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24-epibrassinolide regulated diminution of Cr metal toxicity in Brassica juncea L. plants Braz. J. Plant Physiol.
Arora,Priya; Bhardwaj,Renu; Kanwar,Mukesh Kumar.
The present work was undertaken to study the effects of 24-epibrassinolide (0, 10-10, 10-8 and 10-6 M) on growth (shoot length and number of leaves), protein content and activities of antioxidative enzymes [guaiacol peroxidase (EC 1.11.1.7), catalase (EC 1.11.1.6), glutathione reductase (EC 1.6.4.2), ascorbate peroxidase (EC 1.11.1.11), superoxide dismutase (EC 1.15.1.1), monodehydroascorbate reductase (EC 1.1.5.4) and dehydroascorbate reductase (EC 1.8.5.1)] in leaves of 60 days-old Brassica juncea L. plants treated with different concentrations of Cr metal. It was observed that treatment of different concentrations (0, 0.5, 1.0, 1.5 and 2.0 mM) of Cr metal alone decreased the shoot length and number of leaves and regulated the enzyme activities and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidative enzymes; Brassinosteroids; Metal toxicity.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000300002
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28-Homobrassinolide alleviates oxidative stress in salt-treated maize (Zea mays L.) plants Braz. J. Plant Physiol.
Arora,Nitika; Bhardwaj,Renu; Sharma,Priyanka; Arora,Hardesh K..
Tipo: Info:eu-repo/semantics/other
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000200007
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Activation of nitrate reductase of cashew leaf by exogenous nitrite Braz. J. Plant Physiol.
Viégas,Ricardo Almeida; Silveira,Joaquim Albenísio Gomes.
Nitrate reductase (NR) plays a central role in plant primary metabolism and exhibits complex regulation mechanisms for its catalytic activity. There is controversy in the literature concerning the possible direct effect of NO2- on the stimulation and/or activation of NR activity. The influence of NO2- was studied on the NR activity in the leaves of 30-day-old cashew (Anacardium occidentale L.) seedlings. Addition of NO2- to the reaction mixture containing leaf enzymatic extract resulted in a remarkable increase in NR activity. A trace amount (5 mumol.L-1) of NO2- was required to achieve full NR activity. The in vitro NR-activity showed a steady time-dependent increase when incubated in the presence of only NO3- + NO2-. In contrast, in vitro NR activity was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anacardium occidentale; Enzymes; NADH; Nitrate metabolism; Nitrate reductase.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000100005
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Activation of phenylalanine ammonia lyase as a key component of the antioxidative system of salt-challenged maize leaves Braz. J. Plant Physiol.
Gholizadeh,Ashraf; Kohnehrouz,B. Baghban.
Differential antioxidative activities were assessed in the leaves of two maize inbreds (A-180 and A-619) under salt stress and the subsequent recovery period. Total antioxidation test revealed that in both inbreds, this ability was sharply increased during stress period, but was slowly reverted back to the normal level during recovery. The enzymatic antioxidative analysis showed differential patterns in the activities of catalase, peroxidase and polyphenol oxidase in both maize inbreeds. Comparative analysis of the activity of phenylalanine ammonia lyase (PAL), a key enzyme at the gateway of propanoid biosynthetic pathway, suggested that propanoid compounds might be antioxidants of pivotal importance to the salt-challenged maize antioxidation system. As...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidation; Maize; Salt stress; PAL; Catalase; Peroxidase; Polyphenol oxidase.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000400001
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Activation of phospholipase PLA2 actvity in Ricinus communis leaves in response to mechanical wounding Braz. J. Plant Physiol.
Domingues,Sarah J.S.; Souza,Thiago F. de; Soares,Alexandra M.S.; Jacinto,Tânia; Machado,Olga L.T..
