Functional Identification of H+-ATPase and Na+/H+ Antiporter in the Plasma Membrane Isolated from the Root Cells of Salt-Accumulating Halophyte Suaeda altissima

Lun'kov, R. V.; Andreev, I. M.; Myasoedov, N. A.; Khailova, G. F.; Kurkova, E. B.; Balnokin, Yu. V.

doi:10.1007/s11183-005-0094-6

Cited by 16 publications

(7 citation statements)

References 34 publications

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“…Our experiments with S. altissima [13,17] showed that Na + accumulation in the root xylem of euhalophytes is accomplished by the Na + /H + antiporter located at the plasma membrane of parenchymal cells adjacent to the xylem. BALNOKIN et al . The diversity of morphological and anatomical traits in halophytes (e.g., the presence or absence of salt glands in leaves, occurrence of xeromorphic or succulent-type tissue structures) raises the question of possible differences in organization of ion transport and water relations in various halophytes.…”

Section: Introductionmentioning

confidence: 76%

Significance of Na+ and K+ for Sustained Hydration of Organ Tissues in Ecologically Distinct Halophytes of the Family Chenopodiaceae

Balnokin

Myasoedov

Shamsutdinov

et al. 2005

Russ J Plant Physiol

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The contents of Na + , K + , water, and dry matter were measured in leaves and roots of euhalophytes Salicornia europaea L. and Climacoptera lanata (Pall.) Botsch featuring succulent and xeromorphic cell structures, respectively, as well as in saltbush Atriplex micrantha C.A. Mey, a halophyte having bladder-like salt glands on their leaves. All three species were able to accumulate Na + in their tissues. The Na + content in organs increased with elevation of NaCl concentration in the substrate, the concentrations of Na + being higher in leaves than in roots. When these halophytes were grown on a NaCl-free substrate, a trend toward K + accumulation was observed and was better pronounced in leaves than in roots. Particularly high K + concentrations were accumulated in Salicornia leaves. There were no principal differences in the partitioning of Na + and K + between organs of three halophyte species representing different ecological groups. At all substrate concentrations of NaCl, the total content of Na + and K + in leaves was higher than in roots. This distribution pattern persisted in Atriplex possessing salt glands, as well as in euhalophytes Salicornia and Climacoptera. The physiological significance of such universal pattern of ion accumulation and distribution among organs in halophytes is related to the necessity of water absorption by roots, its transport to shoots, and maintenance of sufficient cell water content in all organs under high soil salinity.

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Section: Introductionmentioning

confidence: 76%

Significance of Na+ and K+ for Sustained Hydration of Organ Tissues in Ecologically Distinct Halophytes of the Family Chenopodiaceae

Balnokin

Myasoedov

Shamsutdinov

et al. 2005

Russ J Plant Physiol

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“…Secondly, xylem Na + loading may be a thermodynamically active process that requires energy to pump Na + into the xylem (De Boer and Volkov, 2003;Lun'kov et al, 2005;Shabala and Mackay, 2011). Indeed, given the highly negative membrane potential values for halophyte parenchyma cells (e.g.…”

Section: Targeting Xylem Ion Loadingmentioning

confidence: 99%

Learning from halophytes: physiological basis and strategies to improve abiotic stress tolerance in crops

Shabala¹

2013

Annals of Botany

687

467

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This review argues that learning from halophytes may be a promising way of achieving this goal. The paper is focused around two central questions: what are the key physiological mechanisms conferring salinity tolerance in halophytes that can be introduced into non-halophyte crop species to improve their performance under saline conditions and what specific genes need to be targeted to achieve this goal? The specific traits that are discussed and advocated include: manipulation of trichome shape, size and density to enable their use for external Na(+) sequestration; increasing the efficiency of internal Na(+) sequestration in vacuoles by the orchestrated regulation of tonoplast NHX exchangers and slow and fast vacuolar channels, combined with greater cytosolic K(+) retention; controlling stomata aperture and optimizing water use efficiency by reducing stomatal density; and efficient control of xylem ion loading, enabling rapid shoot osmotic adjustment while preventing prolonged Na(+) transport to the shoot.

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“…The underlying transport mechanisms involved in both Na + loading into the xylem and its retrieval from the transpiration stream also remain highly controversial. Both passive (Wegner and Raschke, 1994; Wegner and De Boer, 1997; Köhler and Raschke, 2000) and active (De Boer and Volkov, 2003; Lun’kov et al. , 2005; Munns and Tester, 2008) models have been vigorously advocated.…”

Section: Introductionmentioning

confidence: 99%

Xylem ionic relations and salinity tolerance in barley

et al. 2010

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SUMMARYControl of ion loading into the xylem has been repeatedly named as a crucial factor determining plant salt tolerance. In this study we further investigate this issue by applying a range of biophysical [the microelectrode ion flux measurement (MIFE) technique for non-invasive ion flux measurements, the patch clamp technique, membrane potential measurements] and physiological (xylem sap and tissue nutrient analysis, photosynthetic characteristics, stomatal conductance) techniques to barley varieties contrasting in their salt tolerance. We report that restricting Na + loading into the xylem is not essential for conferring salinity tolerance in barley, with tolerant varieties showing xylem Na + concentrations at least as high as those of sensitive ones. At the same time, tolerant genotypes are capable of maintaining higher xylem K + /Na + ratios and efficiently sequester the accumulated Na + in leaves. The former is achieved by more efficient loading of K + into the xylem. We argue that the observed increases in xylem K + and Na + concentrations in tolerant genotypes are required for efficient osmotic adjustment, needed to support leaf expansion growth. We also provide evidence that K + -permeable voltage-sensitive channels are involved in xylem loading and operate in a feedback manner to maintain a constant K + /Na + ratio in the xylem sap.

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Functional Identification of H+-ATPase and Na+/H+ Antiporter in the Plasma Membrane Isolated from the Root Cells of Salt-Accumulating Halophyte Suaeda altissima

Cited by 16 publications

References 34 publications

Significance of Na+ and K+ for Sustained Hydration of Organ Tissues in Ecologically Distinct Halophytes of the Family Chenopodiaceae

Significance of Na+ and K+ for Sustained Hydration of Organ Tissues in Ecologically Distinct Halophytes of the Family Chenopodiaceae

Learning from halophytes: physiological basis and strategies to improve abiotic stress tolerance in crops

Xylem ionic relations and salinity tolerance in barley

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