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1

Effects of three phenolic compounds on mitochondrial function and root vigor of cotton (Gossypium hirsutum L.) seedling roots

100%
Zhang G., Yang C., Liu R., Ni W.
Acta Physiologiae Plantarum
|
2019
|
tom 41
|
nr 05
Continuous cropping of cotton causes accumulation of allelochemicals in soil that results in substantial crop yield and quality losses. To elucidate the physiological mechanism of the effects of allelochemicals on cotton root growth, and solve the problem of continuous cropping obstacles, hydroponics experiments were carried out to study the effects of three allelochemicals (p-hydroxybenzoic acid (PHBA), phloroglucinol, and ferulic acid) at different concentrations (0.8, 4.0, and 20.0 mmol L⁻¹) on the production of reactive oxygen species, antioxidant enzyme activities, and mitochondrial function of cotton seedling roots. All three phenolic compounds suppressed cotton root growth, decreased the activity of antioxidant enzymes (superoxide dismutase, catalase and peroxidase) and H⁺-ATPase in root mitochondria, and increased generation of O₂⁻ and the content of H₂O₂. They also increased the degree of openness of mitochondria permeability transition pores, and decreased the membrane fluidity of mitochondria, and the ratio of cytochrome (Cyt) c/a, thus resulting in the damage of mitochondrial structure and overall function of the root system. Ferulic acid at 20.0 mmol L⁻¹ inhibited cotton root growth more than the other treatments. Above all, all three kinds of allelochemicals inhibited antioxidant enzyme activity and mitochondrial function in cotton seedling roots, and the inhibition depended on the dose of phenolic compounds. Compared to PHBA and phloroglucinol, ferulic acid was a stronger inhibitor of cotton seedling root growth.
2
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Bryophyte diversity in karst sinkholes afected by diferent degrees of human disturbance

100%
Liu R., Zhang Z., Shen J., Wang Z.
Acta Societatis Botanicorum Poloniae
|
2019
|
tom 88
|
nr 2
3

Production of isoflavone genistein in transgenic IFS tobacco roots and its role in stimulating the developmnet of arbuscular mycorrhiza

100%
Tan Z., Liu R., Hu Y., Lin Z.
Acta Physiologiae Plantarum
|
2012
|
tom 34
|
nr 5
Flavonoids and isoflavonoids are secondary metabolites in plants. With the goal of obtaining isoflavonoids from a wide range of plants, a few key studies have proven that isoflavonoids can be produced in non-leguminous plants by transgenic engineering. Many earlier studies investigate genistein biosynthesis in leaves and petals of isoflavone synthase (IFS) transgenic tobacco. However, most reports do not attempt to analyze quantification of genistein or do not check the presence of genistein in transgenic plant roots. In addition, little is known about the influence of genistein on arbuscular mycorrhiza (AM). In this paper, we reported that genistein was obtained from transgenic IFS tobacco roots. In addition, we revealed that endogenous genistein and 10 µg g⁻¹ exogenous genistein enhanced the development of AM symbiosis. We also revealed the relative expression levels of pertinent genes during the development of AM symbiosis. Our results suggest that genistein plays a positive role in the development of AM symbiosis in tobacco roots.
4

Effect of shrub microhabitats on aboveground and belowground arthropod distribution in a desertified steppe ecosystem

