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Photobiological Control of Crop Production and Plant Diseases

Kiriakos Kotzabasis

a,

*, Eleni Navakoudis

a

, and Demetrios J. Vakalounakis

b

a Department of Biology, University of Crete, P. O. Box 2208, 71409 Heraklio, Crete, Greece.

Fax: +30 28 10 39 44 08. E-mail: kotzab@biology.uoc.gr

bPlant Protection Institute, National Agricultural Research Foundation (N.AG.RE.F.), P.O. Box 2228, 71003 Heraklio, Crete, Greece

* Author for correspondence and reprint requests

Z. Naturforsch.63 c, 113Ð123 (2008); received May 21/July 4, 2007

Plants, as well as fungi, use ambient sunlight as information to regulate photomorphoge- netic processes. The photobiological control of this information showed that the development of photobiological greenhouse plastic covers simulates a photonic information that leads to a physiological enhancement of plant productivity and fungal disease control, thus minimiz- ing the need for the use of agrochemicals. The main characteristics of these photobiological greenhouse plastic covers are the high transmission of photosynthetically active radiation (PAR, 400Ð700 nm) combined with an increase of the factorζ= RL(655Ð665 nm)/FRL(725Ð735 nm), which affects the cellular phytochromic equilibrium Φ= Pfr/(Pfr + Pr) and regulates the photo- synthetic activity and therefore the plant productivity. Additionally, increase of the spec- tral ratios from the transmitted light: BL(420Ð500 nm)/nearUV(290Ð370 nm) and BL(420Ð500 nm)/ FRL(725Ð735 nm), cause mainly the induction of biochemical, physiological and morphological responses, regulated by cryptochromes in plants (e. g.inflorescence and infructescence) and mycochrome in fungi (e. g.inhibition of sporulation). In the present work, comparative stud- ies with randomly selected greenhouse plastics showed that small changes in the above- mentioned “photobiological” parameters raise the productivity of tomato plants and inhibit the sporulation of several isolates of the fungal pathogenBotrytis cinerea. Thus, a model for the photoregulation of these two phenomena in greenhouses is proposed.

Key words:Fungal Sporulation, Photobiological Greenhouse Covers, Plant Production

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