Selective enzyme inactivation under water stress in maize (Zea mays L.) and wheat (Triticum aestivum L.) seedlings

Luna, M.; Badiani, Maurizio; Felici, M.; Artemi, F.; Sermanni, Giovanni Giovannozzi

doi:10.1016/0098-8472(85)90021-8

Cited by 23 publications

(19 citation statements)

References 25 publications

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“…Increased SOD activity under imposed oxidative drought stress (Table 2) was similar to the findings of Luna and et al (1985). Variations in SOD activity have been previously reported depending on drought severity, duration and species (Luna et al, 1985).…”

Section: O2supporting

confidence: 74%

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Effect of Foliar Zinc Application on Yield, Physiological Traits and Seed Vigor of Two Soybean Cultivars under Water Deficit

et al. 2016

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In order to study the effect of water deficit stress and zinc foliar application on yield, physiological traits and also on seed vigor and seedling emergence percentage in two soybean cultivars, an experiment was conducted as randomized complete block arrangement in split factorial design with three replications. The main factor was drought stress in three levels of optimal irrigation, withholding irrigation from vegetative growth stage and withholding irrigation from flowering stage; subordinate factors were the combination of foliar zinc application in three levels and two cultivars ('L17' and 'Clark 63'). Water deficit stress obviously decreased the yield, soluble protein and chlorophyll content in leaves. Proline and soluble sugars content were significantly increased in response to stress. Water deficit stress increased antioxidant enzymes activity. Also, water deficit stress decreased the germination rate, radicle and plumule dry weight. Foliar application with zinc sulfate increased the yield, germination rate and percentage, radicle and plumule weight. Zinc prevented the harmful effects of stress which caused decreasing of leaf protein, chlorophyll content and increasing proline and carbohydrate accumulation. In general, foliar application of zinc decreased the harmful effects of oxidative stress due to water deficit stress and improved growth conditions of plants.

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Section: O2supporting

confidence: 74%

“…Variations in SOD activity have been previously reported depending on drought severity, duration and species (Luna et al, 1985). Both of the hereby studied cultivars had different SOD activity (Table 2), with significant differences in the case of antioxidant enzymes activity.…”

Section: O2mentioning

confidence: 84%

Effect of Foliar Zinc Application on Yield, Physiological Traits and Seed Vigor of Two Soybean Cultivars under Water Deficit

et al. 2016

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“…However, various authors have reported unchanged activity (Luna et al, 1985;Moran et al, 1994), increase (Luna et al, 1985;Tezara & Lawlor, 1995;Wang & Huang, 2004), and decrease (Quartacci & Navari-Izzo, 1992;Wang & Huang, 2004) in SOD activity.…”

Section: Cat 60 Days ------------------------------------Unit Mg -1mentioning

confidence: 99%

Enzymatic antioxidant responses to biostimulants in maize and soybean subjected to drought

Vasconcelos

Zhang

Ervin

et al. 2009

Sci. agric. (Piracicaba, Braz.)

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Water stress is one of the most important environmental factors inducing physiological changes in plants, such as decrease in the water potential of the cells, the stomatal closure; and the development of oxidative processes mediated by reactive oxygen species (ROS). Antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) are efficient scavengers of ROS. The aim of this research was to examine how the application of biostimulant based on humic substances and aminoacids may affect activity levels of SOD, CAT, and APX of maize and soybean plants under well-watered or drought stress conditions. Pots (4.5 L) were filled with a Typic Hapludult soil where the biostimulants doses were applied. It was taken leaf samples in order to analyze SOD, CAT, and APX activities in plants. SOD and APX activity levels were increased by application of biostimulant 1 in maize subjected to stress. Catalase activity was not enhanced in plants by using the biostimulants. The composition of the biostimulants was not able to enhance stress tolerance in maize and soybean plants subjected to water stress. Key words: superoxide dismutase, catalase, ascorbate peroxidase, water status RESPOSTAS DE ENZIMAS ANTIOXIDANTES A BIOESTIMULANTES EM PLANTAS DE MILHO E DE SOJA SOB ESTRESSE HÍDRICORESUMO: O estresse hídrico é um dos mais importantes fatores ambientais que induz mudanças fisiológicas, como diminuição do potencial de água na célula, o fechamento dos estômatos e o desenvolvimento de processos oxidativos mediante a formação das espécies reativas de oxigênio (ROS). As enzimas antioxidantes superóxido dismutase (SOD), catalase (CAT) e ascorbato peroxidase (APX) são eficientes eliminadores das ROS. O objetivo deste estudo foi examinar como a aplicação de bioestimulantes com substâncias húmicas e aminoácidos em sua composição afeta os níveis de SOD, CAT e APX nos tecidos das folhas de plantas de milho e de soja cultivadas com ou sem estresse hídrico. Amostras de um Argissolo foram colocadas em vasos (4,5 L) onde foram adicionadas as doses dos bioestimulantes. Foram retiradas amostras de folhas para análise da atividade da SOD, CAT e APX nas plantas. A SOD e APX aumentaram nas plantas de milho com a aplicação do bioestimulante 1. A atividade da CAT não aumentou nas plantas com a aplicação dos bioestimulantes. As composições dos bioestimulantes não possibilitaram aumento na resistência ao estresse hídrico em plantas de milho e de soja submetidas ao estresse hídrico Palavras-chave: superoxide dismutase, catalase, ascorbate peroxidase, status hídrico

