Structural and Functional State of Thylakoids in a Halophyte Suaeda altissima before and after Disturbance of Salt–Water Balance by Extremely High Concentrations of NaCl

Balnokin, Yu. V.; Kurkova, E. B.; Myasoedov, N. A.; Lun'kov, R. V.; Shamsutdinov, N. Z.; Egorova, E. A.; Bukhov, N. G.

doi:10.1023/b:rupp.0000047831.85509.a6

Cited by 27 publications

(18 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At high NaCl concentrations in the growth medium (750 mM and 1 M), when decreased to -3.35 and -4.6 MPa, respectively (Fig. 2c), the water homeostasis in S. altissima was disordered, in consistency with the results of our previous study [9].…”

Section: Resultssupporting

confidence: 90%

“…Our data obtained in previous studies showed that the leaves of S. altissima plants accumulated Na + ions to the levels much higher than those in roots [9]. Present measurements of water and osmotic potentials in organs of S. altissima showed that the water potential gradient was generated along the plant axis and directed upward; it corresponded to the distribution of Na + between roots and leaves.…”

Section: Discussionmentioning

confidence: 57%

“…The results show that low turgor pressure in cells of S. altissima provides a certain contribution, though comparatively small, to the decrease of cell water potential at high salinity. Studies of the ultrastructure of leaf cells of S. altissima revealed that the presence of 1 M NaCl in the outer medium caused cell plasmolysis and a concomitant decrease in cell water content [9]. In this case, the shrinkage of protoplasts could produce elastic deformations of cell walls directed inward, which in turn would bring the intracellular hydrostatic…”

Section: Resultsmentioning

confidence: 99%

“…where π Nα is the osmotic pressure created by Na + ions, R is the gas constant, T is absolute temperature, ë Na is Na + content in organs per 1 kg fresh weight (data obtained previously [9]). The comparison shows that Na + ions together with charge-neutralizing anions account for a considerable part of the root water potential (from one-third to two-thirds of the measured value, depending on NaCl concentration in the medium).…”

Section: Resultsmentioning

confidence: 99%

“…We showed in a previous study [9] that the seepweed ( Suaeda altissima ) is a typical salt-accumulating halophyte. The NaCl concentration optimal for growth of this plant species in water culture was 250 mM, but the plants could grow at salt concentrations up to 1 M NaCl, although the growth rates were very low under these high-salinity conditions.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Involvement of Long-Distance Na+ Transport in Maintaining Water Potential Gradient in the Medium-Root-Leaf System of a Halophyte Suaeda altissima

Balnokin

Kotov

Myasoedov

et al. 2005

Russ J Plant Physiol

Self Cite

View full text Add to dashboard Cite

The aim of this study was to determine the range of NaCl concentrations in the nutrient solution that allow Suaeda altissima (L.) Pall., a salt-accumulating halophyte, to maintain the upward gradient of water potential in the "medium-root-leaf" system. We evaluated the contribution of Na + ions in the formation of water potential gradient and demonstrated that Na + loading into the xylem is involved in this process. Plants were grown in water culture at NaCl concentrations ranging from zero to 1 M. The water potential of leaf and root cells was measured with the method of isopiestic thermocouple psychrometry. When NaCl concentration in the growth medium was raised in the range of 0-500 mM (the medium water potential was lowered accordingly), the root and leaf cells of S. altissima decreased their water potential, thus promoting the maintenance of the upward water potential gradient in the medium-root-leaf system. Growing S. altissima at NaCl concentrations of 750 mM and 1 M disordered water homeostasis and abolished the upward gradient of water potential between roots and leaves. At NaCl concentrations of 0-250 mM, the detached roots of S. altissima were capable of producing the xylem exudate. The concentration of Na + in the exudate was 1.3 to 1.6 times higher than in the nutrient medium; the exudate pH was acidic and was lowered from 5.5 to 4.5 with the rise in the salt concentration. The results indicate that the long-distance Na + transport and, especially, the mechanism of Na + loading into the xylem play a substantial role in the formation of water potential gradient in S. altissima. The accumulation of Na + in the xylem and acidic pH values of the xylem sap suggest that Na + loading into the xylem is carried out by the Na + /H + antiporter of the plasma membrane in parenchymal cells of the root stele.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Discussionmentioning

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Involvement of Long-Distance Na+ Transport in Maintaining Water Potential Gradient in the Medium-Root-Leaf System of a Halophyte Suaeda altissima

Balnokin

Kotov

Myasoedov

et al. 2005

Russ J Plant Physiol

Self Cite

View full text Add to dashboard Cite

show abstract

Effects of Shrub Islands Created by Rhodomyrtus tomentosa (Aiton) Hassk. on the Growth, Chlorophyll Fluorescence, and Chloroplast ultrastructure of Pine Seedlings in Degraded Land of South China

et al. 2015

View full text Add to dashboard Cite

In degraded land of South China, the shrub Rhodomyrtus tomentosa (Aiton) Hassk. grows in aggregations and creates "shrub islands" with increased soil porosity and soil moisture but reduced soil nutrient content and light penetration. Previous researches indicated that these shrub islands can facilitate establishment of broad-leaved tree seedlings. Because conifers are commonly used in reforestation projects, we determined whether shrub islands created by R. tomentosa also facilitate coniferous seedlings. Two common conifers, the native Pinus massoniana and the exotic Pinus elliottii, were transplanted on shrub islands and in open spaces (controls) between islands, and their growth, chlorophyll fluorescence, and chloroplast ultrastructure were investigated. Neither of the pine species was facilitated by the shrub islands. P. elliottii grew obviously higher in the open than under the R. tomentosa canopy, while P. massoniana was not facilitated by shrub islands, but it was not hindered either. The reduced growth of P. elliottii on shrub islands was associated with dilation of thylakoids in chloroplasts of mesophyll cells, lowered chlorophyll content, and reduced electron transport rate values. The results of this study indicate that P. elliottii should be transplanted in open spaces, and P. massoniana can be transplanted in open spaces or on shrub islands as part of restoration efforts, and the restoration technology of shrub island should be carefully used in degraded land of South China according to the species identity.

show abstract

Deploying Mechanisms Adapted by Halophytes to Improve Salinity Tolerance in Crop Plants: Focus on Anatomical Features, Stomatal Attributes, and Water Use Efficiency

Ankanagari

Rajasheker

Jawahar

et al. 2018

Salinity Responses and Tolerance in Plants, Volume 1

View full text Add to dashboard Cite

Structural and Functional State of Thylakoids in a Halophyte Suaeda altissima before and after Disturbance of Salt–Water Balance by Extremely High Concentrations of NaCl

Cited by 27 publications

References 14 publications

Involvement of Long-Distance Na+ Transport in Maintaining Water Potential Gradient in the Medium-Root-Leaf System of a Halophyte Suaeda altissima

Involvement of Long-Distance Na+ Transport in Maintaining Water Potential Gradient in the Medium-Root-Leaf System of a Halophyte Suaeda altissima

Effects of Shrub Islands Created by Rhodomyrtus tomentosa (Aiton) Hassk. on the Growth, Chlorophyll Fluorescence, and Chloroplast ultrastructure of Pine Seedlings in Degraded Land of South China

Deploying Mechanisms Adapted by Halophytes to Improve Salinity Tolerance in Crop Plants: Focus on Anatomical Features, Stomatal Attributes, and Water Use Efficiency

Contact Info

Product

Resources

About