100%
Liu R., Zhu F., Steinberger Y.
Polish Journal of Ecology
|
2015
|
tom 63
|
nr 4
The influence of the shrub canopy on the spatial distribution of above and below ground arthropod communities in desertified ecosystems is largely unknown. Using the shrubs Hedysarum scoparium (H. scoparium) and Artemisia ordosica (A. ordosica) as model systems, the above and belowground arthropod communities were sampled by using pitfall trapping and hand-sorting, in order to examine the linkage between above and belowground arthropods across shrub microhabitats. Different profile layers harboured mostly distinct arthropod taxon and trophic groups that preferred specific microhabitats. Even the common taxa, including the Carabidae and Formicidae families, were found to have different abundance distributions in above and belowground soil layers across shrub microhabitats. Total abundance distribution was found to differ, while taxon-richness and Shannon-index distributions were similar in above and belowground parts across the shrub microhabitats. Markedly higher taxon-richness and Shannon-index values were found beneath the shrub canopy compared to the open spaces, particularly beneath the A. ordosica shrub canopy. The abundance distribution in above and below ground arthropod communities were affected by the shrub microhabitats along vertical and horizontal axes more than the richness and diversity of these communities. The A. ordosica shrub canopy (compared with the H. scoparium shrub) was found to have greater ecological implications on the spatial distribution of the arthropod communities. All these findings were expected to be helpful for the conservation of biodiversity, shrub plantation management, and desertification control.
5

Fractal features of soil particle size distributions and their implications for indicating enclosure management in a semiarid grassland ecosystem

100%
Chen W., Chang H., Liu R.
Polish Journal of Ecology
|
2020
|
tom 68
|
nr 2
6

Impact of hydrogen on the transcriptome of Sinorhizobium meliloti 1021 using RNA-sequencing technology

100%
Liu R., Li L., Li Z., Wang W.
Polish Journal of Microbiology
|
2020
|
tom 69
|
nr 1
7

Pollutant removal and PCR-DGGE analysis of microbial community structural changes in an integrated vertical-flow constructed wetland

88%
Nie F., Zhou Y., Liu R., Liu Z., Huang D.
Polish Journal of Environmental Studies
|
2016
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tom 25
|
nr 2
In this study we measured changes in the CODCr, TN, NH4+-N, TP, and DO concentrations and the pH of different layers in an integrated vertical-flow constructed wetland (IVCW) treating eutrophic water. We also examined the composition and diversity of the bacterial community in the IVCW using PCR-DGGE. Our results showed that most of the contaminants were removed during sewage flow from the down-flow chamber to the up-flow chamber. The removal rates of TN, TP, CODCr, and NH4+-N were, respectively, 63.7%, 66.7%, 72.2%, and 67.9% in the down-flow; consequently, the CODCr and TP concentrations of the effluent fell below 10 mg/L and 0.05 mg/L. There were some common microorganisms and specific microorganisms in the different layers of the constructed wetland because of the changes in environmental factors and nutrient levels. The diversity of the bacterial community was highest in the upper layer of the down-flow system, and the similarity in the down-flow system was higher than that in the up-flow system. From the down-flow system to the up-flow system, the diversity of the bacterial community increased from 2.31 to 1.95 and the structural similarity gradually increased from 65.7% to 70.9%. The higher complexity of the bacterial community in the upper layer of the constructed wetland may be supported by plant oxygenation, rhizodeposition, and litter accumulation.
8

Can China achieve its CO2 emission mitigation target in 2030: a system dynamics perspective

88%
Zhang L., Jiang Z., Liu R., Tang M., Wu F.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 6
To predict the feasibility of whether China can achieve an up to 65% of carbon emissions intensity (CEI) reduction goal from 2005 levels by 2030, we performed dynamic simulations and predictions of China’s CO₂ emissions at the national scale from a system dynamics perspective. More specifically, we developed a system dynamics model based on LMDI analysis to simulate and estimate CO₂ emissions under 10 different scenarios in China during 1991-2030. The result shows that China’s CEI will decrease by 67.86-84.63% in 2030 compared to the 2005 level, which means that China will be able to meet the emission reduction goal by 2030, and China’s CO₂ emissions will peak sometime between 2020 and 2025. In addition, the quantitative evidence suggests that transforming the energy structure will make a significant contribution to CO₂ emissions reduction. As the proportion of renewables increases, CO₂ emissions decrease in terms of both scale and peak value and peaks earlier. So, the findings also indicate that the optimization for energy structure by replacing fossil fuels (especially coal) with renewables at a suitable growth rate can promote the coordination between economic growth and CO₂ emissions mitigation.
9

