Induction effects of jasmonic acid on tannin content and defense-related enzyme activities in conventional cotton plants TIMING AND CONCENTRATION EFFECTS ON THE DEFENSE RESPONSE OF ZEA MAYS SEEDLINGS AFTER APPLICATION OF JASMONIC ACID TO LEAVES Relationship between Lipoxygenase and ABA and JA in Wounded Signal Transduction of Heathy Populus Seedlings Role of silicon in regulating plant resistance to insect herbivores Timing- and concentration effect of belowground treatment with jasmonic acid on maize seedlings chemical defense response.