Effect of temperature on quinclorac-induced ethylene production from corn leaves

Effect of temperature ethylene evolution from corn leaves, which was induce d by on the herbicide quinclorac (3,7-dichloro-8-quinolinecarboxylic acid), was investigated. The results indicated that not only the temperature afte r quinclorac treatment but also that prior to the treatment significantly i nfluenced the quinclorac-induced ethylene production from corn leaves. Furt hermore, a rapid cooling (from 30 degrees C to 20 degrees C) caused suppres sion of quinclorac-induced ethylene production, depending on the cumulative temperature after the herbicide-application. On the contrary, a rapid warm ing (from 20 degrees C to 30 degrees C) during quinclorac application incre ased significantly the ethylene production more than the estimates accounte d for by the cumulative temperature; suggesting that a rapid warming may in crease the amount of ethylene biosynthesis enzyme induced by quinclorac und er light exposure.