Foliar application of glycinebetaine—a novel product from sugar beet—as an approach to increase tomato yield
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P. Mäkeläa, K. Jokinenb, M. Kontturic, P. Peltonen-Sainioa, E. Pehua and S. Somersaloa, *
a Department of Plant Production, University of Helsinki, P.O. Box 27, FIN-00014 Helsinki, Finland
b Cultor Ltd. Finnsugar Bioproducts, P.O. Box 105, FIN-00241 Helsinki, Finland
c Institute of Crop and Soil Sciences, Agricultural Research Centre, FIN-36100 Jokioinen, Finland
Received 6 August 1996;
accepted 16 December 1996.
Available online 19 February 1998.
Abstract
Glycinebetaine, a novel product from sugar beet (
Beta vulgaris L. v.
altissima), is purified from molasses during sugar processing through chromatographic separation, enrichment and crystallisation. Glycinebetaine is environmentally safe, non-toxic and water-soluble and is found in animal, microbe and plant cells. Most halophytes, when grown under stress, synthesise glycinebetaine in their chloroplasts and accumulate it as an osmoprotectant. Here we show that foliarly applied glycinebetaine offers a new possibility to stabilise crop production under field conditions: fruit yield of tomato plants (
Lycopersicon esculentum Mill.) grown in saline soils or exposed to high temperatures in California increased up to 39% when glycinebetaine was applied during midflowering. Similarly, glycinebetaine treatment of tomato plants in a commercial vegetable producer's greenhouse in Southern Finland increased the yield and the number of tomato fruits. In a separate greenhouse experiment, we showed that glycinebetaine application increased the rate of net photosynthesis of adequately watered and salt stressed tomato plants.