Ethylene‐promoted ascorbate peroxidase activity protects plants against hydrogen peroxide, ozone and paraquat

Mehlhorn, H.

doi:10.1111/j.1365-3040.1990.tb01988.x

Cited by 131 publications

(64 citation statements)

References 31 publications

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“…These secondary stressors were suggested to be, in part, H 2 O 2 , HMHP, and other hydroperoxides that are produced as part of alkene ozonolysis (46). It should be noted that both H 2 O 2 and O 3 may elicit beneficial defense reactions in plants below their relative phytotoxic limits (75,76), and the physiological effects are tightly coupled. Thus, it may be useful to consider the total activated oxygen flux as the sum of ozone and peroxides.…”

Section: Resultsmentioning

confidence: 99%

Rapid deposition of oxidized biogenic compounds to a temperate forest

Nguyen

Crounse

Teng

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

242

433

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We report fluxes and dry deposition velocities for 16 atmospheric compounds above a southeastern United States forest, including: hydrogen peroxide (H 2 O 2 ), nitric acid (HNO 3 ), hydrogen cyanide (HCN), hydroxymethyl hydroperoxide, peroxyacetic acid, organic hydroxy nitrates, and other multifunctional species derived from the oxidation of isoprene and monoterpenes. The data suggest that dry deposition is the dominant daytime sink for small, saturated oxygenates. Greater than 6 wt %C emitted as isoprene by the forest was returned by dry deposition of its oxidized products. Peroxides account for a large fraction of the oxidant flux, possibly eclipsing ozone in more pristine regions. The measured organic nitrates comprise a sizable portion (15%) of the oxidized nitrogen input into the canopy, with HNO 3 making up the balance. We observe that water-soluble compounds (e.g., strong acids and hydroperoxides) deposit with low surface resistance whereas compounds with moderate solubility (e.g., organic nitrates and hydroxycarbonyls) or poor solubility (e.g., HCN) exhibited reduced uptake at the surface of plants. To first order, the relative deposition velocities of water-soluble compounds are constrained by their molecular diffusivity. From resistance modeling, we infer a substantial emission flux of formic acid at the canopy level (∼1 nmol m −2 ·s −1 ). GEOS−Chem, a widely used atmospheric chemical transport model, currently underestimates dry deposition for most molecules studied in this work. Reconciling GEOS−Chem deposition velocities with observations resulted in up to a 45% decrease in the simulated surface concentration of trace gases.biosphere−atmosphere exchange | isoprene | dry deposition | OVOCs | fluxes

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Section: Resultsmentioning

confidence: 99%

Rapid deposition of oxidized biogenic compounds to a temperate forest

Nguyen

Crounse

Teng

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

242

433

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“…therein). Similarly, a coordinated increase in glutathione reductase and ascorbate peroxidase activities was observed in response to ozone stress (Mehlhorn, 1990). In soybea n, ozone-induced peroxidase activity inc reased more rapidly in a cultivar highly sensitive to ozonv, leading to suggesiions that peroxidase activity changes were important in determining differential sensitivity (Tingy et al, 1976).…”

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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“…High CO 2 may stimulate the oxidation of AA, probably by ascorbate peroxidase. Mehlhorn (1990) demonstrated an increase in ascorbate peroxidase activity in response to ethylene. High CO 2 at injurious concentrations for the commodity may reduce AA by increasing ethylene production and, thus, the activity of ascorbate peroxidase.…”

Section: Storagementioning

confidence: 99%

Preharvest and postharvest factors influencing vitamin C content of horticultural crops

Lee

Kader

2000

Postharvest Biology and Technology

1,867

117

1,088

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Vitamin C, including ascorbic acid and dehydroascorbic acid, is one of the most important nutritional quality factors in many horticultural crops and has many biological activities in the human body. The content of vitamin C in fruits and vegetables can be influenced by various factors such as genotypic differences, preharvest climatic conditions and cultural practices, maturity and harvesting methods, and postharvest handling procedures. The higher the intensity of light during the growing season, the greater is vitamin C content in plant tissues. Nitrogen fertilizers at high rates tend to decrease the vitamin C content in many fruits and vegetables. Vitamin C content of many crops can be increased with less frequent irrigation. Temperature management after harvest is the most important factor to maintain vitamin C of fruits and vegetables; losses are accelerated at higher temperatures and with longer storage durations. However, some chilling sensitive crops show more losses in vitamin C at lower temperatures. Conditions favorable to water loss after harvest result in a rapid loss of vitamin C especially in leafy vegetables. The retention of vitamin C is lowered by bruising, and other mechanical injuries, and by excessive trimming. Irradiation at low doses (1 kGy or lower) has no significant effects on vitamin C content of fruits and vegetables. The loss of vitamin C after harvest can be reduced by storing fruits and vegetables in reduced O 2 and/or up to 10% CO 2 atmospheres; higher CO 2 levels can accelerate vitamin C loss. Vitamin C of produce is also subject to degradation during processing and cooking. Electromagnetic energy seems to have advantages over conventional heating by reduction of process times, energy, and water usage. Blanching reduces the vitamin C content during processing, but limits further decreases during the frozen-storage of horticultural products.

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Ethylene‐promoted ascorbate peroxidase activity protects plants against hydrogen peroxide, ozone and paraquat

Cited by 131 publications

References 31 publications

Rapid deposition of oxidized biogenic compounds to a temperate forest

Rapid deposition of oxidized biogenic compounds to a temperate forest

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

Preharvest and postharvest factors influencing vitamin C content of horticultural crops

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