Geração e desintoxicação enzimática de espécies reativas de oxigênio em plantas

Barbosa, Marta Ribeiro; Silva, Marina de Araújo Departamento de Botânica Medeiros; Willadino, Lília; Ulisses, Cláudia; Câmara, Terezinha Rangel

doi:10.1590/s0103-84782014000300011

Cited by 147 publications

(116 citation statements)

References 34 publications

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“…The decreased CAT activity in situations of stress due to interspecies competition was most likely due to an increase of H 2 O 2 because CAT can be inactivated by binding with H 2 O 2 (Barbosa et al, 2014). High stress can also inhibit the synthesis of the enzyme or lead to changes in the assembly of its subunits, which may explain the decline in the activity of the enzymes tested in both species when subjected to competitive stress.…”

Section: Resultsmentioning

confidence: 98%

Change in Physiological Features in Ryegrass Biotypes in Competition With Soybean Due Resistance to Glyphosate

et al. 2016

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-Herbicide resistance can cause biochemical, physiological, morphological and phenological changes in weeds, altering their competitive ability against crops. The aim of the study was to assess physiological changes and cellular damage in susceptible and resistant biotypes of ryegrass and soybeans under competition. Three experiments were conducted in a greenhouse using a completely randomized design with four replications performed in a replacement series. The ratios of soybean and to susceptible (experiment 1) and resistant ryegrass (experiment 2) and of susceptible to resistant (experiment 3) ryegrass were 100:0, 75:25, 50:50, 25:75 and 0:100. Forty days after the emergence of the soybean crop and 60 days after the emergence of the ryegrass plants, the leaves of the competing plants were collected. The following variables were assessed: the levels of carotenoids, chlorophylls and total phenolic compounds; amount of hydrogen peroxide; degrees of lipid peroxidation and electrolyte leakage; and activity of enzymes catalase, superoxide dismutase and ascorbate peroxidase. The production of phenols and increased oxidative damage due to interspecies competition with ryegrass was, in general, observed in the soybeans; the ryegrass biotypes, susceptible and resistant to glyphosate, coexisting with soybean have generally higher oxidative damage due to intraspecific competition; since when these biotypes coexist not present modifications of these parameters.Keywords: oxidative stress, antioxidant enzymes, adaptability of herbicide resistant plants. RESUMO -A resistência aos herbicidas pode causar mudanças bioquímicas,fisiológicas, morfológicas ou fenológicas nas plantas daninhas alterando a capacidade competitiva com as culturas.O objetivo do estudo foi verificar alterações na fisiologia e os danos celulares em biótipos de azevém resistente

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Section: Resultsmentioning

confidence: 98%

Change in Physiological Features in Ryegrass Biotypes in Competition With Soybean Due Resistance to Glyphosate

et al. 2016

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“…Salt stress triggers a secondary stress, oxidative, which is characterized by the increase in the generation of reactive oxygen species (ROS) (Gill & Tuteja, 2010), capable of causing damages to the macromolecules and cell structures and even leading to plant death (Foyer & Noctor, 2009). To combat ROS, plants have developed an efficient antioxidative defense mechanism, which acts through the synthesis of metabolites and activation of a complex enzymatic system (Barbosa et al, 2014). Among these enzymes, superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX) stand out.…”

Section: Introductionmentioning

confidence: 99%

Production and antioxidative metabolism in bell pepper grown with saline water in hydroponic system

Lima

Morais

Silva

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThis study aimed to evaluate the effect of salt stress on production and antioxidative defense metabolism of two bell pepper cultivars (Capsicum annuum L.) grown hydroponically. The experimental design was in randomized blocks, with treatments arranged in a 5 x 2 factorial scheme with five replicates. The treatments consisted of five salinity levels of the nutrient solution (2.0, 3.5, 4.5, 5.5 and 6.5 dS m -1 ) with two bell pepper cultivars, 'Bruno' and 'Rúbia' . Biomass and yield were reduced with increasing salinity. The contents of chlorophyll a, b and total decreased with increasing salinity. There was an increase in proline content and activity of superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX), showing the activation of the antioxidant defense mechanism. The higher yield in the cv. 'Rúbia' , as well as the greater activity of the APX and the lower levels of chlorophyll content, reflect the best acclimatization of this cultivar to saline stress. The estimated yield of the cv. 'Rúbia' , 39.9 t ha -1 when grown with ECs of up to 3.5 dS m -1, indicates the feasibility of its commercial cultivation in hydroponic conditions. Produção e metabolismo antioxidativo em pimentão cultivado com água salina em sistema hidropônico R E S U M O Este trabalho foi realizado com o objetivo de avaliar o efeito do estresse salino sobre a produção e o metabolismo de defesa antioxidativa de duas cultivares de pimentão (Capsicum annuum L.), cultivadas em sistema hidropônico. O delineamento experimental foi em blocos casualizados, com os tratamentos arranjados em esquema fatorial 5 x 2, com cinco repetições. Os tratamentos consistiram da combinação de cinco níveis de salinidade da solução nutritiva (2,0; 3,5; 4,5; 5,5 e 6,5 dS m -1 ) com duas cultivares de pimentão (Bruno e Rúbia). A biomassa e a produção foram reduzidas com o incremento da salinidade. Os teores de clorofila a, b e total, diminuíram com o aumento da salinidade. Houve aumento no teor de prolina e na atividade das enzimas superóxido dismutase (SOD), catalase (CAT) e ascorbato peroxidase (APX), evidenciando a ativação do mecanismo de defesa antioxidativo. A maior produção de frutos na cv. Rúbia, bem como a maior atividade da APX e os menores teores de clorofilas refletem a melhor aclimatação desta cultivar ao estresse salino. A produtividade estimada da cv. Rúbia, 39,8 t ha , indica a viabilidade de seu cultivo comercial em condições hidropônicas.