In order to investigate the defense response in castor bean (Ricinus communis) against predators, we analyzed the effect of mechanical wounding upon the phospholipase A2 (PLA2) activity of leaf extracts. Time course experiments revealed that the highest levels of increased PLA2 activity (ca. two fold) occurred 15 min and 60 min after injury. The induced activities demonstrated high sensitivity towards aristolochic acid (10 mM), a PLA2 inhibitor. Based on SDS-PAGE analysis, the PLA2 activity induced 15 min after wounding migrated with a molecular mass of 40 kDa and was denoted RcPLA2 I. The protein activity induced 60 min after wounding, RcPLA2 II, migrated with a molecular weight of 14 kDa. Furthermore its N-terminal sequence shared homology with PLA2 from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cellular defense; Castor bean; Plant signaling; Phospholipase A2; Ricinus communis.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000100004
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Activity of alternative oxidase and plant uncoupling mitochondrial protein in potato tubers stored at low temperature or submitted to artificial aging Braz. J. Plant Physiol.
Pinheiro,Hugo Alves; Borges,Regis; Silva,Marco Aurélio Pedron e; Centeno,Danilo Cruz.
Potato tubers (Solanum tuberosum L. cv. Binje) were stored at 18 and 4ºC in order to verify changes in mitochondrial metabolism, especially in the activities of the alternative oxidase (AOX) and plant uncoupling mitochondria protein (PUMP). Tubers were also sliced and submitted to artificial aging. The oxygen consumption rate (OCR), respiratory control (RC) and ADP/O ratio for mitochondria obtained after storage at 18ºC were not altered, regardless of the time of storage. Considerable increment in OCR, for both respiratory states 3 and 4, was observed after storing the tubers for five and ten days at 4ºC; and it was accomplished by reductions in RC and ADP/O. The AOX activity was evident after five days at 4ºC, and it was enhanced after ten days of storage...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Solanum tuberosum L.; Mitochondrial swelling; Oxidative stress; Respiration.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202004000200001
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Adaptability and leaf anatomical features in oil palm seedlings produced by embryo rescue and pre-germinated seeds Braz. J. Plant Physiol.
Luis,Zanderluce G.; Bezerra,Kadja Milena G.; Scherwinski-Pereira,Jonny Everson.
Changes in the leaf structure of plants grown in different conditions have been reported, such as increase in size and density of stomata and reduction in stomatal control, amount of epicuticular wax, and mesophyll thickness, with a high diversity of intercellular spaces. However, these changes are highly variable depending on the physiological and morphological characteristics of each species. The objective of this work was to analyze the adaptability and anatomical plasticity of oil palm seedlings produced after embryo rescue and pre-germinated seeds. Expanded leaves were prepared for evaluation of morphometric data and anatomical structures. It was verified that the environmental conditions in vitro negatively influenced the stomata density, epidermal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Elaeis guineensis; Arecaceae; Germination; Embryo culture; Acclimatization; Plantlets metabolism.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000300008
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Alterations in biochemical components in mesta plants infected with yellow vein mosaic disease Braz. J. Plant Physiol.
Chatterjee,Arpita; Ghosh,Subrata K..
Yellow vein mosaic disease of mesta (kenaf, Hibiscus cannabinus L.; and roselle, H. sabdariffa L.) is a new entrant to the disease scenario and it is associated with a novel monopartite Begomovirus. Changes in different biochemical parameters in diseased mesta plants were observed as compared to healthy ones. Isozyme pattern and assays of different enzymes, namely catalase, acid phosphatase, peroxidase, esterase, polyphenol oxidase and superoxide dismutase, revealed lower activities of catalase, acid phosphatase and peroxidase enzymes and enhanced activities of esterase, polyphenol oxidase and superoxide dismutase in diseased plants as compared to healthy ones. Due to the infection, chlorophyll content, phenolics and total soluble protein decreased whereas...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Begomovirus; Chlorophyll; Hibiscus; Isozyme pattern; Phenolics; Proline.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000400002
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Alterations in fatty acid composition due to cold exposure at the vegetative stage in rice Braz. J. Plant Physiol.
