Calcium and bicarbonate effects on the growth and nutrient uptake of burley tobacco seedlings: Hydroponic culture<sup>1</sup>

Pearce, Robert C.; Li, Yongmei; Bush, Lowell P.

doi:10.1080/01904169909365696

Cited by 30 publications

(12 citation statements)

References 8 publications

(12 reference statements)

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“…These factors lead to reduced root growth (Bingham and Stevenson 1993;Alhendawi et al 1997) and the precipitation of other mineral ions, which decreases the availability of essential nutrients (Shi and Zhao 1997;Li et al 2010;Gong et al 2014). Shoot development is also indirectly but significantly inhibited because stressed plants produce smaller leaves (Pearce et al 1999). Consequently, growth and photosynthesis are negatively affected by alkaline conditions (Yang et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Comprehensive evaluation of tolerance to alkali stress by 17 genotypes of apple rootstocks

Zhang

Wen

Dong

et al. 2016

Journal of Integrative Agriculture

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Alkaline soils have a great influence on apple production in Northern China. Therefore, comprehensive evaluations of tolerance to such stress are important when selecting the most suitable apple rootstocks. We used hydroponics culturing to test 17 genotypes of apple rootstocks after treatment with 1:1 Na 2 CO 3 and NaHCO 3. When compared with the normally grown controls, stressed plants produced fewer new leaves, and had shorter roots and shoots and lower fresh and dry weights after 15 d of exposure to alkaline conditions. Their root/shoot ratios were also reduced, indicating that the roots had been severely damaged. For all stressed rootstocks, electrolyte leakage (EL) and the concentration of malondialdehyde (MDA) increased while levels of chlorophyll decreased. Changes in root activity (up or down), as well as the activities of peroxidase (POD), superoxide dismutase (SOD), and catalase (CAT) were rootstock-dependent, possibly reflecting their differences in alkali tolerance. Using an alkali injury index (AI), coefficients of adversity resistance (ARC), cluster analysis, and evaluation of their physiological responses, we classified these 17 genotypes into three groups: (1) high tolerance: Hubeihaitang,

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Section: Introductionmentioning

confidence: 99%

Comprehensive evaluation of tolerance to alkali stress by 17 genotypes of apple rootstocks

Zhang

Wen

Dong

et al. 2016

Journal of Integrative Agriculture

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“…This opposite trend does not agree with Pearce et al (1999). In the cited reference, however, bicarbonate was added as NaHCO 3 , so bicarbonate was directly associated with the salinity level.…”

Section: Bicarbonate and Phmentioning

confidence: 49%

A model for nutrient and water flow and their uptake by plants grown in a soilless culture

Silberbush

Ben‐Asher

2005

Plant Soil

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The objective of this study was to develop a sensitive means of control to optimize nutrient concentrations in the root zone of a soilless system, considering plant water and nutrient uptake, and solution circulation rates. A model is proposed to simulate ornamental plants' growth in a channel with a non-interacting soilless substrate, irrigated by point sources with constant discharge rates, spaced uniformly along the channel. The model accounts for compensation for transpiration water losses and consequent salinity buildup, and its interactions with plant growth and nutrient uptake. The added water may contain given concentrations of nutrients and/or toxic (saline) compounds, which would cause salinity buildup. Uptake of each solute is specific, according to a Michaelis-Menten kinetics mechanism, but passive uptake by the transpiration stream is also accounted for. Plant growth is affected by time/ age and ionic balance in the solution. The model was calibrated with lettuce (Lactuca sativa L.) plants grown in volcanic ash. Simulation of potassium concentration change as a result of discharge rate and emitter spacing revealed that the two parameters could compensate one for the other, once a target lower limit is set. Potassium appeared to be most sensitive to sodium accumulation in the growth medium; this accumulation changed ionic concentration balance, which affected pH and bicarbonate concentration. Passive uptake of calcium by the transpiration stream is highly affected by the root fraction involved, but its calculated contribution is below published values is highly affected by the root fraction involved, but its calculated contribution is below published values.Abbreviations: LAI -leaf area index; NFT -nutrient film technique; RL -root length

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“…The data presented here lend strong support to Mengel's hypothesis (Mengel, 1994) that bicarbonate is transported radially into the root stele and subsequently into the leaves leading to an increase in apoplastic pH; additional alkalinization may come from bicarbonate uptake by bundle sheath cells via a symport with protons, as suggested previously for mesophyll cells of various C3 species by Savchenko et al (2000). It is generally accepted that an alkalinization of the leaf apoplast would inhibit reduction of Fe III to Fe II and thus hamper Fe uptake by the cells Rö mheld, 1999, 2002); it may also be relevant for Zn nutrition (Pearce et al, 1999). Rigorous testing of these hypotheses requires further experimentation with the xylem pH probe on leaves, e.g.…”

Section: Resultsmentioning

confidence: 99%

Bicarbonate-Induced Alkalinization of the Xylem Sap in Intact Maize Seedlings as Measured in Situ with a Novel Xylem pH Probe

Wegner¹,

Zimmermann²

2004

Plant Physiology

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In higher plants the pH of the xylem sap plays an important role in drought signaling, growth regulation, and plant nutrition. However, the interpretation of the data is very controversial. The main reason for this is that the xylem pH in intact plants was not directly accessible hitherto. We present here a novel, minimally-invasive probe based on the xylem pressure-potential probe (used for measuring directly xylem pressure and the electrical potential between root xylem sap and medium). Singletipped, double-barreled capillaries were used, one barrel served as H 1 -selective electrode, whereas pressure and electrical potential were recorded by the other one. Upon insertion of the probe into the root xylem of maize (Zea mays) seedlings, pH values ranging between about 4.2 and 4.9 were monitored when the roots were immersed in standard nutrient solution. The pH did not respond to changes in light irradiation (up to 300 mmol m 22 s 21 ), but increased upon exposure of the root to 5 or 20 mM bicarbonate in the bath solution. Changes in pH could also be recorded in transpiring plants when the root was cut below the insertion point of the probe and placed in media with different pH. The data support the hypothesis of Mengel ([1994] Plant Soil 165: 275-283) that upon external supply with bicarbonate Fe is immobilized in the leaf apoplast via changes in xylem pH.

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Calcium and bicarbonate effects on the growth and nutrient uptake of burley tobacco seedlings: Hydroponic culture¹

Cited by 30 publications

References 8 publications

Comprehensive evaluation of tolerance to alkali stress by 17 genotypes of apple rootstocks

Comprehensive evaluation of tolerance to alkali stress by 17 genotypes of apple rootstocks

A model for nutrient and water flow and their uptake by plants grown in a soilless culture

Bicarbonate-Induced Alkalinization of the Xylem Sap in Intact Maize Seedlings as Measured in Situ with a Novel Xylem pH Probe

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Calcium and bicarbonate effects on the growth and nutrient uptake of burley tobacco seedlings: Hydroponic culture1

Cited by 30 publications

References 8 publications

Comprehensive evaluation of tolerance to alkali stress by 17 genotypes of apple rootstocks

Comprehensive evaluation of tolerance to alkali stress by 17 genotypes of apple rootstocks

A model for nutrient and water flow and their uptake by plants grown in a soilless culture

Bicarbonate-Induced Alkalinization of the Xylem Sap in Intact Maize Seedlings as Measured in Situ with a Novel Xylem pH Probe

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Calcium and bicarbonate effects on the growth and nutrient uptake of burley tobacco seedlings: Hydroponic culture¹