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ŠUMARSKI LIST 11-12/2020 str. 47     <-- 47 -->        PDF

Our results are in concordance with Aldea et al. (2006) who recorded a decline in photosynthesis of remaining leaf tissue in understory oak saplings, while Schaffer et al. (1997) recorded significant correlation between the damage intensity and net photosynthesis of citrus attacked by leaf miners. Besides a direct reduction of photosynthesis due to less leaf mass, defoliation indirectly reduces photosynthesis and transpiration of leaves by causing damage to vasculatures that supply leaf tissues (Nabity et al., 2009). Decrease of both photosynthesis and stomatal conductance in our study supported the above-mentioned hypothesis. On the other hand, Meyer and Whitlow (1992) found no alteration in photosynthesis and stomatal conductance in goldenrod under attack of leaf beetle, although significant increases in