Ozone Injury in Soybeans

Keen, N. T.; Taylor, O. C.

doi:10.1104/pp.55.4.731

Cited by 61 publications

(18 citation statements)

References 8 publications

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“…Accumulations of isoflavonoids in ozone-treated plants were observed and tbe suggestion made tbat under stress conditions plants can trigger sucb metabolic responses (Keen & Taylor, 1975). The concentration of 4',7'-dibydroxyfiavone increased witb increasing symptoms of visible injury (Hurwitz, Pell & Sherwood, 1979).…”

Section: Discussionmentioning

confidence: 97%

Accumulation of phenolic compounds in the necrotic areas of Austrian and red pine needles after spraying with sulphuric acid: a possible bioindicator of air pollution

Zobel

Nighswander

1991

New Phytologist

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SUMMARYAustrian pine {Pimis nigra Arn.) and red pine {P. resijwso Ait.) were tested for needle damage caused hy sulphuric acid spray. Morphology and histology of newly grown needles were compared in 3-and 6-yr-old plants growing in the greenhouse under controlled conditions. Potted plants covered with plastic hags were sprayed daily either with distilled H^O or sulphuric acid of pH 2-5, 3-5 and 45. Needle tips, mid-parts and bases were fixed after 1, 3 and 24 h, and' 3, 7 and 30 d in glutaraldehyde-^0-1 % catTeine for intracellular precipitation of phenolics. Histoehemical reactions and electron microscopic observations showed that the morphological damage is linked to increased deposition of phenolic compounds in mesophyll cells, beginning directly under the stomata. Disorganization of membranes leads to death of the mesophyll cells, even before morphological damage i.s recognizable as brown spots on the needle surface. Thus the histoehemical reactions and observations of cell structure revealed damage earlier than macroscopic observations.

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Section: Discussionmentioning

confidence: 97%

Accumulation of phenolic compounds in the necrotic areas of Austrian and red pine needles after spraying with sulphuric acid: a possible bioindicator of air pollution

Zobel

Nighswander

1991

New Phytologist

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“…Alterações no conteúdo de alguns polifenóis, como p-hidróxi-acetofenona, piceína (Figura 8c) e 3-O-glicosil-kaempferol foram observados nas folhas de abeto (Picea abies), porém resultados conflitantes foram obtidos 148,149 . A fumigação das folhas de soja (Glycine max) com O 3 (de 0,25 a 1 μL L -1 por 3 h), paralelamente aos danos foliares, levou a um maior acúmulo dos isoflavonóides cumestrol (Figura 8a), daidzeína (Figura 8b) e sojagol; NO 2 e SO 2 também causaram um acúmulo, porém bem menor, destes isoflavonóides 150 .…”