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“…To reduce the damage caused by oxidative stress, plants have a defense system that includes several antioxidant enzymes in different cell compartments. Among the main enzymes are superoxide dismutase (SOD) which, together with other enzymes, such as catalase (CAT) and ascorbate peroxidase (APX), promote the elimination of ROS, the main cause of oxidative stress (Barbosa et al, 2014). The balance of antioxidant enzyme activity is crucial in suppressing toxic levels of ROS in cells (Barbosa et al, 2014).…”

Section: Experiments Imentioning

confidence: 99%

“…Among the main enzymes are superoxide dismutase (SOD) which, together with other enzymes, such as catalase (CAT) and ascorbate peroxidase (APX), promote the elimination of ROS, the main cause of oxidative stress (Barbosa et al, 2014). The balance of antioxidant enzyme activity is crucial in suppressing toxic levels of ROS in cells (Barbosa et al, 2014). The involvement and role of antioxidants as plants protection agents against oxidative stress has been demonstrated in 7 several studies involving abiotic stress.…”

Section: Experiments Imentioning

confidence: 99%

“…Oxidative stress is characterized by an increase on the production of reactive oxygen species (ROS), due to alterations on the antioxidant system or unbalance among them (Barbosa et al, 2014). The degree of oxidative stress in a cell is determined by the amount of superoxide radicals, hydrogen peroxide and hydroxyl radicals (Barreiros et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Biochemical Alterations of Weeds in Response to Stress Caused by Herbicides and Total Plant Submersion

et al. 2018

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-The maximum biological efficiency of a herbicide is performed when the plants are in favorable condition to absorb and metabolize it. Stress situations, such as total submersion, cause stress in plants, reducing weed control efficiency and crop yield. The objective of this study was to verify whether different soil water content and herbicide treatments alter the components of the secondary metabolism and cause cellular damage in weed species Two experiments were conducted (I and II) in a completely randomized experimental design with a factorial scheme (2 x 2 x 4 and 2 x 5, respectively) and three replicates. The first experiment was conducted with two species (Leersia hexandra and Luziola peruviana), which were submitted to four herbicide treatments and soil moisture levels (field capacity and total submersion). Experiment II was performed with cockspur grass plants submitted to five herbicide treatments and the same soil moisture levels from experiment I. Leaf samples were collected for laboratory analyses seven days after establishing the soil moisture levels. Assessmentes were made for the levels of chlorophyll and carotenoids, activity of antioxidant enzymes, as well as levels of hydrogen peroxide and cellular damage. The results showed that all plant species studied showed higher oxidative stress under field capacity than under submersion. L. hexandra shows greater oxidative stress than L. peruviana regardless of the treatment applied: water regime or herbicide. Furthermore, the associations of glyphosate + clomazone and glyphosate + mixture of imazapyr + imazapic caused greater oxidative stress in L. hexandra and L. peruviana than glyphosate alone. All herbicides caused lipid peroxidation, reduced enzyme activity decreased concentrations of total chlorophyll, chlorophyll a and carotenoids on cockspur grass. Keywords: Luziola peruviana, Leersia hexandra, Echinochloa crus-galli,oxidative stress, chemical control. RESUMO -

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Geração e desintoxicação enzimática de espécies reativas de oxigênio em plantas

Cited by 147 publications

References 34 publications

Change in Physiological Features in Ryegrass Biotypes in Competition With Soybean Due Resistance to Glyphosate

Change in Physiological Features in Ryegrass Biotypes in Competition With Soybean Due Resistance to Glyphosate

Production and antioxidative metabolism in bell pepper grown with saline water in hydroponic system

Biochemical Alterations of Weeds in Response to Stress Caused by Herbicides and Total Plant Submersion

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