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Physiological responses of Kosteletzkya virginica to coastal wetland soil.

Wang H, Tang X, Wang H, Shao H - ScientificWorldJournal (2015)

Bottom Line: Plant height, fresh weight (FW), dry weight (DW), and net photosynthetic rate (Pn) increased at 100 mM NaCl and slightly declined at 200 mM, but higher salinity induced a significant reduction.Furthermore, no significant differences of Fv/Fm and ΦPSII were found at lower than 200 mM NaCl, whereas higher salinity caused the declines of Fv/Fm, ΦPSII, and qP similar to Pn, accompanied with higher NPQ.These results provided important implications for Kosteletzkya virginica acting as a promising multiuse species for reclaiming coastal soil.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Coastal Biology & Bioresources Utilization, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, China ; Yantai Academy of China Agriculture University, Yantai 264670, China ; University of Chinese Academy of Sciences, Beijing 100049, China.

ABSTRACT
Effects of salinity on growth and physiological indices of Kosteletzkya virginica seedlings were studied. Plant height, fresh weight (FW), dry weight (DW), and net photosynthetic rate (Pn) increased at 100 mM NaCl and slightly declined at 200 mM, but higher salinity induced a significant reduction. Chlorophyll content, stomatal conductance (Gs), intercellular CO2 concentration (Ci), and transpiration rate (E) were not affected under moderate salinities, while markedly decreased at severe salinities except for the increased Ci at 400 mM NaCl. Furthermore, no significant differences of Fv/Fm and ΦPSII were found at lower than 200 mM NaCl, whereas higher salinity caused the declines of Fv/Fm, ΦPSII, and qP similar to Pn, accompanied with higher NPQ. Besides, salt stress reduced the leaf RWC, but caused the accumulation of proline to alleviate osmotic pressure. The increased activities of antioxidant enzymes maintained the normal levels of MDA and relative membrane permeability. To sum up, Kosteletzkya virginica seedlings have good salt tolerance and this may be partly attributed to its osmotic regulation and antioxidant capacity which help to maintain water balance and normal ROS level to ensure the efficient photosynthesis. These results provided important implications for Kosteletzkya virginica acting as a promising multiuse species for reclaiming coastal soil.

No MeSH data available.


Changes of MDA (a), relative membrane permeability (b), SOD activity (c), POD activity (d), and CAT activity (e) in seedlings exposed to different NaCl concentrations.
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fig4: Changes of MDA (a), relative membrane permeability (b), SOD activity (c), POD activity (d), and CAT activity (e) in seedlings exposed to different NaCl concentrations.

Mentions: Salt stress induced a significant increase in the levels of MDA (Figure 4(a)), indicating the generation of lipid peroxidation. A slight increase in the MDA content was observed under 200 mM NaCl, but 300 and 400 mM NaCl treatments caused a 13.09% and 35.91% increase in MDA content, respectively. These results were concomitant with a significant increase in relative membrane permeability (Figure 4(b)). There was also a gradual increase in SOD and POD activity (Figures 4(c) and 4(d)) with the increasing NaCl concentrations, but the activity of CAT was firstly stimulated by 100 mM NaCl and reached the maximum at 200 mM NaCl and then declined.


Physiological responses of Kosteletzkya virginica to coastal wetland soil.

Wang H, Tang X, Wang H, Shao H - ScientificWorldJournal (2015)

Changes of MDA (a), relative membrane permeability (b), SOD activity (c), POD activity (d), and CAT activity (e) in seedlings exposed to different NaCl concentrations.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4379433&req=5

fig4: Changes of MDA (a), relative membrane permeability (b), SOD activity (c), POD activity (d), and CAT activity (e) in seedlings exposed to different NaCl concentrations.
Mentions: Salt stress induced a significant increase in the levels of MDA (Figure 4(a)), indicating the generation of lipid peroxidation. A slight increase in the MDA content was observed under 200 mM NaCl, but 300 and 400 mM NaCl treatments caused a 13.09% and 35.91% increase in MDA content, respectively. These results were concomitant with a significant increase in relative membrane permeability (Figure 4(b)). There was also a gradual increase in SOD and POD activity (Figures 4(c) and 4(d)) with the increasing NaCl concentrations, but the activity of CAT was firstly stimulated by 100 mM NaCl and reached the maximum at 200 mM NaCl and then declined.

Bottom Line: Plant height, fresh weight (FW), dry weight (DW), and net photosynthetic rate (Pn) increased at 100 mM NaCl and slightly declined at 200 mM, but higher salinity induced a significant reduction.Furthermore, no significant differences of Fv/Fm and ΦPSII were found at lower than 200 mM NaCl, whereas higher salinity caused the declines of Fv/Fm, ΦPSII, and qP similar to Pn, accompanied with higher NPQ.These results provided important implications for Kosteletzkya virginica acting as a promising multiuse species for reclaiming coastal soil.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Coastal Biology & Bioresources Utilization, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Yantai 264003, China ; Yantai Academy of China Agriculture University, Yantai 264670, China ; University of Chinese Academy of Sciences, Beijing 100049, China.

ABSTRACT
Effects of salinity on growth and physiological indices of Kosteletzkya virginica seedlings were studied. Plant height, fresh weight (FW), dry weight (DW), and net photosynthetic rate (Pn) increased at 100 mM NaCl and slightly declined at 200 mM, but higher salinity induced a significant reduction. Chlorophyll content, stomatal conductance (Gs), intercellular CO2 concentration (Ci), and transpiration rate (E) were not affected under moderate salinities, while markedly decreased at severe salinities except for the increased Ci at 400 mM NaCl. Furthermore, no significant differences of Fv/Fm and ΦPSII were found at lower than 200 mM NaCl, whereas higher salinity caused the declines of Fv/Fm, ΦPSII, and qP similar to Pn, accompanied with higher NPQ. Besides, salt stress reduced the leaf RWC, but caused the accumulation of proline to alleviate osmotic pressure. The increased activities of antioxidant enzymes maintained the normal levels of MDA and relative membrane permeability. To sum up, Kosteletzkya virginica seedlings have good salt tolerance and this may be partly attributed to its osmotic regulation and antioxidant capacity which help to maintain water balance and normal ROS level to ensure the efficient photosynthesis. These results provided important implications for Kosteletzkya virginica acting as a promising multiuse species for reclaiming coastal soil.

No MeSH data available.