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© 1972 Oxford University Press

RESEARCH-ARTICLE

Effects of Rapidly and Slowly Permeating Osmotica on Macromolecule and Sucrose Synthesis

H. GREENWAY, B. LANGE and MARGARET LEAHY

Agronomy Department, Institute of Agriculture, University of Western Australia Nedlands, W.A. 6009

Metabolic effects induced by low water potentials were separated from those induce by low turgor and hydration, by comparing responses of plant cells to rapidly and slowly permeating osmotica.

Metabolic processes selected for study were those which are claimed to be very sensitive to water deficits. ‘Glucose-stimulated’ respiration, and sucrose and starch synthesis, were measured in Chlorella pyrenoidosa and protein synthesis in vacuolated and non-vacuolated segments of Zea mays roots. Mannitol, a slowly permeating osmoticum, stimulated sucrose synthesis and reduced rates of other metabolic processes, including starch and protein synthesis. In contrast, metabolism changed little during exposure to low water potentials induced by ethylene glycol, which rapidly permeates cells.

The experiments demonstrated that water and solute potentials as low as—20 atm had only very small effects on metabolism, strongly suggesting that water deficits act principally via decreases in turgor and hydration.


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