Abstract
Methyl jasmonate (JA-Me) at 10−3 M completely inhibited Amaranthus caudatus seed germination. Exogenous ethylene could totally reverse this inhibition. The inhibitor of ethylene action, 2,5-norbornadiene (NBD), increased the sensitivity of seeds to JA-Me. Methyl jasmonate inhibited ethylene production and also decreased both 1-aminocyclopropane-1-carboxylic acid (ACC) and malonyl ACC (MACC) content. Likewise, ACC oxidase activity in vivo was decreased by jasmonate. Similarly ACC oxidase activity in vitro isolated from seeds incubated in the presence of JA-Me was lower than that isolated from untreated seeds.
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