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1

Drought tolerance of Periploca sepium during seed germination: antioxidant defense and compatible solutes accumulation

100%
An Y., Liang Z.
Acta Physiologiae Plantarum
|
2013
|
tom 35
|
nr 03
Periploca sepium Bunge is a native and widespread shrub on the Loess Plateau, an arid and semi-arid region in China. To understand the adaptability of its seed germination to dry environments, we investigated the germination rate, water relations, lipid peroxidation, antioxidant capacity and accumulation of major organic solutes during seed germination under water deficit conditions. Results showed that seeds pre-treated by hydration–dehydration or -0.9 MPa PEG germinated faster than control seeds, indicating strong resistance of P. sepium to drought condition. The re-dried seeds showed higher proline, total free amino acids (TFAA) and soluble proteins (SP) contents than control dry seeds, indicating the maintenance of physiological advancement when dehydrated. Osmotic stress made seed germination stay on the plateau phase (phase II). However, germinating seeds moved into phase III immediately once transferred into distilled water. Large increases in SP and soluble sugars (SS) of both re-dried and osmotic stressed seeds help themselves to resist drought stress. The re-hydrated seeds showed significantly higher levels of proline, TFAA, SP and SS than control seeds. The largely accumulated SS during osmotic stress declined sharply when transferred into distilled water. Our data demonstrate that P. sepium’s tolerance to drought stresses during germination is associated with enhanced activity of antioxidant enzymes and accumulation of some compatible solutes. Seed physiological advancement progressed slowly under low water conditions and it was maintained when seeds were air dried. This strategy ensures high and more rapid seed germination of P. sepium under drying and wetting conditions in drought-prone regions.
2

Eco-physiological responses of Carex Schmidtii to soil salinization in a Chinese wetland

71%
Zhang D., Qi Q., Wang X., Tong S., An Y.
Polish Journal of Environmental Studies
|
2019
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tom 28
|
nr 5
Soil salinization, a growing problem in arid and semi-arid areas, significantly influences the ecological dynamics and processes in wetland ecosystems. To fully examine the physiological responses with the aim of wetland protection and management, a laboratory simulation experiment was conducted to study the effects of soil salinization on the growth of C. schmidtii tussocks. Plant height and leaf traits, as well as physiological characteristics, were analyzed to explore the responses of C. schmidtii to soil salinization. Results showed that the highest value of electrical conductivity (EC) (4.71 mS/cm) recorded in 4000 mg/L treatment was 3.04 times greater than the lowest value (1.55 mS/cm) recorded in 0 mg/L treatment. It was well demonstrated that plant height under the 1000 mg/L treatment was 57.6% greater than that obtained under the 4000 mg/L treatment. Additionally, the growth of plants under the 4000 mg/L treatment achieved significantly higher length and the ratio of leaf withering (by 13.76 and 16.42 times, respectively), compared with those obtained under 0 mg/L treatment. 0 and 1000 mg/L treatments were found to greatly increase chlorophyll content and decrease malondialdehyde. Hence, slight salinization will stimulate the responses of C. schmidtii to environmental fluctuation, but the persistent serious salinization can inhibit the growth and physiology of C. schmidtii. The optimum ecological threshold of salinity for the growth of C. schmidtii was in the range 0~1000 mg/L. Results help in understanding the responses of C. schmidtii tussocks to soil salinization, and suggest the vital significance of preventing salinization in the Momoge Wetlands of northeastern China.
3

Exogenous spermidine maintains the chloroplast structure of cucumber seedlings and inhibits the degradation of photosynthetic protein complexes under high-temperature stress

61%
Wang L., Zhou H., Guo S., An Y., Shu S., Lu N., Sun J.
Acta Physiologiae Plantarum
|
2018
|
tom 40
|
nr 03
4

Exogenous spermidine delays chlorophyll metabolism in cucumber leaves (Cucumis sativus L.) under high temperature stress

61%
Zhou H., Guo S., An Y., Shan X., Wang Y., Shu S., Sun J.
Acta Physiologiae Plantarum
|
2016
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tom 38
|
nr 09
5

5-Aminolevulinic acid (ALA) promotes primary root elongation through modulation of auxin transport in Arabidopsis

61%
An Y., Cheng D., Rao Z., Sun Y., Tang Q., Wang L.
Acta Physiologiae Plantarum
|
2019
|
tom 41
|
nr 06
The specific function of 5-aminolevulinic acid (ALA), a new plant growth regulator, in modulating root growth of plants and the mechanisms underlying ALA-regulated root growth are largely unknown. Here, Arabidopsis seedlings were photographed and collected before and after ALA or 2,3,5-triiodobenzoic acid (TIBA) treatment for determination of root growth, fluorescence intensities of PIN1, PIN2, PIN7, and DR5, and gene expression levels of auxin synthesis, signaling, and transport. We first demonstrated that ALA significantly promoted Arabidopsis primary root elongation. We also found that TIBA, an auxin polar transport inhibitor, inhibited ALA-promoted root elongation, indicating that auxin transport is involved in ALA-regulated root growth. Then, the observations of PIN1, PIN2, and PIN7 at protein and transcript levels suggest that ALA improves auxin transport mainly through regulating auxin efflux carriers. Furthermore, the expression patterns of auxin-responsive reporter DR5rev:GFP were not correlated well with the expression of YUC2, a key biosynthetic gene of auxin, but were consistent with changes of PIN1, PIN2, and PIN7. In addition, ALA did not affect the gene expression of auxin receptor, TRANSPORT-INHIBITOR-RESISTANT1 (TIR1). Taken together, we conclude that ALA promotes primary root elongation of young Arabidopsis seedlings mainly through improving auxin transport. Our data suggest the reciprocal interaction between ALA and auxin, providing new insights into the mechanisms underlying ALA-promoted plant root growth.
6

Inhibition of drug resistance of Staphylococcus aureus by efflux pump inhibitor and autolysis inducer to strengthen the antibacterial activity of Beta-lactam drugs

42%
Luan W., Liu X., Wang X., An Y., Wang Y., Wang C., Shen K., Xu H., Li S., Liu M., Yu L.
Polish Journal of Microbiology
|
2019
|
tom 68
|
nr 4
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