Efeitos da aplicação de herbicidas sobre a eficiência fotoquímica em plantas de soja convencional e geneticamente modificada

Corrêa, Maria José Pinheiro; Alves, Pedro Luís da Costa Aguiar

doi:10.1590/s1413-70542010000500009

Cited by 12 publications

(7 citation statements)

References 16 publications

(13 reference statements)

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“…Fv showed reduction of 16.59% per unit increase in ECw, with maximum point in the control treatment (0.6 dS m -1 ) and mean value of 1773 ( Figure 1C (Corrêa & Alves, 2010). The Fv/ Fm ratio with values below that range reflect photoinhibitory damages in the reaction centers of photosystem II.…”

Section: Resultsmentioning

confidence: 94%

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

Sousa

Gheyi

Brito

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThis study aimed to evaluate the salt tolerance of 'Mimo do Céu' orange grafted onto three rootstocks using physiological parameters such as maximum quantum efficiency of photosystem II (PSII) and the production of fruits. It also evaluated the effectiveness of increased nitrogen (N) fertilization in reducing the effects of salt stress. Two concomitant experiments were carried out under controlled conditions, using drainage lysimeters. The Experiment I evaluated the effects of the application of five levels of saline water on three combinations of scion-rootstocks grafted with 'Mimo de Ceu' orange, in a randomized block design with three replicates in a 5 x 3 factorial scheme. The Experiment II evaluated the application of two N levels (100 and 200% of recommendation) in three scion-rootstock combinations irrigated with water of electrical conductivity of 3.0 dS m -1 , in a 3 x 2 factorial scheme, with three replicates. The maximum quantum efficiency of PSII was inhibited in citrus plants under salt stress. 'Mimo do Ceu' orange grafted onto 'Common' Rangpur lime has higher yield potential. The increase in N dose did not reduce the deleterious effects of water salinity on fruit production.Eficiência quântica do fotossistema II e produção de laranjeira sob estresse salino e adubação nitrogenada R E S U M O Objetivou-se, com este trabalho, avaliar a tolerância ao estresse salino da laranjeira 'Mimo do Céu' enxertada em três porta-enxertos utilizando como parâmetros fisiológicos, a eficiência quântica do fotossistema II e a produção de frutos. Também se avaliou a eficiência máxima do incremento da adubação nitrogenada na redução dos efeitos do estresse salino; para tanto foram realizados dois experimentos concomitantes em condições controladas e com auxílio de lisímetros de drenagem. No Experimento I foram estudados em blocos casualizados com três repetições, em esquema fatorial 5 x 3, cinco níveis de salinidade da água e três combinações de copa/porta-enxerto e no Experimento II estudou-se a aplicação de duas doses de N (100 e 200% da recomendação) em plantas das três combinações de copa/porta-enxerto irrigadas com águas de condutividade elétrica de 3,0 dS m -1 , em esquema fatorial 3 x 2 com três repetições. A eficiência máxima quântica do PSII foi inibida nas plantas cítricas com estresse salino; já o aumento do teor salino da água de irrigação reduz a produção de frutos e a laranjeira 'Mimo do Céu' enxertada no Limoeiro Cravo 'Comum' possui maior potencial produtivo. O aumento na fertilização nitrogenada não reduziu os efeitos da salinidade sobre a produção total de frutos.

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Section: Resultsmentioning

confidence: 94%

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

Sousa

Gheyi

Brito

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…The efficiency of the photosynthetic apparatus of soybean plants (Fv/Fm) was little affected by sowing conditions, and significant reductions were observed only when weeds ("vegetation" condition) were present in the first planting row (Table 2). The competition between weeds and soybean plants for environmental resources was substantially harmful to the photochemical apparatus and chlorophyll α fluorescence (Fv/Fm) of the soybean crop, since photosynthesis is extremely dependent on environmental factors such as light, temperature, CO2, water, and mineral nutrient availability (Corrêa & Alves, 2010). Changes in the kinetics of maximum chlorophyll α fluorescence of photosynthetic organisms are the result of frequent changes in photosynthetic activity, especially regarding the quantum efficiency of electron transport through photosystem II in leaves, thus evidencing the disturbances caused by the competition imposed by weeds (Yusuf et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

Effect of eucalyptus proximity and weed presence on soybean grown in a CFI system

Marques¹,

Marchi²,

Pinheiro³

et al. 2020

Científica

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The growing demand for food, bioenergy, and forest products requires solutions that encourage socioeconomic development without compromising the sustainability of natural resources. It is in this scenario that the integration strategy has been pointed as an alternative to reconcile conflicts of interest. This study evaluates possible changes in nodulation, photosynthetic efficiency, and yield of soybean grown in a Crop-Forest Integration system with eucalyptus as a tree component. The experiment was conducted in a randomized complete block design with four replications. Treatments were arranged in a 3x5 factorial scheme, corresponding to three sowing conditions (near eucalyptus stands; 3.0 meters away from the stands, in a clean seedbed; and 3.0 m away from the stands, among the vegetation) and five points of distance between soybean and the stands, represented by planting rows, namely: 1 st , 2 nd , 3 rd , 11 th , and 21 st row. We evaluated morphophysiological and productive variables of soybean plants. Soybean cultivation near eucalyptus stands does not affect the number and dry matter of soybean nodules, but reduces yield in the first two rows. The presence of weeds in the range between eucalyptus stands and soybean plants impaired the photochemical apparatus and the chlorophyll α fluorescence of soybean crop, decreasing the shoot dry matter accumulation, number and dry matter of nodules, and yield of plants present in the first planting rows.

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“…Also, glyphosate can reduce the activity of the enzyme ribulose-1.5-bisphosphate carboxylase/oxygenase (Rubisco), which is necessary for carbon fixation in the process of photosynthesis. This can lead to reduced photosynthetic efficiency and reduced plant growth and yield (Korpita & Shuvar, 2020;Soares et al, 2020) In addition, active substances such as atrazine and metribuzin have been shown to disrupt the electron transport chain in photosynthesis, leading to a decrease in energy production and photosynthetic activity (Corrêa & Alves, 2010;Shuvar et al, 2022). Certain herbicides can disrupt the electron transport chain in photosynthesis, which can lead to reduced energy production and photosynthetic activity.…”

Section: Discussionmentioning

confidence: 99%

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2023

UBSRAS

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Efeitos da aplicação de herbicidas sobre a eficiência fotoquímica em plantas de soja convencional e geneticamente modificada

Cited by 12 publications

References 16 publications

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

Quantum efficiency of photosystem II and production of orange under salt stress and nitrogen fertilization

Effect of eucalyptus proximity and weed presence on soybean grown in a CFI system

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