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Impact of hydropower dam development on river ecosystems: ecopath model application on the Red river in China as an example

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Wang X.-X., Peng L., Su C.-J., Cheng W.-G.

Polish Journal of Environmental Studies

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2017

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tom 26

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nr 6

In order to reveal the influence of hydropower development on river ecology, we selected a number of research sites, including a natural channel (NC), a channel reservoir (CR), and a channel below the dam (CB) of a certain dam-type hydropower station on the Red River in China. We used the Ecopath model to analyze the differences in structures and energy characteristics of the three ecosystems. As indicated from the results, the energy flow in the three ecosystems of NC, CR, and CB mainly flows between trophic levels I and IV, and the overall transfer efficiencies of the three ecosystems are characterized by CR < NC < CB. The output of primary producers in the three ecosystems are, respectively, 852 t·km⁻²·y⁻¹, 3780 t·km⁻²·y⁻¹, and 1842.3 t·km⁻²·y⁻¹, and the recycling flows into the detritus are 49.37%, 48.46%, and 79.79% respectively. There are two major trophic transfer paths in the three ecosystem food webs, namely the detrital food chain and the grazing food chain. Through the comparison and analysis of the overall characteristics of the system, we found that the indicators reflecting system maturity – including total primary production/total respiration (TPP/TR), connectance index (CI), system omnivory index (SOI), Finn’s cycling index (FCI), and Finn’s mean path length (FML) – indicate that the maturity of the ecosystem of CB is lower than that of NC, and is much lower than that of CR. The results show that the ecosystems of CR, NC, and CB, respectively, are in basically mature, immature, and unstable “young” states. This trophic model analysis also provides a new research perspective on the studies of the influence of hydropower development on riverine ecology.

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Model of eco-water driving force affecting the evolvement of runoff in the upper Minjiang river basin

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Huang J., Yang W., Peng L., Ashraf M. A.

Polish Maritime Research

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2016

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tom 23

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nr Special Issue S1

The amount of eco-water resources reflects the land surface water conservation capability, and the underlying surface condition in the hydrologic cycle. In the upper Minjiang River Basin, the amounts of eco-water resources were retrieved from remotely sensed data during 1992 to 2005. Through regression analysis between the retrieved eco-water data and the climate hydrological data mainly including the temperature, the precipitation, and the runoff in the same period, the model of eco-water driving force affecting the evolvement of runoff was established. The accuracy analysis indicates that the model can well describe the relationship between dry season runoff and its driven factors, the measured data validation proves that the model has high precision and good practicability. The eco-water remote sensing inversion provides a valid method to quantify the land surface water conservation capability, and suggests an interesting approach for the driving function quantitative researches of underlying surface factor in the hydrologic cycle

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Cloning and expression of a tau class glutathione S -transferase (ZjGSTU1 ) from Chinese jujube in response to phytoplasma infection

88%

Peng L., Zhao Y., Zhao Z., Zhao J., Liu M.

Acta Physiologiae Plantarum

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2014

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tom 36

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nr 11

Phytoplasmas are associated with diseases of several hundred plant species. Jujube witches’ broom disease (JWB) is a destructive phytoplasma disease in Chinese jujube (Ziziphus jujuba Mill.). Ziziphus jujuba Mill. ‘J5’, an excellent strain with extremely high resistance to JWB, was selected by us. In our previous study, a GST (EC 2.5.1.18) fragment was sequenced from suppression subtractive hybridization library of ‘J5’ under JWB phytoplasma stress. Based on this result, a GST gene (ZjGSTU1, HM345954) was first isolated from jujube by homology cloning and RACE. ZjGSTU1 contains a complete open reading frame of 702 bp encoding a protein of 233 amino acid residues. Sequence alignment showed that ZjGSTU1 shared a typical conserved structure and high identity with tau GSTs from other plant species. Relative RT-PCR demonstrated that the expression of ZjGSTU1 mRNA in jujube leaves and branches could be triggered by JWB phytoplasma. Moreover, the expression of ZjGSTU1 mRNA in resistant strain ‘J5’ increased sooner and higher than that in sensitive strain ‘J9’ under JWB phytoplasma stress (‘J5’ and ‘J9’ are two strains from the same cultivar). Western blotting analyses showed that the expressions of ZjGSTU1 in ‘J5’ and ‘J9’ were dramatically up-regulated under JWB phytoplasma stress and its expression in ‘J5’ was also higher than that in ‘J9’ at protein level. Collectively, this paper highlights that ZjGSTU1 gene is responsive to phytoplasma infection. The possible roles of this gene were discussed in terms of regulatory process in resistance to phytoplasma infection.