Cruz,Renata Pereira da; Golombieski,Jaqueline Ineu; Bazana,Maiara Taís; Cabreira,Caroline; Silveira,Taíse Foletto; Silva,Leila Picolli da.
Rice is a tropical plant, so cold temperature may be detrimental to its development, depending on the genotype and environmental conditions. Degree of lipid unsaturation has been related to cold tolerance due to its effect on membrane stability. So, the aim of this study was to characterize the fatty acid composition and its alterations due to cold temperature in rice genotypes of diversified origin. Forty-four rice genotypes at the V4 stage were submitted to two temperature conditions: 10°C and 28°C for two days and after this they had their leaves collected for lipid extraction and quantification. Control plants were allowed to regrow until presenting four leaves fully expanded and then were subjected to 10°C for ten days for cold tolerance evaluation....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oryza sativa L.; Lipid; Linolenic acid; Cold tolerance; Membrane stability; Plant survival.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000300007
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Alterations in leaf anatomy and physiology caused by the red mite (Oligonychus ilicis) in plants of Coffea arabica Braz. J. Plant Physiol.
Fahl,Joel I.; Queiroz-Voltan,Rachel B.; Carelli,Maria Luiza C.; Schiavinato,Marlene A.; Prado,Ana K. S.; Souza,Júlio C..
Three degrees of red mite infestation (Oligonychus ilicis McGregor) (Acari: Tetranychidae) were evaluated with regard to leaf anatomy, photosynthetic gas exchange and leaf ethylene production, in a commercial crop of approximately 12-year-old trees of Coffea arabica 'Catuaí Vermelho'. As a complementary study, foliar anatomy was also evaluated in a recuperated crop of C. arabica 'Mundo Novo' that had presented a high degree of red mite infestation during the dry period of the prior growing season. The red mite-infested leaves were bronze-coloured, with intensity proportional to the degree of internal damage. On feeding, the red mite introduces its stylet in the adaxial epidermis and, as a result, chloroplasts are destroyed in the feeding area. The number...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffee; Ethylene; Leaf structure damage; Photosynthetic gas exchange.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000100007
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Ameliorative effect of exogenous nitric oxide on oxidative metabolism in NaCl treated chickpea plants Braz. J. Plant Physiol.
Sheokand,Sunita; Bhankar,Vinita; Sawhney,Veena.
Accumulation of salts in irrigated soils is one of the primary factors limiting yield in South Asia. We investigated whether exogenous nitric oxide (NO) supplementation as sodium nitroprusside has any ameliorating effect against NaCl induced oxidative damage in chickpea leaves. NaCl treatment (250 mM) alone and in combination with two concentrations of SNP (0.2 and 1 mM) were given to 50 days old chickpea plants for 2, 4 and 6 days. Salt stress adversely affected the relative membrane injury, lipid peroxidation levels, relative water content (RWC) and H2O2 content. The effect was time dependent. SNP treatments could ameliorate the toxic effect of short term salt stress of 2 days on relative membrane injury and partial amelioration was observed with 4 and 6...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant enzymes; Chickpea; Lipid peroxidation; Nitric oxide; Salt stress.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000200002
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Amino acid and ureide transport in the xylem of symbiotic soybean plants during short-term flooding of the root system in the presence of different sources of nitrogen Braz. J. Plant Physiol.
Thomas,André Luís; Sodek,Ladaslav.
The transport of organic N compounds to the shoot in the xylem sap of nodulated soybean plants was investigated in an attempt to better understand the changes in N metabolism under root hypoxia (first 5 days of flooding), with different sources of N in the medium. NO3- is beneficial for tolerance of plants to waterlogging, whereas other N sources such as NH4+ and NH4NO3, are not. Nevertheless, in the presence of NH4+ high levels of amino acids were transported in the xylem, consistent with its assimilation. Some increase in the transport of amino acids was also seen with NO3- nutrition during waterlogging, but not with N-free medium. Ureide transport in the xylem was severely reduced during waterlogging, consistent with impaired N2 fixation under these...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Alanine; Hypoxia; N metabolism.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000200010
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An instrumental set up for seed germination studies with temperature control and automatic image recording Braz. J. Plant Physiol.
