Plântulas de soja 'Tracajá' expostas ao ozônio sob condições controladas

Bulbovas, Patricia; Souza, Sílvia Ribeiro de; Moraes, Regina Maria de; Luizão, Flávio J.; Artaxo, Paulo

doi:10.1590/s0100-204x2007000500005

Cited by 9 publications

(6 citation statements)

References 27 publications

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“…Ascorbic acid has really been indicated as one of the most important antioxidants and a key indicator of environmental stresses in several plant species. 1,35,36,38,42,43 Numerous studies have observed that the activity of SOD, POD and other enzymatic antioxidants can oscillate in plants grown in an oxidative environment, 1,44,45 depending on the stage of development and/or intrinsic metabolic rhythms 46,47 interfering with their responses to O 3 .…”

Section: Discussionmentioning

confidence: 99%

Critical analysis of the potential of Ipomoea nil ‘Scarlet O'Hara’ for ozone biomonitoring in the sub-tropics

et al. 2012

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This study aimed to analyze critically the potential of Ipomoea nil'Scarlet O'Hara' for O(3) biomonitoring in the sub-tropics. Four field experiments (one in each season of 2006) were carried out in a location of the city of São Paulo mainly polluted by O(3). Each experiment started with 50 plants, and lasted 28 days. Sub-lots of five plants were taken at intervals between three or four days long. Groups of four plants were also exposed in closed chambers to filtered air or to 40, 50 or 80 ppb of O(3) for three consecutive hours a day for six days. The percentage of leaf injury (interveinal chloroses and necroses), the concentrations of ascorbic acid (AA) and the activity of superoxide dismutase (SOD) and peroxidases (POD) were determined in the 5th, 6th and 7th oldest leaves on the main stem of the plants taken in all experiments. Visible injury occurred in the plants from all experiments. Seasonality in the antioxidant responses observed in plants grown under field conditions was associated with meteorological variables and ozone concentrations five days before leaf analyses. The highest levels of antioxidants occurred during the spring. The percentage of leaf injury was explained (R(2) = 0.97, p < 0.01) by the reduction in the levels of AA and activity of POD five days before the leaf analyses and by the reduction in the levels of particulate matter, and enhancement of temperature and global radiation 10 days before this same day. Although I. nil may be employed for qualitative O(3) biomonitoring, its efficiency for quantitative biomonitoring in the sub-tropics may be compromised, depending on how intense the oxidative power of the environment is.

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Section: Discussionmentioning

confidence: 99%

Critical analysis of the potential of Ipomoea nil ‘Scarlet O'Hara’ for ozone biomonitoring in the sub-tropics

et al. 2012

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“…Deforestation has implied substantial environmental changes (Davidson et al., 2012) and forest disturbance (Bullock et al., 2020), such as water stress due to shallower roots (Huete et al., 2006) that causes an energy imbalance, loss of biodiversity, changes to carbon storage (Huete et al., 2006) and an overall decrease in BVOC emissions due to the loss of biomass (Scott et al., 2018). Biomass burning also profoundly affects the oxidation pathways of BVOCs and increases emissions of air pollutants (Bulbovas et al., 2014) by clearing land mainly for soy production (Bulbovas, de Souza, de Moraes, Luizão, & Artaxo, 2007), oil palm production (Jardine, Gimenez, et al, 2016) and cattle ranching (Figure 5). Soy crops are very sensitive to tropospheric ozone (Bulbovas et al., 2007), so higher ozone mixing ratios will feed back to more deforestation to counteract decreased soy productivity (Pimentel, 2011).…”

Section: Climate Change Land‐use Change and Feedbacksmentioning

confidence: 99%

“…Biomass burning also profoundly affects the oxidation pathways of BVOCs and increases emissions of air pollutants (Bulbovas et al., 2014) by clearing land mainly for soy production (Bulbovas, de Souza, de Moraes, Luizão, & Artaxo, 2007), oil palm production (Jardine, Gimenez, et al, 2016) and cattle ranching (Figure 5). Soy crops are very sensitive to tropospheric ozone (Bulbovas et al., 2007), so higher ozone mixing ratios will feed back to more deforestation to counteract decreased soy productivity (Pimentel, 2011).…”