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Effects of organic cultivation pattern on tomato production: plant growth characteristics, quality, disease resistance, and soil physical and chemical properties

64%

Feng X., Xu Y., Liu D., Peng L., Dong J., Yao S., Feng Y., Feng Z., Li F., Hu B.

Acta Scientiarum Polonorum. Hortorum Cultus

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2020

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tom 19

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nr 1

Tomato (Solanum lycopersicum L.) is one of the world’s most important cultivated vegetable. In the traditional cultivation methods, the excessive use of pesticides and fertilizers leads to an imbalance of nutrient elements in the soil, an increase in pests and diseases and a decrease in vegetable quality and yield. In the face of increasingly serious environmental and food problems, organic agriculture is considered to be an effective solution. In this experiment, the effects of organic cultivation patterns on the growth, quality, disease resistance in tomatoes, and the physical and chemical properties of soil were studied by different treatments. The results showed that the application of effective microorganisms (EM) bio-organic fertilizer in the cultivation process can significantly improve the yield, quality, and antioxidant enzyme activity of tomato. The use of straw mulching was found to significantly increase the growth, chlorophyll content, transpiration rate, and soluble sugar content of tomatoes. The application of EM bio-organic fertilizer or straw mulching significantly increased the activity of antioxidant enzyme and the expression of LeCHI gene in tomato leaves and enhanced tomato resistance to diseases. Organic production practices were found to significantly improve the soil.

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Lycium barbarum polysaccharide protects HSF cells against ultraviolet-induced damage through the activation of Nrf2

64%

Liang B., Peng L., Li R., Li H., Mo Z., Dai X., Jiang N., Liu Q., Li Z., Zhu H.

Cellular and Molecular Biology Letters

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2018

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tom 23

Background: Lycium barbarum polysaccharide (LBP) is considered an antioxidant agent. NF-E2-related factor-2 (Nrf2) is an important regulator for protection against UV damage. In this study, we verified the performance of LBP and the correlation between LBP and Nrf2. Methods: HSF cells were treated with LBP to determine dose and time dependencies. An antioxidant response element (ARE) reporter was designed to monitor the activity of the Nrf2 antioxidant pathway. Results: For HSF cells, the optimal LBP treatment was 300 μg/ml for 3 h. The AREreporter assay showed that LBP could increase the robustness of p-Nrf2. Treatments with genistein and LY294002 reduced of nuclear p-Nrf2 after 24 h. LBP increased the level of nuclear Nrf2, which functions by both phosphorylation and nuclear translocation. Silencing Nrf2 led to increased reactive oxygen species (ROS) levels, lower cell viability, and decreased superoxide dismutase (SOD) and glutathione peroxidase (GSP-PX) levels. This induced a higher level of lipid peroxide (LPO). However, LBP could decrease the levels of ROS and LPO and enhance the levels of SOD and GSP-PX. Conclusion: LBP protects HSF cells against UV damage via the regulation of Nrf2.

Ograniczanie wyników

Impact of hydropower dam development on river ecosystems: ecopath model application on the Red river in China as an example

Model of eco-water driving force affecting the evolvement of runoff in the upper Minjiang river basin

Cloning and expression of a tau class glutathione S -transferase (ZjGSTU1 ) from Chinese jujube in response to phytoplasma infection

Effects of organic cultivation pattern on tomato production: plant growth characteristics, quality, disease resistance, and soil physical and chemical properties

Lycium barbarum polysaccharide protects HSF cells against ultraviolet-induced damage through the activation of Nrf2