Bacterial diversity in soybean rhizosphere soil at seedling and mature stages

88%
Wang L., Li Z., Liu R., Li L., Wang W.
Polish Journal of Microbiology
|
2019
|
tom 68
|
nr 2
Changes in the structural diversity of bacterial communities in soybean rhizospheres play important roles in plant growth and crop productivity. However, there are only a few studies on different soybean growth stages. Here, we investigated the changes in the bacterial community of soybean rhizosphere soil at two stages using Illumina high-throughput sequencing. The results showed that the bacterial abundance and diversity in the seeding stage were higher than those in the mature stage and that the diversity changed significantly. Actinobacteria, Acidobacteria, and Proteobacteria were the dominant bacteria in the soybean rhizosphere soil. Additionally, changes in Actinobacteria and Proteobacteria abundances showed opposite trends.
10

Ground-active arthropod recovery in response to size of shrub plantations in a desertified grassland ecosystem

88%
Liu R., Liu J., Zhao J., Xi W., Yang Z.
Polish Journal of Ecology
|
2017
|
tom 65
|
nr 3
The ground-active arthropod diversity response to size of shrub plantations in desertified grassland ecosystems is largely unknown. In the study ground-active arthropods were collected by pitfall trapping beneath shrub canopy of very low, low, medium and high size, with adjacent mobile sandy land as a control. It was found that arthropod dominant taxa from mobile sandy land were significantly distinctive from those from plantations of different shrub size. A considerably lower Sørensen index (i.e., 0.25–0.48) was found between the arthropod communities from mobile sandy land and the canopy of either shrub size, than between those under low and medium/high shrub size (i.e., 0.62 to 0.69). The arthropod total abundance was significantly greater under the shrub canopy of very low size in comparison to that of low and medium shrub size and mobile sandy land, with the intermediate values under shrub canopy of high shrub size. Taxon richness and diversity of arthropod communities were distinctly lower under the shrub canopy of low size in comparison to very low, medium and high shrub size. The shrub size was found to have different effects on the density and richness distribution of arthropod trophic groups (i.e., predators, phytophagous, saprophagous, and omnivorous). It was concluded that shrub plantations could facilitate ground-active arthropod diversity recovery when they were afforested in mobile sandy land. There was a contrasting effect of shrub size on ground-active arthropod diversity recovery versus arthropod abundance when grazing was excluded.
11

Isolating and identifying the atrazine-degrading strain Arthrobacter sp. LY-1 and applying it for the bioremediation of atrazine-contaminated soil

76%
Li Y., Liang D., Sha J., Zhang J., Gao J., Li H., Liu R.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 3
Atrazine is a widely used herbicide, and because of its potential to seriously pollute soil and water resources, has attracted widespread attention. In this study, the bacterial strain LY-1 was isolated and identified as the species Arthrobacter. At present, there are many different atrazine-degrading bacteria that have been screened out, including Arthrobacter sp., Pseudomonas sp., and Shewanella sp. However, previous reports only studied their degradation effects and soil remediation capabilities under optimum conditions and there were few studies performed which took into account a wider array of environmental circumstances. This study investigated the degradation effects of LY-1, as well as its capacity for soil remediation, under various conditions. The strain had broad optimum ranges of temperature and pH and the additional carbon and nitrogen sources did not decrease the atrazine degradation rate. In addition, the soil remediation tests indicated that the strain LY-1 might be a good candidate for bioremediation of atrazine-polluted soil.
12

Leaf nitrogen resorption pattern along habitats of semi-arid sandy land with different nitrogen status

