Use of greenhouse-covering films with tailored UV-B transmission dose for growing 'medicines' through plants: rocket salad case

Journal of the Science of Food and Agriculture
Pasquale MormileAlberto Ritieni

Abstract

The effects of ultraviolet B (UV-B) radiation on plants are well known and have recently attracted a great deal of attention due to the production of large quantities of secondary metabolites, which are very beneficial for human health. Recent studies have demonstrated the possibility of exploiting UV-B radiation to induce metabolic changes in fruit, vegetables, and herbs. The role of UV-B rays in inducing secondary plant metabolites is enhanced by new plastic films, which, as a result of their optical properties, permit the necessary dosage of UV-B to be transmitted into the greenhouse to stimulate such metabolites without altering the harvest. The main goal of the present paper is to demonstrate that, by using a greenhouse plastic film with appropriate transmittance of UV-B for rocket salad cultivation, it is possible to increase the nutraceutical elements in comparison with the same species grown in absence of such radiation. Tests compared nutritional elements extracted from rocket salad grown under greenhouses covered with several plastic films differing in UV-B transmittance. We found that rocket salad grown under plastic with 27% UV-B transmittance exhibited very high luteolin and quercetin content in comparison with roc...Continue Reading

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