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“…With increases in our knowledge base of plant-stress responses, an increasing number ofstudies on enzyme responses to water stress have appeared (1-3, 6, 11, 14, 16, 21). Analyses of enzyme responses to water stress have been reported for (a) plants sub-jected to various concentrations of polyethylene glycol (1, 1 1,14,16); and (b) plants water stressed because of limitations of available soil water either in the greenhouse or in the field (2,3,6,21). These studies have attempted to relate the observed changes in enzyme activity to general effects of stress on plant growth.…”

mentioning

confidence: 99%

“…1) in conjunction with the temperature response curve for purified GR (Fig. 2) to calculate the amount of end product that could have been potentially produced in the 24 h periods for DOY 1 16 and 130. A comparison ofthe GR activity assuming a 25C assay temperature and the potential GR activity using the actual foliage temperature during each day is presented in Figure 3.…”

mentioning

confidence: 99%

Plant Morphological and Biochemical Responses to Field Water Deficits

Burke¹,

Hatfield²

1987

Plant Physiol.

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Activity of glutathione reductase has been related to stress tolerance; however, these enzyme assays are generally conducted at 25C. Foliage temperature varies greatly in the field in response to soil water availability and ambient conditions and this may affect enzyme response. This study was conducted to determine the effect of changing foliage temperature on glutathione reductase activity of wheat under field conditions. Wheat leaf glutathione reductase was purified and the temperature response of the enzyme was determined at 2.5°C intervals between 12.5 and 45C. These data, in conjunction with continuous measurements of field-grown wheat foliage temperatures, were used to compare the temperature-related changes in potential glutathione reductase activities in water stressed and control plants. Assuming saturating substrate levels, the results indicate that early in the season the daily potential enzyme activity of the irrigated and stressed plants could never have reached the daily activity predicted from the 25°C (room temperature) measurements. Later in the season, the daily potential activity of the irripted plants was lower, and the daily potential activity of the stressed plants was higher, than the activities predicted from the 25°C determinations. These results suggest that a better understanding of the regulation of plant metabolism will be obtained by linking continuous temperature measurements of plant foliage with enzyme responses to temperature.Studies of plant responses to water stress have focused on descriptive analysis of stress responses at the whole plant, the cell, and the metabolite level (8,10,12,17,19,20). With increases in our knowledge base of plant-stress responses, an increasing number ofstudies on enzyme responses to water stress have appeared (1-3, 6, 11, 14, 16, 21 Plants growing in environments with ample water supplies maintain, through transpiration, foliage temperature at or below air temperatures (13). Plants experiencing declining soil water levels ultimately have stomatal closure and reduced transpiration. Drought-induced stomatal closure limits carbon assimilation, yet may maximize the water use efficiency of the plant on a daily basis (4). As a consequence of the reduction in transpiration, foliage temperatures increase above the ambient temperature of the surrounding air (9). The elevated leaf temperatures may limit dry matter accumulation because of increased respiration, reduced photosynthesis, and cellular damage. Oxygen species within the leafcan increase during stress as a consequence of the transfer of electrons from the photosynthetic electron transport chain, at the level of Fd, to 02 (7). Excessive levels of these toxic oxygen species can damage plant tissues by several mechanisms, including the diversion of normal metabolic pathways into abnormal routes, the inactivation of enzymes, the formation of H202, lipid peroxidation, the formation of singlet oxygen, and the production of oxygen-free radicals.Plant cells contain high (mM) concentrations of GSH t...

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Selective enzyme inactivation under water stress in maize (Zea mays L.) and wheat (Triticum aestivum L.) seedlings

Cited by 23 publications

References 25 publications

Effect of Foliar Zinc Application on Yield, Physiological Traits and Seed Vigor of Two Soybean Cultivars under Water Deficit

Effect of Foliar Zinc Application on Yield, Physiological Traits and Seed Vigor of Two Soybean Cultivars under Water Deficit

Enzymatic antioxidant responses to biostimulants in maize and soybean subjected to drought

Plant Morphological and Biochemical Responses to Field Water Deficits

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