Rapid Effects on Ion and Water Uptake Induced by Changes of Water Potential in Young Wheat Plants

Erlandsson, Gunvor

doi:10.1111/j.1399-3054.1975.tb03903.x

Cited by 35 publications

(18 citation statements)

References 21 publications

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“…In general, water stress reduces nutrient uptake by roots and transport from roots to shoots, due to restricted transpiration rates and membrane permeability (Erlandsson, 1975). However, it has been indicated that K inflow was not limited by soil water content in maize (Mackay and Barber, 1985), and plant nitrogen concentration increased with water stress in pearl millet (Payne et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Responses of Papaya Seedlings (Carica papaya L.) to Water Stress and Re-Hydration: Growth, Photosynthesis and Mineral Nutrient Imbalance

2006

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The effects of water stress and subsequent re-hydration on growth, leaf abscission, photosynthetic activity, leaf water potential and ion content were investigated in papaya seedlings (Carica papaya L.) cv. ''Baixinho de Santa Amalia''. Water stress was imposed by suspending irrigation during 34 days. Thereafter, plants were regularly re-watered. Drought arrested plant growth, induced leaf abscission and drastically decreased photosynthetic rate. However, leaf water potential was hardly reduced. Water deficit also induced sodium, potassium and chloride accumulation in leaves and roots, and did not modify nitrogen levels in both organs. Re-hydration stimulated growth, promoted emergence of new leaves, reactivated photosynthetic machinery function and reduced ion content to control levels. The results indicated that the ability of papaya plants to improve drought tolerance is not mediated through the reduction of leaf abscission, the detention of growth or the decrease of net CO 2 assimilation. In contrast, the data suggested that under water stress conditions these plants appear to posses a certain capacity to increase ion content, which might contribute to osmotic adjustment.

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Section: Introductionmentioning

confidence: 99%

Responses of Papaya Seedlings (Carica papaya L.) to Water Stress and Re-Hydration: Growth, Photosynthesis and Mineral Nutrient Imbalance

2006

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“…An instant decrease in uptake of (*^Rb) potassium. and water resulted when the water potential of a root medium was rapidly decreased by the addition of PEG (Erlandsson 1975). Increasing the humidity around the shoots from about 60 to about 100% RH increased the uptake of ions.…”

Section: Introductionmentioning

confidence: 99%

Efflux of Potassium from Wheat Roots Induced by Changes in the Water Potential of the Root Medium

Erlandsson

1979

Physiologia Plantarum

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Effects of rapid or stepwise decrease of the water potential by polyethylene glycol in the root medium on the efflux and uptake of **Rb-potassium, and the effect of abscisic acid on the efflux of ^^Rbpotassium were investigated in roots of intact wheat plants (Triticum aestivum L. cv. Welbulls Original Starke II). The efflux of ions increased at both a rapid and a stepwise reduction in water potential, but the effect was less at a stepwise reduction in water potential. Active uptake of ions decreased as much at a stepwise as at a rapid reduction in water potential. Addition of 4 x 10"-M abscisic acid to the root medium did not affect the efflux of ions. It is suggested that low water potentials affect both membrane permeability and active uptake of ions. The increase of efflux is not induced by increase of ABA only. 0O31-9317/79/05OOOl-O6$O3.OO/O © 1979 Physiologia Plantarum GUNVOR ERLANDSSON Physiol. Plant. 47. 1979

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“…Levitt 1980;Kramer 1980, Tanguiling et al 1987). The reduction in GY of water-stressed plants at Gf stage may have been caused by the limitation of rooting depth (Cutforth et al 1986, Jama andOttman 1993) and to the lack of available water that might impede the mobihty of ions, either by mass flow (Power 1983) or by root interception (Erlandsson 1975). Since nutrient uptake is closely linked to soil water status, it is expected that a decline in available soil moisture might decrease the diffusion rate of nutrients from soil matrix to roots (Barber 1962, Marais andWeirsma 1975).…”

Section: Discussionmentioning

confidence: 99%

Water Stress and N Fertilization Effects on Yield and Smut Disease Incidence in Corn (Zea mays L.)

Kostandi

Soliman

1998

J Agronomy Crop Science

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A 2-year field experiment was conducted in sandy clay loam soil to quantify the single and combined effects of N fertilization and water stress (WS) treatments on yield and smut incidence in corn. The plants were supplied with two different N rates (225 and 300kg ha"') and subjected to 2 weeks' water stress, imposed at vegetative {Vg], tasselling (Ta), silking (Si) and grain-filling (Gf) growth stages, (n addition, a control treatment (Cr) was also included to allow the plants to grow under unstressed conditions. The plants were artificially infected two times with Ustilago tnavdis spores and smut severity was recorded. At harvest, grain yield (GY), total biomass (Tbm) and harvest index (HI) were determined in smutfree (0) and smutted plants (S). Results have shown that GYo and GYs were markedly reduced when the plants were subjected to WS. The depressing effects of WS were, comparatively, high at Gf, intermediate at Ta and Si. and low at Vg growth stages. Smut index (SI) data revealed that severity was higher on plants stressed at Gf than those exposed to WS at Vg, Ta or Si stages. Considerable variations were detected on Tbm and H] of smut-free and smutted plants, indicating the detriniental effect of plant water deficit at Gf stage. The combined effect of WS and N on Tbmj showed mixed results, ranging from positive response for stressed plants at Si and Gf to little response at Cr, Vg or Ta stages at higher N rate. Although the effect of WS exposure on RYL data was dominant at Gf, the rate of yield depression was relatively higher at Ta and Si than the other growth stages, because of water deficit effects. The results proved that N fertilization did not conclusively alleviate the depressing effect of WS on grain yield losses.

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Rapid Effects on Ion and Water Uptake Induced by Changes of Water Potential in Young Wheat Plants

Cited by 35 publications

References 21 publications

Responses of Papaya Seedlings (Carica papaya L.) to Water Stress and Re-Hydration: Growth, Photosynthesis and Mineral Nutrient Imbalance

Responses of Papaya Seedlings (Carica papaya L.) to Water Stress and Re-Hydration: Growth, Photosynthesis and Mineral Nutrient Imbalance

Efflux of Potassium from Wheat Roots Induced by Changes in the Water Potential of the Root Medium

Water Stress and N Fertilization Effects on Yield and Smut Disease Incidence in Corn (Zea mays L.)

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