Starch synthesis in potato (Solanum tuberosum) tubers: Activity of selected enzymes in dependence of potassium content in storage tissue

Lindhauer, Meinolf Georg; Fekete, M. A. R. de

doi:10.1007/bf00009275

Cited by 19 publications

(6 citation statements)

References 7 publications

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“…Earlier Flowers and Dalmond (1992) have shown that protein synthesis in halophytes and glycophytes had different requirements for essential nutrients such as K and Mg, with the later impacting the polysome translocating system. Another evidence comes from the observation that starch synthetase, an enzyme that tightly binds K + ions, was found to have a requirement of about 50 mM K + for the normal activity (Lindhauer & De Fekete, 1990), and surprisingly this is the minimal K + threshold that was recorded for all NaCl levels of the range (200–1000 mM) used here. The latter study also revealed that similar sized cations such as Rb + and Cs + being about 80% as effective as K + , while the replacement with Na + only brought about 20% of the overall enzyme activity.…”

Section: Discussionmentioning

confidence: 65%

Understanding the mechanistic basis of adaptation of perennial Sarcocornia quinqueflora species to soil salinity

Ahmed

Shabala

2021

Physiologia Plantarum

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Succulent halophytes can be used as convenient models for understanding the mechanistic basis of plant adaptation to salt stress. In this work, effects of salinity (0-1000 mM NaCl range) on growth, ion accumulation, and stomatal features were investigated in the succulent halophyte Sarcocornia quinqueflora. Elevated salinity levels up to 400 mM NaCl largely promoted dry matter yield, succulence, shoot surface area, and stomatal characteristics. Plant growth was optimal at 200 mM NaCl and reduced at concentrations exceeding 600 mM NaCl. Osmotic adjustment in a

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Section: Discussionmentioning

confidence: 65%

Understanding the mechanistic basis of adaptation of perennial Sarcocornia quinqueflora species to soil salinity

Ahmed

Shabala

2021

Physiologia Plantarum

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“…Within cells K is required for many physiological functions, including osmoregulation, enzyme activation and membrane transport processes (White and Karley 2010). Nitsos and Evans (1969) first observed that starch synthesizing enzymes have a specific requirement for K and about 1.8% of K (as a proportion of DM) is critical for high starch concentrations in potatoes (Forster and Beringer 1983;Lindhauer and De Fekete 1990). However, tuber K concentrations above 2% DM were found to reduce starch content (Marschner and Krauss 1980), which could be explained in terms of an osmotic optimum for starch synthesis (Oparka and Wright 1988).…”

Section: Discussionmentioning

confidence: 99%

Variation in tuber mineral concentrations among accessions of Solanum species held in the Commonwealth Potato Collection

Subramanian

White

Broadley

et al. 2017

Genet Resour Crop Evol

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Abstract:The variation in tuber mineral concentrations amongst accessions of wild tuber-bearing Solanum species in the Commonwealth Potato Collection (CPC) was evaluated under greenhouse conditions. Selected CPC accessions, representing the eco-geographical distribution of wild potatoes, were grown to maturity in peat-based compost under controlled conditions. Tubers from five plants of each accession were harvested, bulked and their mineral composition analysed. Among the germplasm investigated, there was a greater range in tuber concentrations of some elements of nutritional significance to both plants and animals, such as (Ca, Fe and Zn; 6.7, 3.6, and 4.5-fold respectively) than others, such as (K, P and S; all <3-fold). Significant positive correlations were found between mean altitude of the species' range and tuber P, K, Cu and Mg concentrations. The amount of diversity observed in the CPC collection indicates the existence of wide differences in tuber mineral accumulation among different potato accessions. This might be useful in breeding for nutritional improvement of potato tubers. Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation AbstractThe variation in tuber mineral concentrations amongst accessions of wild tuber-bearing Solanum species in the Commonwealth Potato Collection (CPC) was evaluated under greenhouse conditions. Selected CPC accessions, representing the eco-geographical distribution of wild potatoes, were grown to maturity in peat-based compost under controlled conditions. Tubers from five plants of each accession were harvested, bulked and their mineral composition analysed. Among the germplasm investigated, there was a greater range in tuber concentrations of some elements of nutritional significance to both plants and animals, such as (Ca, Fe and Zn; 6.7, 3.6, and 4.5-fold respectively) than others, such as (K, P and S; all <3-fold). Significant positive correlations were found between mean altitude of the species' range and tuber P, K, Cu and Mg concentrations. The amount of diversity observed in the CPC collection indicates the existence of wide differences in tuber mineral accumulation among different potato accessions. This might be useful in breeding for nutritional improvement of potato tubers.