Section: Poluição Atmosféricaunclassified

Plantas medicinais: fatores de influência no conteúdo de metabólitos secundários

Gobbo‐Neto¹,

Lopes²

2007

Quím. Nova

920

364

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. do Café, s/n, 14040-903 Ribeirão Preto -SP, BrasilRecebido em 7/7/05; aceito em 11/4/06; publicado na web em 31/10/06 MEDICINAL PLANTS: FACTORS OF INFLUENCE ON THE CONTENT OF SECONDARY METABOLITES. Since secondary metabolites represent a chemical interface between plants and surrounding environment, their syntheses are frequently affected by environmental conditions. Thus, variations in the total content and/or of the relative proportions of secondary metabolites in plants can take place. We review the main environmental factors that can streamline or alter the production or concentration of secondary metabolites in plants. How seasonality, circadian rhythm, developmental stage and age, temperature, water availability, UV radiation, soil nutrients, altitude, atmospheric composition and tissue damage influence secondary metabolism are discussed.Keywords: variations in secondary metabolites; medicinal plants; chemical ecology. INTRODUÇÃODesde o quarto século a.C. existem relatos de normas para a coleta de plantas medicinais. Os carrascos gregos, por ex., coletavam suas amostras do veneno cicuta (Conium maculatum) pela manhã, quando os níveis de coniina são maiores 1,2 . Variações temporais e espaciais no conteúdo total, bem como as proporções relativas de metabólitos secundários em plantas ocorrem em diferentes níveis (sazonais e diárias; intraplanta, inter-e intraespecífica) e, apesar da existência de um controle genético, a expressão pode sofrer modificações resultantes da interação de processos bioquímicos, fisiológicos, ecológicos e evolutivos 3-7 . De fato, os metabólitos secundários representam uma interface química entre as plantas e o ambiente circundante, portanto, sua síntese é freqüentemente afetada por condições ambientais 8 .Os principais fatores que podem coordenar ou alterar a taxa de produção de metabólitos secundários estão expostos a seguir. Deve ser enfatizado, porém, que os estudos sobre influência destes fatores na produção de metabólitos secundários geralmente têm se limitado a um grupo restrito de espécies, predominantemente ocorrentes em regiões temperadas, muitas das quais são comercialmente importantes e podem ter sofrido fortes pressões seletivas antrópicas visando certas características desejadas. Seu comportamento, portanto, nem sempre é representativo de plantas selvagens ou de outros tipos de habitat.Também deve ser ressaltado que, muitas vezes, as variações podem ser decorrentes do desenvolvimento foliar e/ou surgimento de novos órgãos concomitante a uma constância no conteúdo total de metabólitos secundários. Isto pode levar à menor concentração destes metabólitos por diluição, podendo, no entanto, resultar em maior quantidade total, devido ao aumento de biomassa 9,10 . Além disso, alguns dos fatores discutidos apresentam correlações entre si e não atuam isoladamente, podendo influir em conjunto no metabolismo secundário, como por ex.: desenvolvimento e sazonalidade; índice pluviométrico e sazonalidade; temperatura e altitude, entre outros. FATORES QUE INFLUENCIAM O CONTEÚDO DE M...

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“…These compounds are also thought to be an important part of induced defense systems in response to environmental stresses such as pathogen infection, wounding, and UV exposure (Hahlbrock and Scheel, 1989). Ozone treatment induced isoflavonoid and flavonoid biosynthesis in soybean and pine, respectively (Keen and Taylor, 1975;Rosemann et al, 1991). Activities of PAL and other biosynthetic enzymes of the central phenylpropanoid and flavonoid pathways were shown to be increased by 8 h after ozone exposure in pine (Rosemann et al, 1991).…”

Section: Dlscusslonmentioning

confidence: 99%

Ozone-Induced Expression of Stress-Related Genes in Arabidopsis thaliana

1994

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Ozone is a major gaseous pollutant that is known to have detrimental effects on plant growth and metabolism. We have investigated the effects of ozone on Arabidopsis fhaliana growth and the pattern of expression of several stress-related genes. A. thaliana plants treated with either 150 or 300 parts per billion (ppb) ozone daily for 6 h exhibited reduced growth and leaf curling.Fresh and dry weights of ozone-treated plants were reduced 30 to 48% compared to ambient air controls. RNA blot analyses demonstrated that mRNA levels for glutathione S-transferase (CST), phenylalanine ammonia-lyase (PAL), a neutral peroxidase, and a cytosolic Cu/Zn superoxide dismutase (SOD) were higher in plants treated with 300 ppb ozone than in ambient air-treated controls.The mRNA levels of lipoxygenase and a catalase were not affeded by ozone treatment. Of the transcripts examined, CST mRNA levels increased the most, showing a 26-fold indudion 3 h after the initiation of ozone treatment. PAL mRNA was also rapidly induced, reaching 3-fold higher levels than controls within 3 h of ozone treatment. The neutral peroxidase and SOD mRNA levels rose more slowly, with both reaching maximum levels corresponding to 5-fold and 3-fold induction, respectively, approximately 12 h after ozone treatment. These studies indicate that ozone-induced expression of stress-related genes in A. fhaliana provides an excellent model system for investigating the molecular and genetic basis of ozone-induced responses in plants.

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Ozone Injury in Soybeans

Cited by 61 publications

References 8 publications

Accumulation of phenolic compounds in the necrotic areas of Austrian and red pine needles after spraying with sulphuric acid: a possible bioindicator of air pollution

Accumulation of phenolic compounds in the necrotic areas of Austrian and red pine needles after spraying with sulphuric acid: a possible bioindicator of air pollution

Plantas medicinais: fatores de influência no conteúdo de metabólitos secundários

Ozone-Induced Expression of Stress-Related Genes in Arabidopsis thaliana

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