55 ] concluded that the PI ABS can be used as a criterion for the selection of seeds with a high yield in heat-stressed environments, given that this index is more sensitive for the detection and quantification of damage, and that it relates the efficiency of the absorption, capture, and transfer of energy by photosystem II, which provides a better definition of the degree to which the stress of the environment affects the transportation of electrons [ 56 ].…”

Section: Discussionmentioning

confidence: 99%

Morpho-Anatomical and Physiological Responses Can Predict the Ideal Period for the Transplantation of Hydroponic Seedlings of Hymenaea courbaril, a Neotropical Fruit Tree

Sousa

Bessa

Silva

et al. 2020

Plants

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Hydroponics is an excellent alternative approach for the production of seedlings, given the growing demand for fruiting trees for the reforestation or recuperation of degraded natural landscapes. In most cases, however, little is known about the optimal period for the maintenance of the seedling in the hydroponic system. Given this, we decided to investigate the hypothesis that morpho-anatomical and physiological alterations can be used to predict the optimal timing for the transplantation of the seedlings to the soil substrate, thereby guaranteeing the most cost-effective application of the hydroponic system. We selected Hymenaea courbaril L., an important Neotropical fruit tree, as the model for this study. We cultivated H. courbaril seedlings in a static hydroponic system and evaluated morpho-anatomical, physiological, and growth parameters over the course of seedling development (30, 60, 90, 120, 150, and 180 days after transplantation; DAT). We observed an interesting relationship between the increase in the density (SD) and conductance (gsw) of the stomata up to 120 DAT, which reflected higher rates of photosynthesis (A), but also a reduced efficiency in the use of water. In the subsequent intervals, the SD of the plants and the diameter of the radicular xylemic vessels elements (RVE) decreased, in an attempt to increase the efficiency of the use of this resource. We also observed an increase in the thickness of the palisade parenchyma (PP) prior to 120 DAT, which did not reflect a general increase in the thickness of the mesophyll, indicating an adjustment in the thickness of the spongiform parenchyma (SP). We also observed a progressive increase in photosynthetic efficiency up to 120 DAT, based on parameters such as the absorption flux energy per active reaction center (ABS/RC) and the photosynthetic performance index (PIABS), but after this period these indices decreased progressively. However, as the PIABS is an indicator of the plant’s tolerance, its decline was associated with an increase in the dissipation of energy (DI0/RC), which indicates that, after 120 DAT, the plant pots may become a stress factor that limit the growth of H. courbaril seedlings. The results of the present study indicate conclusively that a 120-day period is the optimum for the maintenance of the H. courbaril seedlings in the hydroponic system, and also confirm the hypothesis that the morpho-anatomical and physiological responses observed in the plants can be used to predict the ideal period for the transplantation of the seedlings, contributing to a reduction in production time of the hydroponic system.

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Section: Discussionmentioning

confidence: 99%

Morpho-Anatomical and Physiological Responses Can Predict the Ideal Period for the Transplantation of Hydroponic Seedlings of Hymenaea courbaril, a Neotropical Fruit Tree

Sousa

Bessa

Silva

et al. 2020

Plants

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“…In this context, the influence of chalcone derivatives 7 a-e on PSII activity was assessed by measuring Chl a fluorescence parameters on Spinacia oleracea plant discs. [40][41][42][43][44] Among the evaluated compounds, chalcones 7 a and 7 e showed the best results, reducing the parameter PI abs by 84 % and 79 % (Figure 2 -Chart A), respectively, compared to control. Additionally, compounds 7 a and 7 e decreased the PI Total parameter by 84 % and 81 %, respectively (Figure 2 -Chart B).…”

Section: Chl a Fluorescencementioning

confidence: 98%

“…[11] Moreover, it is also important to mention the impact of manganese on the photosynthetic apparatus of Ligustrum lucidum and Melia azedarach plants. [12][13][14][15][16] The molecular docking approach has played important role in developing inhibitors for the PSII electron chain, providing valuable insights into the binding pose of ligands with the D1 protein of PSII. [17][18][19][20][21] In this context, indole derivatives with electron-withdrawing groups showed hydrogen bonding interaction between the OH group of Ser264 and the NH group of His252 with the nitro groups, along with hydrophobic interactions involving Phe211, Met214, His215, Leu218, Val219 and Leu271 residues.…”