Teixeira,Pedro C.N.; Coelho Neto,José A.; Rocha,Humberto; Oliveira,Juracy M. de.
This paper describes a new instrumental methodology proposed for the study of seed germination which can be applied to germination physiology, agriculture and forest restoration. This instrument performs the recording of images of germinating seeds through the use of a flat-bed scanner coupled to a computer, where a specific program commands the capture of these images at predetermined time intervals. These images are archived for posterior analysis. The device allows the collection of data and the elaboration of germination curves with high accuracy. Furthermore, the device permits the study of seed germination over a broad range of temperatures as well as the easy application of chemical agents to the seeds in order to study their influence on the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Digital image; Lactuca sativa; Scanner; Siegel's test; Thermal gradient tables.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000200002
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An outlook on ion signaling and ionome of mycorrhizal symbiosis Braz. J. Plant Physiol.
Ramos,Alessandro C.; Façanha,Arnoldo R.; Palma,Livia M.; Okorokov,Lev A.; Cruz,Zilma M.A.; Silva,Ary G.; Siqueira,Arthur F.; Bertolazi,Amanda A.; Canton,Gabriela C.; Melo,Juliana; Santos,Wolmen O.; Schimitberger,Vanusa M. B.; Okorokova-Façanha,Anna L..
The 450-million-year-old interaction between the majority of land plants and mycorrhizal fungi is one of the most ancient, abundant, and ecologically important symbiosis on earth. The early events in the evolution of mycorrhizal symbioses seem to have involved reciprocal genetic changes in ancestral plants and free-living fungi. new data on the mechanism of action of specific signaling molecules and how it influence and is influenced by the membrane ions fluxes and cytoplasm ion oscillations which integrate the symbiotic ionome are improving our understanding of the molecular bases of the mycorrhization process. This mini-review will highlight topics regarding what is known about the ionome and ionic communication in the arbuscular mycorrhizal symbiosis...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ion dynamics; Íon signaling; Mycorrhiza; Ionomics; Plant synapsis.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000100010
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An overview of preharvest factors influencing mango fruit growth, quality and postharvest behaviour Braz. J. Plant Physiol.
Léchaudel,Mathieu; Joas,Jacques.
Mango, a tropical fruit of great economic importance, is generally harvested green and then commercialised after a period of storage. Unfortunately, the final quality of mango batches is highly heterogeneous, in fruit size as well as in gustatory quality and postharvest behaviour. A large amount of knowledge has been gathered on the effects of the maturity stage at harvest and postharvest conditions on the final quality of mango. Considerably less attention has been paid to the influence of environmental factors on mango growth, quality traits, and postharvest behaviour. In this paper, we provide a review of studies on mango showing how environmental factors influence the accumulation of water, structural and non-structural dry matter in the fruit during...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Environmental conditions; Fruit load; Irrigation; Shelf life; Size; Taste.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400004
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An overview of the Brazilian Journal of Plant Physiology: we need a push! Braz. J. Plant Physiol.
Mazzafera,Paulo; Azevedo,Ricardo Antunes de.
Tipo: Info:eu-repo/semantics/other
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000400001
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Anatomical characteristics and enzymes of the sucrose metabolism and their relationship with latex yield in the rubber tree (Hevea brasiliensis Muell. Arg.) Braz. J. Plant Physiol.
Mesquita,Alessandro Carlos; Oliveira,Luiz Edson Mota de; Mazzafera,Paulo; Delú-Filho,Nelson.