Section: Climate Change Land‐use Change and Feedbacksmentioning

confidence: 99%

Amazonian biogenic volatile organic compounds under global change

Yáñez‐Serrano

Bourtsoukidis

Alves

et al. 2020

Global Change Biology

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Biogenic volatile organic compounds (BVOCs) play important roles at cellular, foliar, ecosystem and atmospheric levels. The Amazonian rainforest represents one of the major global sources of BVOCs, so its study is essential for understanding BVOC dynamics. It also provides insights into the role of such large and biodiverse forest ecosystem in regional and global atmospheric chemistry and climate. We review the current information on Amazonian BVOCs and identify future research priorities exploring biogenic emissions and drivers, ecological interactions, atmospheric impacts, depositional processes and modifications to BVOC dynamics due to changes in climate and land cover. A feedback loop between Amazonian BVOCs and the trends of climate and land-use changes in Amazonia is then constructed. Satellite observations and model simulation time series demonstrate the validity of the proposed loop showing a combined effect of climate change and deforestation on BVOC emission in Amazonia. A decreasing trend of isoprene during the wet season, most likely due to forest biomass loss, and an increasing trend of the sesquiterpene to isoprene ratio during the dry season suggest increasing temperature stress-induced emissions due to climate change. K E Y W O R D S air chemistry, Amazonia, biogenic volatile organic compounds, climate, depositional processes, ecological interactions, global change, land cover, land use | 4723 YÁÑEZ-SERRANO Et Al.

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“…[27][28][29][30][31] A complexa interação destas forças tem produzido um padrão de atividades econômicas que tem sido responsável por emissões de gases e partículas de aerossóis para a atmosfera, através da queima de biomassa em áreas de pastagem, cerrado e florestas primárias. 32,33 A identificação da influência humana na alteração do clima é um dos principais aspectos analisados pelo IPCC-TAR de 2001. 34 A queima de biomassa em florestas tropicais é um dos exemplos de pressão humana com alterações significativas de perdas ambientais, ou seja, perdas de oportunidades para o uso sustentável.…”

Section: Mudanças De Uso Do Solo E Alterações Climáticaso Exemplo Do ...unclassified

Mudanças climáticas e ambientais e as doenças infecciosas: cenários e incertezas para o Brasil

Barcellos

Monteiro

Corvalán³

et al. 2009

Epidemiol. Serv. Saúde

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O processo de mudanças climáticas e ambientais globais, que vem se agravando nas últimas décadas mas que foi divulgado mais amplamente pela mídia nos últimos dois anos, porta para a sociedade e setores de governo um desafio sobre as causas e o papel das alterações ambientais sobre as condições de saúde. Esse trabalho tem como objetivo avaliar cenários de mudanças climáticas e ambientais e suas incertezas para o Brasil. Além disso identifica recursos que podem ser utilizados para desenvolver uma rede de diagnóstico, modelagem, análise e intervenção sobre as repercussões dessas mudanças sobre as condições de saúde. Os principais grupos de doenças que podem ser afetados por essas mudanças são as doenças de veiculação hídrica, as transmitidas por vetores e as respiratórias. No entanto, os riscos associados às mudanças climáticas globais não podem ser avaliados em separado do contexto globalização, mudanças ambientais e precarização de sistemas de governo. Cabe ao setor saúde, não só prevenir esses riscos, mas atuar na redução de suas vulnerabilidades sociais.Palavras-chave: mudanças globais; vigilância ambiental em saúde; vigilância epidemiológica; modelos preditivos.

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Plântulas de soja 'Tracajá' expostas ao ozônio sob condições controladas

Cited by 9 publications

References 27 publications

Critical analysis of the potential of Ipomoea nil ‘Scarlet O'Hara’ for ozone biomonitoring in the sub-tropics

Critical analysis of the potential of Ipomoea nil ‘Scarlet O'Hara’ for ozone biomonitoring in the sub-tropics

Amazonian biogenic volatile organic compounds under global change

Mudanças climáticas e ambientais e as doenças infecciosas: cenários e incertezas para o Brasil

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