Section: Introductionmentioning

confidence: 99%

“…For example, studies have investigated the effects of herbicides like U‐46 Combi Fluid, Cruz, MR, Basagran Bromicide, Lumax, and Gramoxone on Xanthium strumarium plants, [10] as well as explored the inhibitory effects of metamitron on electron transport chain in apple trees [11] . Moreover, it is also important to mention the impact of manganese on the photosynthetic apparatus of Ligustrum lucidum and Melia azedarach plants [12–16] …”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Evaluation of New Phytotoxic Fluorinated Chalcones as Photosystem II and Seedling Growth Inhibitors

de Pádua,

Pitteri,

Ferreira Basso

et al. 2024

Chemistry & Biodiversity

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The development of novel phytotoxic compounds has been an important aim of weed control research. In this study, we synthesized fluorinated chalcone derivatives featuring both electron‐donating and electron‐withdrawing groups. These compounds were evaluated both as inhibitors of the photosystem II (PSII) electron chain as well as inhibitors of the germination and seedling growth of Amaranthus plants. Chlorophyll a (Chl a) fluorescence assay was employed to evaluate their effects on PSII, while germination experiments were conducted to assess their impact on germination and seedling development. The results revealed promising herbicidal activity for (E)‐3‐(4‐bromophenyl)‐1‐(4‐fluorophenyl)prop‐2‐en‐1‐one (7a) and (E)‐1‐(4‐fluorophenyl)‐3‐phenylprop‐2‐en‐1‐one (7e). Compounds 7a and 7e exhibited a reduction in Chl a parameters associated with performance indexes and electron transport per reaction center. This reduction suggests a decrease in PSII activity, attributed to the blockage of electron flow at the quinone pool. Molecular docking analyses of chalcone derivatives with the D1 protein of PSII revealed a stable binding conformation, wherein the carbonyl and fluorine groups interacted with Phe265 and His215 residues, respectively. Additionally, at a concentration of 100 µM, compound 7e demonstrated pre‐ and post‐emergent herbicidal activity, resulting in a reduction of the seed germination index, radicle and hypocotyl lengths of Amaranthus weeds.

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“…Research on the biochemical reactions involved in the process of photosynthesis has led to the development and discovery of new herbicide prototypes with new sites and mechanisms of action, and with low human and environmental toxicity [8–16] . In this context, natural products as well as synthetic compounds have been investigated as prototypes for potential herbicides [17,18] .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Chalcone Derivatives as Photosynthesis and Plant Growth Inhibitors

Pádua

Souza

Sales

et al. 2021

Chemistry & Biodiversity

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We report the evaluation of chalcone derivatives as photosystem II (PSII) and plant growth inhibitors. Chalcone derivatives were evaluated as PSII inhibitors through Chl a fluorescence measurement. (E)-Chalcone (6a) and (E)-3-(4-bromophenyl)-1-(4-fluorophenyl)prop-2-en-1-one (6j) showed the best results, reducing the performance index on absorption basis parameter (PI abs ) by 70 %. Additionally, the decrease of TR 0 /RC and ET 0 / RC parameters indicates that the chalcone derivatives limited the number of active PSII reaction centers and the amount of trapped energy within them. Compounds 6a and 6j both act as post-emergent herbicides at 50 μM, reducing the root biomass of the Ipomoea grandifolia weed by 72 % and 83 %, respectively, corroborating the fluorescence results. The selectivity against weeds as compared to valuable crops by compounds 6a and 6j were evaluated employing Zea mays and Phaseolus vulgaris plants. In these, our newly synthesized compounds showed no effects on biomass accumulation of roots and aerial parts when compared to the control, providing valuable evidence for the role of these compounds as selective inhibitors of the growth of undesired weeds.

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Avaliação de furanocumarinas como inibidores da fotossíntese através de ensaios de fluorescência da clorofila a

Cited by 12 publications

References 11 publications

Morpho-Anatomical and Physiological Responses Can Predict the Ideal Period for the Transplantation of Hydroponic Seedlings of Hymenaea courbaril, a Neotropical Fruit Tree

Morpho-Anatomical and Physiological Responses Can Predict the Ideal Period for the Transplantation of Hydroponic Seedlings of Hymenaea courbaril, a Neotropical Fruit Tree

Synthesis and Evaluation of New Phytotoxic Fluorinated Chalcones as Photosystem II and Seedling Growth Inhibitors

Evaluation of Chalcone Derivatives as Photosynthesis and Plant Growth Inhibitors

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