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“…Inorganic P was positively correlated with the reducing sugar concentration in the stem portion of the tuber. Starch synthesizing enzymes have a specific requirement for K (24) and tubers depend upon a dynamic supply of K for highest starch content (19). About 1.8% K in the tuber dry matter is necessary for high starch concentrations but higher K concentrations tend to decrease starch concentrations (10).…”

Section: )mentioning

confidence: 99%

Nitrogen and potassium fertilization of potatoes: Sugars and starch

Westermann¹,

James

Tindall

et al. 1994

American Potato Journal

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Considerable evidence exists that both N and K influence potato (Solanum tuberosum L.) yields and quality. The impact of nutrients on tuber quality parameters under field conditions should be identified so optimum management practices can be utilized. We evaluated the N and K fertilization by Ksources effects on concentrations of nutrients, reducing sugars, sucrose and starch in the stem and apical tuber ends from two irrigated field experiments with the Russet Burbank cultivar. Nitrogen rates of 0, 112, 224 or 336 kg ha-' were combined with selected K rates of 0, 112, 224 or 448 kg ha-' as either KCI or K2SQ4 arranged as an incomplete factorial. A multiple linear regression model was fit to the data and used to predict the response surface for a complete factorial for each K-source. Nitrogen applications increased or decreased reducing sugars in the apical and stem ends, respectively. Potassium decreased reducing sugars in both tuber ends. Sucrose was higher in the apical end than in the stem end but was not appreciably affected by fertilizer treatment. Nitrogen and potassium applications reduced dry matter and starch concentrations in both tuber ends. Potassium had a smaller effect on the apical end when starch was expressed on a dry weight basis, indicating that increased water content was a factor in the K effect. Both N and K concentrations in the tuber ends were negatively related to starch concentrations, but the relationship was different for the apical and stem ends. Tuber Cl concentration indirectly affected starch concentrations in the stem end when KCL was applied. The K fertilization effect on specific gravity depended upon the K concentration in the harvested tuber and was independent of K fertilizer source. These data illustrate the effects of preplant N and K fertilization rates on final tuber quality parameters. Additional studies are needed to further define the effects of nutrient concentrations at different plant growth stages. CompendioExiste considerable evidencia que tanto el N coma el K influencian los rendimientos y calidad de la papa (Solanum tuberosum L. campo, debe ser identificado de modo que pueden utilizarse practicas Optimas de manejo. Se evaluO la fertilizaciOn con N y K por los efectos de las fuentes de K sobre la concentraciem de nutrientes, los aplcares reductores, sucrosa y almidem en los extremos apical y terminal de tuberculos de dos experimentos de campo bajo irrigaciem, con el cultivar Russet Burbank. Se combinaron dosis de 0, 112, 224, o 336 kg ha' de N, con dosis seleccionadas de K de 0,112, 224 o 448 kg ha'', sea comb KC1 o como K2SO4, dispuestas como un factorial incompleto. Se dispuso la information convenientemente en un modelo de regresiOn linear multiple y se le utilizO para pronosticar la superficie de respuesta para un factorial completo para cada fuente de K. Las aplicaciones de N incrementaron o disminuyeron los azikares reductores en los extremos apical y terminal, respectivamente. El K redujo los azficares reductores en ambos extremos del tuberculo....

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Starch synthesis in potato (Solanum tuberosum) tubers: Activity of selected enzymes in dependence of potassium content in storage tissue

Cited by 19 publications

References 7 publications

Understanding the mechanistic basis of adaptation of perennial Sarcocornia quinqueflora species to soil salinity

Understanding the mechanistic basis of adaptation of perennial Sarcocornia quinqueflora species to soil salinity

Variation in tuber mineral concentrations among accessions of Solanum species held in the Commonwealth Potato Collection

Nitrogen and potassium fertilization of potatoes: Sugars and starch

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