Rubber production is dependent on the availability of carbohydrates in the tissues engaged in latex synthesis. In this study three rubber tree clones were used to study the protein profile, the activities of invertase and sucrose synthase in the latex and anatomical characteristics of the bark, as well as to establish a possible relationship with latex production. The clones used in the study, RRIM 600, GT 1 and Fx2261, differed in latex productivity, from high to low in this order. Although present, few differences were observed in the latex protein profile obtained by denaturing electrophoresis. The activity of neutral invertase was higher than the acidic isoform, and both activities were higher in the most productive clones RRIM 600 and GT 1. The same...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hevea brasiliensis; Invertase; Lacticiferous vessels; Latex; Rubber; Sucrose synthase.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000200002
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Antioxidant and other biochemical defense responses of Macrotyloma uniflorum (Lam.) Verdc. (Horse gram) induced by high temperature and salt stress Braz. J. Plant Physiol.
Naji,Khalid Mohammed; Devaraj,V. R..
High temperature and salinity are the major ecological factors challenging crop productivity in the arid and semiarid regions of the world. Effects of high temperature (43-45°C) and salt stress (0.6 M) on Macrotyloma uniflorum (Lam.) Verdc. (Horse gram), were evaluated in terms of antioxidants and antioxidant enzymes. Both treatments caused typical stress responses in this tropical leguminosae. Oxidative stress indicators such as H2O2, TBARS, and proline were significantly elevated. Similarly, the antioxidant enzymes superoxide dismutase (SOD; EC 1.15.1.1), guaiacol peroxidase (POX; EC 1.11.1.7) and acid phosphates (AP; EC 3.1.3.2) were significantly elevated while catalase (CAT; EC 1.11.1.6) was reduced. These treatments had contrasting effects on...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant enzymes; Horse gram; Isozymes; Oxidative stress; Salinity; Stress markers.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000300002
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Antioxidant system response induced by aluminum in two rice cultivars Braz. J. Plant Physiol.
Ribeiro,Cleberson; Cambraia,José; Peixoto,Paulo Henrique Pereira; Fonseca Júnior,Élcio Meira da.
The antioxidant defense system response was evaluated in two rice cultivars (Oryza sativa L.), Fernandes (CNA-1158) and Maravilha (CNA-6843-1), treated with toxic levels of aluminum. After exposure to aluminum we determined plant growth, H2O2 and O2•- contents, lipid peroxidation, antioxidant enzymes activities and ascorbate and dehydroascorbate contents. Al predominantly accumulated in roots of both cultivars but it reduced root and shoot growth only in the Maravilha cultivar. Treatment with aluminum resulted in a reduction of 84 and 60% in the levels of H2O2 in the roots of the cultivars Maravilha and Fernandes, respectively, and of 26% in the levels of O2•- only in the roots of Fernandes cultivar. Increased lipid peroxidation was observed only in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aluminum; Enzymes; Reactive oxygen species; Oryza sativa; Oxidative stress.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000200004
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Antioxidant-enzymatic system of two sorghum genotypes differing in salt tolerance Braz. J. Plant Physiol.
Costa,Paulo Henrique Alves da; Neto,André Dias de Azevedo; Bezerra,Marlos Alves; Prisco,José Tarquinio; Gomes-Filho,Enéas.
Two forage sorghum genotypes were studied: CSF18 (salt-sensitive) and CSF20 (salt-tolerant). Shoot growth reduction as a result of salt stress was stronger in the salt sensitive genotype compared to the salt tolerant one. When the two genotypes were subjected to salt stress (75 mM NaCl) no significant change in lipid peroxidation was observed. However, salt stress induced increases in superoxide dismutase and catalase activities in both genotypes. These salt-induced increases were higher in the salt-tolerant genotype. Peroxidase activity was differentially affected by salt stress in the two genotypes. The activities of these peroxidases were decreased by salt stress in the salt-sensitive genotype and increased in the salt-tolerant genotype. In addition,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sorghum bicolor; Antioxidant-enzymatic system; Lipid peroxidation; Oxidative stress; Salinity.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000400003
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