Responses of gas exchange, cellular membrane integrity, and antioxidant enzymes activities of salinity-stressed winter wheat to ozone pollution

Zheng, Yu; Li, Y. G.; Xia, Wen; Xu, He; Su, Ben-Ying; Jiang, Gaoming; Ning, Tangyuan

doi:10.1007/s11099-011-0047-6

Cited by 9 publications

(3 citation statements)

References 36 publications

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“…However, chloroplasts in the drought-tolerant lines remained more intact during the drought period. As the light reactions of photosynthesis occur in the grana, a close relationship is expected between membrane integrity and photosynthetic activity (Bonini et al 2007, Zheng et al 2011. It should also be noted that drought exposure changed the shape of many chloroplasts from lenticular to round or oval, suggesting that an altered function would also have occurred.…”

Section: Discussionmentioning

confidence: 99%

Changes in chloroplast ultrastructure in leaves of drought-stressed maize inbred lines

Shao¹,

Xin²,

Zheng³

et al. 2016

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Chloroplasts are commonly the site of the earliest abiotic injury visible in plant ultrastructure. In this study, six inbred lines of maize (Zea mays L.) were used to analyze changes in the ultrastructure of chloroplasts and related physiological parameters under conditions of drought stress simulated by 20% polyethylene glycol 6000 (-0.6 MPa) for three days. Chloroplasts of three maize lines proved to be more sensitive. They showed changes in ultrastructure in response to drought, including damage to thylakoid membranes, an increase in the number and size of plastoglobuli, swelling of thylakoid membranes both stromal and granal, disorganization of the thylakoid membrane system, an obvious increase in the intrathylakoid space, and a decrease in the length-to-width ratio and area of chloroplasts. In addition, the contents of malondialdehyde increased markedly in the sensitive lines. Contrary to the sensitive lines, stable structures and shapes in chloroplasts were observed in the drought-resistant lines; it could be considered as an advantage contributing to drought tolerance in the plants. In addition, the drought index of leaf fresh mass (LMDI) in drought-sensitive lines was ≤ 0.5, which was also associated with a lower content of leaf chlorophyll. In contrast, drought tolerance coincided with lesser growth reduction, and higher LMDI and leaf chlorophyll content.

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Section: Discussionmentioning

confidence: 99%

Changes in chloroplast ultrastructure in leaves of drought-stressed maize inbred lines

Shao¹,

Xin²,

Zheng³

et al. 2016

Photosynt.

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“…These compounds impair the ability of the cellular membrane to function by inducing lipid peroxidation (Zheng et al . ), through lipid oxidase or a membrane lipase to produce jasmonic acid or inositol triphosphate. Jasmonic acid and inositol triphosphate act at the systematic acquired resistance level to change the production of defence gene products.…”

Section: Physiological Effectsmentioning

confidence: 99%

Ozone effects on plants in natural ecosystems

2019

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Tropospheric ozone (O 3 ) is an important stressor in natural ecosystems, with welldocumented impacts on soils, biota and ecological processes. The effects of O 3 on individual plants and processes scale up through the ecosystem through effects on carbon, nutrient and hydrologic dynamics. Ozone effects on individual species and their associated microflora and fauna cascade through the ecosystem to the landscape level. Systematic injury surveys demonstrate that foliar injury occurs on sensitive species throughout the globe. However, deleterious impacts on plant carbon, water and nutrient balance can also occur without visible injury. Because sensitivity to O 3 may follow coarse physiognomic plant classes (in general, herbaceous crops are more sensitive than deciduous woody plants, grasses and conifers), the task still remains to use stomatal O 3 uptake to assess class and species' sensitivity. Investigations of the radial growth of mature trees, in combination with data from many controlled studies with seedlings, suggest that ambient O 3 reduces growth of mature trees in some locations. Models based on tree physiology and forest stand dynamics suggest that modest effects of O 3 on growth may accumulate over time, other stresses (prolonged drought, excess nitrogen deposition) may exacerbate the direct effects of O 3 on tree growth, and competitive interactions among species may be altered. Ozone exposure over decades may be altering the species composition of forests currently, and as fossil fuel combustion products generate more O 3 than deteriorates in the atmosphere, into the future as well.

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“…Several studies reveal that increased salinity level enhances the activities of both enzymatic and nonenzymatic antioxidants in plants (Ghosh et al 2011, Hasanuzzaman et al 2011. Moreover, Zheng et al (2011) found that the combined effects of O3 and salinity increased antioxidant enzyme activity significantly only in the salt-sensitive wheat cultivar and projected a complementary defense for both stresses. Still, there is uncertainty about the antioxidant defense mechanisms under O3 and salinity stress.…”

Section: Introductionmentioning

confidence: 99%

Mitigation mechanism of ozone-induced reduction in net photosynthesis of Bangladeshi wheat under soil salinity stress

Kamal¹,

Yamaguchi²,

Kinose³

et al. 2019

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To clarify the combined effects of O3 and soil salinity on net photosynthetic rate, stomatal conductance, and radical scavenging system of Bangladeshi spring wheat cv. BAW1059, plants were grown in two soil salinity levels (irrigated with 0 and 150 mM NaCl solutions) and exposed to three O3 concentrations [charcoal-filtered air (CF), 1.0-fold the ambient O3 concentration (1.0×O3), and 1.5-fold the ambient O3 concentration (1.5×O3)]. The soil salinity mitigated adverse effects of O3 on net photosynthesis in the 7 th and flag leaves. The soil salinity did not induce stomatal closure, indicating no limitation of stomatal O3 uptake. The activities of ascorbate peroxidase and catalase were stimulated by the soil salinity in the 7 th and flag leaves, especially under 1.5×O3 concentration. In the flag leaf, the soil salinity induced a significant increase in dehydroascorbate reductase activity and ascorbate concentration. These results suggest that the soil salinity activated detoxification capacity related to mitigation of O3 damage on net photosynthesis in both 7 th and flag leaves, while the activated enzymes and antioxidants were different between the leaves.

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Responses of gas exchange, cellular membrane integrity, and antioxidant enzymes activities of salinity-stressed winter wheat to ozone pollution

Cited by 9 publications

References 36 publications

Changes in chloroplast ultrastructure in leaves of drought-stressed maize inbred lines

Changes in chloroplast ultrastructure in leaves of drought-stressed maize inbred lines

Ozone effects on plants in natural ecosystems

Mitigation mechanism of ozone-induced reduction in net photosynthesis of Bangladeshi wheat under soil salinity stress

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