Changes in Ethylene Production and in 1-Aminocyclopropane-1-carboxylic Acid (ACC) and Malonyl-ACC Contents of Cocklebur Seeds during Their Development

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Ethylene production in developing cocklebur (Xanthium pennsylvanicum Wallr.) seeds peaked when the dry weight of the seeds began to increase in the early period of development. The production then began to decrease and stopped when the dry weight increase was completed. The upsurge of ethylene production in the early developmental period paralleled increases in ACC synthase activity and the l-aminocyclopropane-l-carboxylic acid (ACC) content of the seeds, both of which rapidly decreased later. Malonyl-ACC (MACC) accumulated in developing cocklebur seeds during the early period of development, before the ACC content and ethylene production increased. Although the ACC synthase activity, ACC content and ethylene production showed marked decreases, the MACC content remained almost unchanged during the middle period of seed development, with a pronounced decrease occurring in the late period. Exogenous application of MACC did not promote ethylene production of seeds collected at the late developmental stage. Aminoethoxyvinylglycine, an inhibitor of ACC synthase, strongly inhibited the ethylene production of the same lot of seeds. Therefore, the decrease in the MACC content in developing cocklebur seeds was not due to reuse of MACC for ethylene production.
日本植物生理学会の論文