Effects of three types of wound on photosynthetic activity of Populus simonii × P. pyramidalis ‘Opera 8277’ seedlings

The effect of three types of wound treatment, i.e. methyl jasmonate (MeJA) fumigation, mechanical wounding and herbivory by Clostera anachoreta, on photosynthesis of oneyearold potted Populus simonii× P. pyramidalis ‘Opera 8277’ seedlings were investigated. The results indicated that the net photosynthetic rate (Pn) decreased significantly under all treatments. Pn decreased more as a result of mechanical wounding and MeJA fumigation than of herbivory. The decrease of Pn with mechanical wounding was caused by stomatal limitation, while those with MeJA fumigation and herbivory were due to nonstomatal limitations. The maximum efficiency of Photosystem II (Fv/Fm) was temporarily impaired after treatments. There was no statistically significant difference in photochemical quenching (qp) and nonphotochemical quenching (NPQ), suggesting that the damage to the action center of PS II is reversible. 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