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1

Effects of salinity and nitric oxide donor sodium nitroprusside (SNP) on development and salt secretion of salt glands of Limonium bicolor

100%
Ding F.
Acta Physiologiae Plantarum
|
2013
|
tom 35
|
nr 03
NO, as a signaling molecule, is involved in abiotic stresses. Limonium bicolor seedlings were treated with 200 mM NaCl combined with 0.05 mM SNP for 20 days to study the effects of NO on development and salt-secretion rates of salt glands. It was shown that the total number of salt glands on adaxial surfaces under condition of 200 mM NaCl containing 0.05 mM SNP treatment increased significantly compared with that under 200 mM NaCl treatment. Na+ secretion rate per leaf under 200 mM NaCl containing 0.05 mM SNP was significantly higher than that under 200 mM NaCl without SNP. However, there was no significant difference in salt-secretion rate of individual salt glands between 200 mM NaCl containing 0.05 mM SNP treatment and 200 mM NaCl treatment. Although there was no significant difference in salt-secretion rate of individual glands, Na? concentration in the leaves treated with 200 mM NaCl solution containing SNP was significantly lower than that treated with 200 mM NaCl solution. Treatment with 200 mM NaCl solution containing SNP caused a remarkable increase in Na? concentration in salt glands. Obviously, the efficiency of the secretion process per gland was enhanced by adding SNP to NaCl. The results showed NO may enhance the salt secretion by inducing more dermatogen cells to develop into salt glands and by enhancing the efficiency of the secretion process per gland.
2

Comparison of the effects of NaCl and KCl at the roots on seedling growth, cell death and the size, frequency and secretion rate of salt glands in leaves of Limonium sinense

51%
Ding F., Song J., Ruan Y., Wang B.
Acta Physiologiae Plantarum
|
2009
|
tom 31
|
nr 2
Twenty days’ exposure to 50 or 100 mM NaCl in the rooting medium substantially increased fresh and dry weights of seedling shoots of the recretohalophyte Limonium sinense while 200 or 300 mM were increasingly inhibitory. KCl treatment was only slightly stimulating (50 mM) or strongly inhibitory (100–300 mM). Lesser effects on leaf area were also seen. Diameter of foliar salt glands was significantly larger than that of controls in 100 and 200 mM NaCl with the effect being reversed at higher concentrations. Gland enlargement was also observed in the presence of 100 mM KCl, while larger concentrations reduced gland size. Generally, gland diameter was larger in the presence of NaCl than in KCl. NaCl and KCl also increased gland number per leaf and secretion rate per gland. At 100 and 200 mM NaCl or KCl, Na⁺ secretion per leaf from NaCl-treated plants exceeded K⁺ secretion rate from KCl-treated plants while at 200 mM, Na⁺ secretion per gland was significantly higher for Na⁺ than for K⁺. Evidence of cell death in leaves of salt-treated plants using Evans blue staining indicates that release of cell contents through loss of membrane integrity contributed to the secretion values. We conclude that the greater tolerance of L. sinenseto to NaCl compared to KCl is linked to the more effective secretion of Na⁺ than of K⁺ and, in turn, to a greater stimulation of salt gland formation and activity and larger gland diameter.
3

Evaluating SWAT snowmelt parameters and simulating spring snowmelt nonpoint source pollution in the source area of the Liao River

45%
Wang Y., Bian J., Wang S., Tang J., Ding F.
Polish Journal of Environmental Studies
|
2016
|
tom 25
|
nr 5
Snowmelt hydrology becomes an important component of the soil and water assessment tool (SWAT) when spring flows are dominated by melting snow. The objective of this study was to evaluate the performance of the SWAT model’s snowmelt parameters by simulating nonpoint source pollution in the source area of the Liao River – a cold area in China. The seven snowmelt parameters for the simulation were adjusted. The exports rule of nonpoint source pollution for the spring snowmelt period was analyzed. The result show that SFTMP, SMTMP, SMFMX, SMFMN, and TIMP were sensitive parameters, while SNOCOVMX and SNO50COV were insensitive. In addition, two common statistics (Nash-Sutcliffe coefficient, and coefficient of determination) were used to evaluate the model. This evaluation indicated that the SWAT model had good performance simulating the seasonal nonpoint source pollution with large snowmelt. According to the analysis, rainfall and snowmelt is a main driver of nonpoint source pollution in the cold area, and that summer and spring are high-risk seasons. The study provides a new and suitable method of nonpoint source pollution simulation for the cold areas.
4

The molecular cloning of glial fibrillary acidic protein in Gekko japonicus and its expression changes after spinal cord transection

39%
Gao D., Wang Y., Liu Y., Ding F., Gu X., Li Z.
Cellular and Molecular Biology Letters
|
2010
|
tom 15
|
nr 4
The glial fibrillary acidic protein (GFAP) is an astrocyte-specific member of the class III intermediate filament proteins. It is generally used as a specific marker of astrocytes in the central nervous system (CNS). We isolated a GFAP cDNA from the brain and spinal cord cDNA library of Gekko japonicus, and prepared polyclonal antibodies against gecko GFAP to provide useful tools for further immunochemistry studies. Both the real-time quantitative PCR and western blot results revealed that the expression of GFAP in the spinal cord after transection increased, reaching its maximum level after 3 days, and then gradually decreased over the rest of the 2 weeks of the experiment. Immunohistochemical analyses demonstrated that the increase in GFAP-positive labeling was restricted to the white matter rather than the gray matter. In particular, a slight increase in the number of GFAP positive star-shaped astrocytes was detected in the ventral and lateral regions of the white matter. Our results indicate that reactive astrogliosis in the gecko spinal cord took place primarily in the white matter during a short time interval, suggesting that the specific astrogliosis evaluated by GFAP expression might be advantageous in spinal cord regeneration.
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