76%
Luo Y., Zhao X., Zuo X., Zhang J., Liu R., Wang S.
Polish Journal of Ecology
|
2010
|
tom 58
|
nr 4
To assess nitrogen (N) resorption patterns in semi-arid sandy land, N concentrations in green leaves (Ng) and senesced leaves (Ns) of 35 species of shrubs and herbages were measured along habitats of decreasing soil total N (0.54 to 0.041 g g⁻¹ d.w. of top soil level) in Horqin Sandy Land (Inner Mongolia, China). These habitats are following: inter-dune grassland (IDG), fixed sand dune (FD), semi-fixed sand dune (SFD), semi-mobile sand dune (SMD), and mobile sand dune (MD) were considered. Results showed that Ng and Ns (i.e. nitrogen resorption proficiency, NRP) increased and leaf nitrogen use efficiency (NUE) decreased significantly with increasing soil N status across the above habitas, but nitrogen resorption efficiency (NRE) was not affected. The levels of Ng, Ns and NUE experience two stages across habitats: first, there were low Ng and Ns and high NUE in MD and SMD; second, there were high Ng and Ns and low NUE in IDG, FD and SFD. Plants from IDG, FD and SFD had incomplete N resorption during foliar senescence, but plants from MD and SMD had complete N resorption. Leaf NRE was determined by life forms which had no significant effect on Ng but on Ns and NUE. For all plants in the five habitats, NRE and NUE decreased with the sequence of grass, herb, shrub, while Ns showed a contrary tendency. Plants from strong N limitation habitats did not show higher NRE, but showed higher NRP and leaf NUE, so NRP was a more sensitive indicator of changes in N status than NRE. In conclusion, Leaf N resorption patterns were mainly determined by soil N status across habitats, and there were some consistent patterns among life forms.
13

Risk assessment of water inrush and karst tunnels based on the efficacy coefficient method

76%
Wang Y., Yin X., Geng F., Jing H., Su H., Liu R.
Polish Journal of Environmental Studies
|
2017
|
tom 26
|
nr 4
Water inrush is one of the typical geological hazards of tunnel construction in karst areas. It is necessary to predict water inrush more accurately for karst tunnels. Firstly, we created a model on risk evaluation of water inrush based on the efficacy coefficient method. Then karst hydrologic and engineering geological conditions were considered in detail, and several typical factors were selected as evaluation indexes, including formation lithology, unfavorable geology, groundwater level, and so on. Moreover, the weight coefficients of the selected evaluation indices were calculated using the analytic hierarchy process method. Furthermore, the total efficacy coefficient was presented to specify the risk grade of the evaluation samples. Finally, the risk grade of water inrush for karst tunnels is divided into four levels: severe (red), high (orange), elevated (yellow), and guarded (blue). Additionally, the model of risk assessment of water inrush was applied to Jigongling tunnel along the Fanba Expressway in China. The results show that the present evaluation results agree well with the construction situation, which also agree with the relative analysis results of attribute mathematical theory. The presented work with the efficacy coefficient method is relatively simple with strong operability, which has potential for predicting water inrush in karst tunnels.
14

Effects of exogenous hydrogen sulfide on the ascorbate and glutathione metabolism in wheat seedlings leaves under water stress

64%
Shan C., Zhang S., Li D., Zhao Y., Tian X., Zhao X., Wu Y., Wei X., Liu R.
Acta Physiologiae Plantarum
|
2011
|
tom 33
|
nr 6
This study investigated the effects of exogenous hydrogen sulfide on the ascorbate and glutathione metabolism in wheat seedlings leaves under water stress. The results showed that pretreatment with sodium hydrosulfide (NaHS), hydrogen sulfide donor, increased the activities of ascorbate peroxidase, glutathione reductase, dehydroascorbate reductase and gamma-glutamylcysteine synthetase, and the contents of reduced ascorbic acid, reduced glutathione, total ascorbate and total glutathione under water stress, compared to control and water stress without NaHS. Meanwhile, pretreatment with NaHS decreased the malondialdehyde content and electrolyte leakage induced by water stress in plants, compared to control and water stress without NaHS. Our results suggested that exogenous hydrogen sulfide alleviated oxidative damage by regulating the ascorbate and glutathione metabolism in wheat seedlings under water stress.
15

Influence of oleic acid in different solvent media on BRL 3A cell growth and viability

64%
Liu R., Yang W., Xia C., Chen Y., Gao S., Dong Z., Huang B., Li R., He P., Xu C.
Acta Biochimica Polonica
|
2018
|
tom 65
|
nr 3
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