Studies on growth and distribution of Na+, K+ and Cl− in soybean varieties differing in salt tolerance

Läuchli, André; Wieneke, J.

doi:10.1002/jpln.19791420103

Cited by 133 publications

(55 citation statements)

References 25 publications

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“…Avoiding an excessive reduction of cytoplasmic K + /Na + ratios appears to be a general mechanism of defence against high salinity; determination of ion levels in specific subcellular compartments is, however, technically difficult, and it has been recently considered that measurements of salt-induced changes in total leaf K + concentrations represent a more a parsimonious approach to assess plant responses to salt stress [42,66]. The maintenance or even increase of K + levels in plants under salt stress conditions has been reported in many crops, including the classical study by Läuchli and Wieneke in soybean [67].…”

Section: Ion Homeostasismentioning

confidence: 99%

Effects of Drought and Salinity on European Larch (Larix decidua Mill.) Seedlings

Plesa

González-Orenga

Hassan

et al. 2018

Forests

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Larix decidua, the European larch, is not normally affected by drought or salinity in its natural habitats, but it may be when grown as an ornamental tree, by the widespread practice of winter de-icing of mountain roads with NaCl, and because of global warming-induced environmental changes. The responses of two-month-old larch seedlings to 30 days water deficit (withholding irrigation) or salt stress (150 mM NaCl) treatments were studied by determining stress-induced changes in several growth parameters and biochemical markers (ion and osmolyte contents, level of oxidative stress, activation of enzymatic and non-enzymatic antioxidant systems). Both treatments caused the inhibition of growth, degradation of photosynthetic pigments, a small increase in malondialdehyde (MDA, an oxidative stress biomarker), and the activation of antioxidant enzymes: superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR). In all cases, salinity appeared to have stronger effects on the seedlings than water deficit. The presence of relatively high concentrations of glycine betaine, both in control and stressed plants, may represent a constitutive mechanism of defence against stress in European larch. Additionally, other responses were specific for salt stress and included the activation of K + transport from roots to shoots and the accumulation of Pro as an osmoprotectant.

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Section: Ion Homeostasismentioning

confidence: 99%

Effects of Drought and Salinity on European Larch (Larix decidua Mill.) Seedlings

Plesa

González-Orenga

Hassan

et al. 2018

Forests

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“…In soybean, discrimination in upward transport is against Clrather than (or in addition to) sodium (13,21). It has long been known that glycophytes, including many crop plants, exclude sodium from their shoots, at least at low external sodium concentrations (4).…”

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confidence: 99%

Uptake and Distribution of Sodium and Potassium by Corn Seedlings

Johanson

Cheeseman²

1983

Plant Physiol.

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The distribution of sodium and potassium throughout corn (Zea mays L. jA632 x Crows 36401 x Oh 43) plants is not simply a matter of uptake by cortical cells and irreversible delivery to the xylem for upward transport. We show that sodium, but not potassium, accumulates in the mesocotyl of corn seedlings grown on NaCl medium. Upon transfer to NaCI-free medium, total sodium is reduced by export through the roots but remains at high levels within the mesocotyl. We report experiments which consider uptake from the xylem.Shoots excised at the seed were allowed to transpire solutions containing 22Na and 42K. Potassium uptake within the mesocotyl was very sensitive to concentration, increasing 27-fold between 1 and 10 millimolar. Sodium uptake was dependent upon the square root of the concentration suggesting active accumulation. At sodium concentrations below I millimolar, more than 80% of the sodium in the plant was retained in the mesocotyl. Both the uptake by and retention within the mesocotyl were dependent upon transpiration rate as well as concentration. We discuss the limitations of measuring uptake from a finite, depletable medium. The mesocotyl is a modified root with a cuticulrized epidermis. We discuss the feasibility of using this 'plastic-coated root' as a model for root transport studies.Over the past fifteen years a good deal of progress has been made in understanding the movements of K+, Cl-, and Nae between an external medium and roots or root segments. Less progress has been made in understanding the distribution and redistribution of ions once they have crossed the endodermis. By far the major effort has been directed toward understanding of the delivery of ions to the xylem (17), and despite evidence to the contrary, summarizing models imply that, once delivered to the transpiration stream, an ion is destined for the shoot (14,17 (20) found the ascending transpiration stream in corn to contain less sodium and the root to retain more toward the basal end. Jacoby (8-10), using Phaseolus vulgaris, studied the upward movement 'Supported by National Science Foundation grant PCM 80-11138.

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“…Among leaves barely or not at all into S2 at 18 DAT, only leaf number 12 showed a significant decline in [K] leaf . At first the result of well maintained [K] leaf seems rather heretical against the background of drastically reduced [K] leaf widely reported for saltsensitive dicots following salinization (Abel & MacKenzie, 1964 ;Dehan & Tal, 1978 ;Lauchli & Wieneke, 1979 ;Rush & Epstein, 1981 ;Jeschke, 1984 ;Guerrier, 1996). However, here, control plants were grown with 10 mM NaCl and their older leaves contained 15-20 µmol g −" f. wt Na + or Cl − .…”

Section: Cationic Nutrientsmentioning

confidence: 73%

Effects of salinization on nutrient transport to lettuce leaves: consideration of leaf developmental stage

Lazof

Bernstein

1999

New Phytologist

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Most recent reviews of plant salinity response have included the concept of a nutritional disturbance as one likely mechanism by which shoot growth might be inhibited. None the less, few studies of dicotyledonous plants have presented data on nutrient transport into the most intensively growing shoot tissues. In this paper net nutrient deposition was followed for 3 d in 8 sequential, growing leaves of Lactuca sativa, which were grown either in conditions of moderate salinization, or in a growth-stimulating concentration of NaCl. The nutrient deposition was studied from 0.7 to 3.7 d following completion of stepwise salinization. This deposition was followed in immature leaves, which had attained only 1-2 % of ultimate leaf mass by the completion of the study. In such young leaves development is still dominated by cell division. The transport of Ca# + specifically to the youngest leaves was reduced by more than twice as much as was K + transport. Transport of the other major divalent cationic nutrient, Mg# + , was not decreased for these leaves. The factors of increase for Na + and Cl − after 3.7 d after completion of salinization averaged 152 and 62 % over control levels for the three youngest leaves (for Na + and Cl − , respectively). Though significant, these increases were only 27 and 14 % as great as increases in three leaf sets of more developed growing leaves. Decreases in net K + deposition and leaf K + concentration were not greater for the youngest than they were for the oldest leaves. Net S deposition was reduced 44 % more in younger than older growing leaves, but for most leaves not beyond the level expected due to reduced sink strength. The reduction in net P deposition also seemed more related to reduced sink strength, but was reduced to approx. 50 % in both younger and more developed growing leaves. While Fe concentration was not reduced by salinization at any developmental stage, Zn# + net transport and Zn concentration were both reduced in the two youngest leaves (57 and 70 %, respectively). Given the moderate treatment imposed (Na : Ca ratio of 22) the results suggest that Ca# + transport to the youngest leaves is probably highly sensitive to salinization of the root medium and is perhaps a key physiological response in the inhibition of leaf growth.

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Studies on growth and distribution of Na⁺, K⁺ and Cl⁻ in soybean varieties differing in salt tolerance

Cited by 133 publications

References 25 publications

Effects of Drought and Salinity on European Larch (Larix decidua Mill.) Seedlings

Effects of Drought and Salinity on European Larch (Larix decidua Mill.) Seedlings

Uptake and Distribution of Sodium and Potassium by Corn Seedlings

Effects of salinization on nutrient transport to lettuce leaves: consideration of leaf developmental stage

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