Causality analysis on cascades of reactions in the induced defense mechanism of rice plant. Part VII. Dependence on ethylene of the induction of peroxidase and lipoxygenase activity in rice leaf infected with blast fungus.
Year: 1990
Type: article
Abstract: Rice leaf POX (EC 1.ll.1.7)and LOX(EC 1.13.ll.12) activities were induced by press-injured application of ETP, an ethylene generating chemical, ACCand Glu.A higher concentration of Glu was required to induce rice leaf POXwhen compared with the induction of LOXand the previously reported case of PAL.Both the POXand LOXactivities were induced by press-injured inoculation with incompatible or compatible blast fungus conidia, or by press-injured application of its RIF.The induction of POXby press-injured inoculation of incompatible conidia, compatible conidia or RIF was inhibited by a preapplication of TR, AOA, CY or ABA, while the induction of LOXwas similarly inhibited by the former three, but not at all, or only weakly inhibited by ABA.The activity itself of induced POXor LOXwas not inhibited by the inhibitors used in this experiment.The enzyme induction spectra either by the incompatible or compatible combination in terms of tm (the time to the maximum rate of induction after inoculation) showed good orderliness (Oj FES<PAL< LOX< POX)with the relaxation in compatible combination.A higher outbreak of rice blast was observed when rice seedlings were pretreated with TR, AOAor ABA4hr before the spray inoculation.471
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W1492077043