SULPHUR DIOXIDE METABOLISM IN SOY‐BEAN, <i>GLYCINE MAX</i> VAR. BILOXI

Garsed, S. G.; Read, David

doi:10.1111/j.1469-8137.1977.tb01549.x

Cited by 41 publications

(14 citation statements)

References 8 publications

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“…A aplicação foliar de 35 S resultou em pronta absorção e rápida translocação do radioisótopo para todas as partes da planta (Tabela 3). Resultados semelhantes foram obtidos por Garsed & Read (1977a, 1977b ao aplicarem 35 SO 2 à primeira folha trifoliada de plantas de soja.…”

Section: Resultsunclassified

“…Dessa for- B A ma, uma fração em torno de 98% do 35 S foi mantida nas folhas de milho e de soja tratadas com a solução marcada (Tabela 3). Resultados semelhantes foram obtidos por Garsed & Read (1977a).…”

Section: Resultsunclassified

“…A aplicação de 35 S-cisteína na folha de espécies arbóreas resultou em uma exportação de 0,3% a 1,2% do 35 S para outras partes da planta em Fagus sylvatica (Herschbach & Rennenberg, 1995) e de 54% a 77% em Piceas abies (Schneider et al, 1994). Em plantas de soja, a absorção, a assimilação e a redistribuição de S se processam com bastante rapidez, uma vez que se detectou sulfato marcado na solução nutritiva uma hora após a exposição das folhas ao 35 SO 2 (Garsed & Read, 1977a). O sulfato foi o principal composto marcado transportado no floema, seguido por menores quantidades de glutationa e cisteína (Garsed & Read, 1977b).…”

Section: Introductionunclassified

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Translocação e redistribuição de enxofre em plantas de milho e de soja

Silva

Venegas²,

Ruíz³

et al. 2003

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi estudar a translocação e a redistribuição de S pelo transporte acrópeto e basípeto em plantas de milho e de soja. Plantas das duas espécies foram cultivadas em solução nutritiva contendo 35 S em casa de vegetação. O 35 S aplicado em uma única raiz foi prontamente absorvido e translocado para a parte aérea, assim como para as demais raízes cultivadas na ausência de enxofre. O radioisótopo aplicado em uma única folha foi transportado tanto na direção acrópeta quanto na basípeta. Entretanto, o milho e a soja mostraram comportamentos diferentes na absorção e na redistribuição do enxofre. O milho, apesar de ter apresentado maior absorção radicular, reteve grande parte desse elemento na raiz, enquanto a soja absorveu consideravelmente menos, porém apresentou maior eficiência de translocação. Nas plantas de soja, as folhas superiores, principalmente as mais novas, mostraram ser os principais drenos fisiológicos do enxofre.Termos de indexação: Zea mays, Glycine max, transporte de nutrientes, raiz, absorção. Translocation and redistribution of sulphur in corn and soybean plantsAbstract -The objective of this work was to study the S translocation and redistribution by acropetal and basipetal transport in corn and soybean plants. Plants of both species were cultivated in nutritive solution containing labeled 35 S, in a greenhouse. The 35 S applied to only one root was absorbed quickly and transported to the shoot, as well as to the other roots cultivated in non-labeled solution. The 35 S applied to only one leaf was transported both to acropetal and basipetal direction. However, corn and soybean showed different behaviors in S absorption and redistribution. In spite of having larger root absorption, corn retained great part of that S in the root, while soybean absorbed considerably less, but presented greater translocation efficiency. The upper leaves, mainly the youngest, showed to be the main physiologic sinks for S in soybean plants.

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Section: Resultsunclassified

Section: Introductionunclassified

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Translocação e redistribuição de enxofre em plantas de milho e de soja

Silva

Venegas²,

Ruíz³

et al. 2003

Pesq. agropec. bras.

