Sulfide Inhibition of Oxidases in Rice Roots

Allam, A. I.

doi:10.1094/phyto-62-634

Cited by 154 publications

(88 citation statements)

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“…A decrease in the activity of root metallo-enzymes has been postulated as the phytotoxic effect of HzS (Allam and Hollis 1972;Havill et al 1985;Pearson and Havill 1988) primarily because important oxidalses such as cytochrome oxidase -the terminal enzyme in the electron transport chain of aerobic respiration-are inhibited by sulfide. Wetland macrophytes growing in anoxrc, waterlogged soils, where H,S can accumulate often exhibit anoxic root metabolism., however, which is believed to contribute to energy production (e.g.…”

Section: Discussionmentioning

confidence: 99%

Mechanism for the hydrogen sulfide‐induced growth limitation in wetland macrophytes

Koch

Mendelssohn

McKee

1990

Limnology & Oceanography

303

162

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Hydrogen sulfide, a phytotoxin that often accumulates in anoxic marine and freshwater marsh soils, suppressed the activity of alcohol dehydrogenase (ADH), the enzyme that catalyzes the terminal step in alcoholic fermentation, in the roots of two wetland macrophytes. This inhibition of root ADH activity with increasing sulfide concentration was associated with decreases in root total adenine nucleotide pool (ATP + ADP + AMP), the adenylate energy charge ratio (AEC), nitrogen uptake (percent recovery of rSNH,+-N) and growth (leaf elongation). These responses were species-specific with a greater negative impact in the freshwater marsh species that naturally inhabits low-sulfide environments. These findings lend support to the hypotheses that ADH activity, as a mcasurc of fermcntative metabolism, is important in maintaining the root energy status of wetland plants under hypoxic-anoxic conditions, that there is a significant negative effect of H,S on the anoxic production of energy in these roots, and that an important negative effect of H,S on plant growth is an inhibition of the energy-dependent process of N uptake.

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Section: Discussionmentioning

confidence: 99%

Mechanism for the hydrogen sulfide‐induced growth limitation in wetland macrophytes

Koch

Mendelssohn

McKee

1990

Limnology & Oceanography

303

162

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“…The absence of O2 in the plants may lead to accumulations of H2S, thereby poisoning plant respiration. The concentration of H2S in the top 2 cm at these sites in summer is about 1 mM (Howes et al 1985)-a thousand times that which inhibits respiration in rice (Allam and Hollis 1972).…”

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confidence: 90%

Carbon flow through oxygen and sulfate reduction pathways in salt marsh sediments1

Howes

Dacey

King

1984

Limnology & Oceanography

170

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We measured surface 0, uptake, 35S0.,2-reduction, and total sediment metabolism (CO, production) in sediments (O-30 cm) supporting stands of short Spartina alterniflora in a New England salt marsh. Sediment CO, production was highest at the surface where 0, was present and declined rapidly with depth. In deeper sediments (below 5 cm) CO, production was equal to 35S0,2-reduction as determined by the Cr2+ reduction technique. Time-course experiments using CO, production and 35S04?-reduction (by Cr2+ reduction and aqua regia digest) indicate that the aqua regia technique is not reliable for measuring SOd2-reduction and that the rate ofSOd2-reduction is much less than previously reported for this marsh.Our estimates of annual 0, uptake conform with those for CO, production and belowground production. We estimate carbon mineralization to average about 180 mmol C.m-2.d-1, among the highest measured for marine sediments. Our simultaneous measurements of 0, uptake, CO2 production, and SOd2-reduction suggest that at least half of this decomposition occurs via SOd2-reduction. We conclude that the mechanisms underlying carbon and sulfur cycling in salt marsh sediments are much more similar to subtidal sediments than previously recognized.

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“…Peroxidase enzyme activity was determined according to the method described by Allam and Hollis (1972) and Srivastava (1987) by measuring the oxidation of pyrogallol to pyrogallin in presence of H 2 O 2 . Peroxidase activity was expressed as changes in absorbance (optical density per 1 min/0.5g sample, OD/min/0.5g).…”

Section: Peroxidase (Pox) Assaymentioning

confidence: 99%

Incidence of kernel smut caused by Tilletia barclayana in Egyptian rice cultivars

El-Kazzaz¹,

El-Kot²,

Ghoneim³

et al. 2014

Afr. J. Microbiol. Res.

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Sulfide Inhibition of Oxidases in Rice Roots

Cited by 154 publications

References 0 publications

Mechanism for the hydrogen sulfide‐induced growth limitation in wetland macrophytes

Mechanism for the hydrogen sulfide‐induced growth limitation in wetland macrophytes

Carbon flow through oxygen and sulfate reduction pathways in salt marsh sediments1

Incidence of kernel smut caused by Tilletia barclayana in Egyptian rice cultivars

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