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| ŠUMARSKI LIST 11-12/2020 str. 43 <-- 43 --> PDF |
Physiological responses of two pedunculate oak (Quercus robur L.) families to combined stress conditions – drought and herbivore attack Fiziološki odgovor dvije familije hrasta lužnjaka (Quercus robur L.) na kombinaciju stresa – suša i defolijatori Andrej Pilipović, Milan Drekić, Srđan Stojnić, Nataša Nikolić, Branislav Trudić, Marina Milović, Leopold Poljaković-Pajnik, Milan Borišev, Saša Orlović Summary Pedunculate oak (Quercus robur L.) is economically and ecologically one of the most important tree species in lowland forests of Southeastern Europe, and it is endangered by numerous biotic and abiotic factors. In this study, we investigated the effect of drought and herbivore attack of gypsy moth (Lymantria dispar L.) on two families of young oak seedlings subjected to the following treatments: drought (D); gypsy moth (GM); both drought and gypsy moth (D+GM) and control (Ø) for a period of 15 days followed by a 7-day recovery period. During both treatment and recovery, physiological parameters - net photosynthesis (A), transpiration (E), stomatal conductance (gs), sub-stomatal CO2 concentration (Ci), water use efficiency (WUE), nitrate reductase activity (NRA) and chlorophyll content (Chl) were measured. Our results showed significant effects of stress factors on physiological processes in oak seedlings which could have potential impact on forest regeneration. Also, differences in the reaction between investigated families indicated the need for breeding and selection of more resistant progenies and provenances of pedunculate oak. Key words: pedunculate oak, photosynthesis, WUE, SPAD, nitrate reductase activity Introduction Uvod As one of a vast number of oak species, pedunculate oak (Quercus robur L.) is a species with a wide geographic distribution, starting from western Asia to Europe with reported scattered stands in Mediterranean regions (Gil Sanchez et al., 1994) that grow along the valleys of the major rivers in clear stands or mixed communities with narrow-leaved ash, hornbeam and elms. The pedunculate oak forests in regions of Slavonia and Srem in Western Balkans are well known all over the world for their valued quality wood for different industrial purposes. Nowadays climate change and regulation of watercourses significantly affect the |