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“…How do we unravel the role of plant SO? Previous data showed that plants subjected to sulfur-labeled SO 2 gas readily converted the radioactive label into sulfate (12,13), yet the corresponding enzyme catalyzing this reaction was not characterized at that time. Most importantly, this reaction was interpreted as the key step ("safety valve") in protecting plants from acid rain that has been one major cause of forest damage (14).…”

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confidence: 99%

Plant Sulfite Oxidase as Novel Producer of H2O2

Hänsch

Lang

Riebeseel

et al. 2006

Journal of Biological Chemistry

124

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Sulfite oxidase (EC 1.8.3.1) from the plant Arabidopsis thaliana is the smallest eukaryotic molybdenum enzyme consisting of a molybdenum cofactor-binding domain but lacking the heme domain that is known from vertebrate sulfite oxidase. While vertebrate sulfite oxidase is a mitochondrial enzyme with cytochrome c as the physiological electron acceptor, plant sulfite oxidase is localized in peroxisomes and does not react with cytochrome c. Here we describe results that identified oxygen as the terminal electron acceptor for plant sulfite oxidase and hydrogen peroxide as the product of this reaction in addition to sulfate. The latter finding might explain the peroxisomal localization of plant sulfite oxidase. 18 O labeling experiments and the use of catalase provided evidence that plant sulfite oxidase combines its catalytic reaction with a subsequent non-enzymatic step where its reaction product hydrogen peroxide oxidizes another molecule of sulfite. In vitro, for each catalytic cycle plant SO will bring about the oxidation of two molecules of sulfite by one molecule of oxygen. In the plant, sulfite oxidase could be responsible for removing sulfite as a toxic metabolite, which might represent a means to protect the cell against excess of sulfite derived from SO 2 gas in the atmosphere (acid rain) or during the decomposition of sulfur-containing amino acids. Finally we present a model for the metabolic interaction between sulfite and catalase in the peroxisome. Sulfite oxidases (SO)3 from vertebrates (published as EC 1.8.3.1) play an essential role in sulfur detoxification by catalyzing the reaction (1), which is the terminal step in the oxidative degradation of cysteine and methionine. Different electron acceptors were reported to interact with vertebrate SO including cytochrome c, ferricyanide, and oxygen (2-4). In mammals, SO is localized in the intermembrane space of mitochondria (5) where electrons derived from sulfite are passed to cytochrome c, the physiological electron acceptor. Vertebrate SO is a homodimeric protein with monomers subdivided into a Moco domain and a heme domain, as verified by the atomic structure of chicken SO (6).Recently we have described plant SO (7) from Arabidopsis thaliana, which is the fourth molybdenum enzyme present in plants in addition to nitrate reductase, xanthine dehydrogenase, and aldehyde oxidase. Cloning and characterization of plant SO was possible by using sequence homologies to the mammalian counterpart. However, in contrast to the animal enzyme plant SO lacks the heme domain, which is evident from the amino acid sequence, its enzymological and spectral properties (7), and the atomic structure (8). Also its subcellular localization differs from that of animals, in plants we showed SO to be localized in peroxisomes (9). SO is wide spread and highly conserved within the plant kingdom; the SO gene is present in higher and lower plants, and the protein encoded seems to be highly conserved because antibodies directed against Arabidopsis SO detect proteins of the correct size...

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“…1). The stimulation of sulphate uptake by light and its inhibition by darkness or sulphite preincubation indicates that the process is probably energydependent (Garsed & Read, 1977).…”

Section: Experimental Conditionsmentioning

confidence: 99%

Sulphite‐induced changes of sulphur metabolism in the lichen alga Trebouxia sp

Schlee

1992

New Phytologist

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SULPHUR DIOXIDE METABOLISM IN SOY‐BEAN, GLYCINE MAX VAR. BILOXI

Cited by 41 publications

References 8 publications

Translocação e redistribuição de enxofre em plantas de milho e de soja

Translocação e redistribuição de enxofre em plantas de milho e de soja

Plant Sulfite Oxidase as Novel Producer of H2O2

Sulphite‐induced changes of sulphur metabolism in the lichen alga Trebouxia sp

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