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Boron foliar application enhances oleuropein level and modulates volatile compound composition in olive leaves

Pasković, Igor, Soldo, Barbara, Talhaoui, Nassima, Palčić, Igor, Brkljača, Mia, Koprivnjak, Olivera, Majetić Germek, Valerija, Ban, Dean, Klanjac, Jana, Franić, Mario, Žurga, Paula, Grozić, Kristina, Lukić, Igor, Goreta Ban, Smiljana
Scientia horticulturae 2019 v.257 pp. 108688
Olea europaea, boron, disease resistance, farming systems, foliar application, greenhouses, insects, leaves, oleuropein, olives, pathogens, phenols, plantlets, volatile compounds
The present study investigated the effect of boron (B) foliar application on the dynamic changes in the concentration of phenols, especially oleuropein, and volatile compounds of olive leaves during a 90-day period. The trial was conducted in a greenhouse on one year old olive plantlets, sprayed with B at 41.62 mM against a water treated control. It was revealed that total phenols and oleuropein concentration in old and in young olive leaves increased in B treated leaves 90 days after application. Furthermore, B enhanced the concentration of particular terpene and norisoprenoid volatiles in olive leaf infusion. The obtained results may give a new perspective in biochemical farming practice, with a possibility to increase the amounts of phenols and terpenes in olive leaves intended for medical uses, and to enhance olive plant resistance to pathogens and insects.