Pyruvate kinase and a phosphatase as potential indicators of potassium and magnesium status of Tomato and Cucumber Plants

Besford, R. T.

doi:10.1002/jsfa.2740260202

Cited by 9 publications

(1 citation statement)

References 16 publications

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“…This view was supported by Dwivedi and Randawa (1974) also. The use of pyruvate kinase enzyme activity can be helpful in ensuring and diagnosing the optimal levels of potassium or magnesium even before the onset of visible deficiency symptoms (Besford 1975). Bar-Akiva et al (1976) suggest that pyruvate activity serve as a more objective and less emperical indicator of cation balance in plants.…”

Section: Biochemical Parameters As Assessment Tool For Nutrient Status Of Fruit Treesmentioning

confidence: 99%

Nutrient Deficiency Disorders in Fruit Trees and their Management

Chatterjee¹,

Dube²

Fruit and Vegetable Diseases

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The growth, development and productivity of fruit trees depend on several environmental and biotic factors. Among these factors nutrient imbalance also causes serious disorders in plants and as a result not only the yield but also quality of fruits is affected. To identify the disorders created by low or excess quantities of essential macro-and micro-nutrients, several techniques and methods have been specified which are helpful in recognizing and diagnosing the nutrient disorder(s) not only in fruit trees but also of the soil on which these are growing. Various particular parts of the fruit trees have been identified which are suggestive of nutrient status of the trees. On the basis of these, the deficient, sufficient and excess values have been worked out and are helpful in recouping such disorders. In hidden hunger conditions in addition to quantitative nutrient analysis, certain biochemical parameters also play an important role in specifying the disorder(s) specially in deficiency conditions. In abnormal nutrient conditions with the help of techniques, recovery in productivity has been obtained in several instances.To obtain sustenance in food production, the application of both inorganic fertilizers along with organic manures is essential.

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Section: Biochemical Parameters As Assessment Tool For Nutrient Status Of Fruit Treesmentioning

confidence: 99%

Nutrient Deficiency Disorders in Fruit Trees and their Management

Chatterjee¹,

Dube²

Fruit and Vegetable Diseases

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A phosphatase as a potential indicator of the phosphorus status of the glasshouse cucumber (Cucumis sativus)

Besford¹

1978

J Sci Food Agric

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Phosphoenolpyruvate, which is the substrate for the enzyme pyruvate kinase, is also hydrolysed by a phosphatase when the former enzyme is assayed in unpurified extracts from plant tissues. The activity of this phosphatase has been examined in extracts of cucumber leaves from plants receiving a wide range of N, P, K and Mg treatments. When assayed in the presence of added MgS04, the phosphatase activity was highly correlated with the P content in the leaves and was not affected by the variation in the N, K or Mg content in the leaves. While the pyruvate kinase activity in extracts of cucumber leaves can be used to indicate the K or Mg status of the plants, the associated phosphatase activity gives an indication of the P status. These enzyme assays which can be completed within 2 h, could offer a rapid means of assessment of the K, Mg and P status of cucumber plants.

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Nutrient imbalances in tomato plants and acid phosphatase activity in the leaves

Besford¹

1979

J Sci Food Agric

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Tomato plants were grown in sand for 5 weeks and received one of fifteen different nutrient solutions in which the concentrations of various elements were either reduced or increased individually, relative to their concentration in a complete nutrient solution, and the acid phosphatase activity in extracts from the young, fully-expanded leaves was determined. When expressed on a fresh weight basis, only in the P-deficient plants was the activity significantly increased with a degree of confidence better than P=O.O5; a slight increase occurred in extracts from the plants suffering from B toxicity, but this was only significant at P=O.1. There were no increases in acid phosphatase activity with deficiencies of N, K, Ca, Mg, B, Cu, Fe, Mn, Mo or Zn; or with toxicities of Cu, Mn or Zn. When expressed on a protein N basis, only N and P deficiencies increased the acid phosphatase activity. It is proposed that the acid phosphatase activity of the leaves could be used as an indicator of P deficiency in the tomato.

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Pyruvate kinase and a phosphatase as potential indicators of potassium and magnesium status of Tomato and Cucumber Plants

Cited by 9 publications

References 16 publications

Nutrient Deficiency Disorders in Fruit Trees and their Management

Nutrient Deficiency Disorders in Fruit Trees and their Management

A phosphatase as a potential indicator of the phosphorus status of the glasshouse cucumber (Cucumis sativus)

Nutrient imbalances in tomato plants and acid phosphatase activity in the leaves

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