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Isocitric Lyase and Isocitric Dehydrogenase in Germinating Lettuce (1968)

Mayer, A. M. ; Krishmaro, N. ; Poljakoff-Mayber, A.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 21 (1968), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: A soluble isocitric lyase is shown to occur in lettuce seeds. Its activity increases during germination till 72 hours and then falls again. No particulate lyase could be detected. In addition both a soluble and a particulate isocitric dehydrogenase is present in the seeds. Both enzymes react with NAD as well as with NADP. The soluble enzyme drops sharply in activity during germination, while the particulate enzyme remains at a more or less constant level of activity. By gel electrophoresis the isocitric lyase and the isocitric dehydrogenase were shown to consist of what appear to be several isozymes. The interrelation between the enzymes and their relation to fat metabolism during germination is discussed. Evidence is brought for an enzymic reaction by which isocitric acid is converted to pyruvic acid. The nature of this reaction is not clear.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1968.tb07242.x

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Effect of antitranspirant treatment on the water balance of pine seedlings, under different climatic and soil moisture conditions (1966)

Gale, J. ; Poljakoff-Mayber, A. ; Nir, I. ; [et al.]

Springer

Plant and soil 24 (1966), S. 81-89

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ISSN: 1573-5036

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary Antitranspirant treatment with ‘Tag’ — a polyethylene based emulsion-reduced transpiration and increased height of potted pine seedlings under simulated hot and dry conditions when soil was moist. Under cool, humid conditions reduction of transpiration was very much less and growth was slightly reduced. Application of antitranspirants to pine seedling transplants, under hot dry field conditions, failed to improve, their water balance or to reduce mortality. Physiological tests made during the field trial and experiments with potted seedlings showed that when the soil is dry xeromorphic plants efficiently reduce their water loss and under such conditions anti-transpirants are of no benefit. It is calculated that antitranspirants would only be advantageous under moist soil and high evaporative demand conditions.