Abstract
Summary When duckweed was grown in the presence of [35S, U-14C]-methionine the ratio of [14C]-4-carbon moiety relative to 35S in protein methionine was less than in the administered methionine. This decrease demonstrates a preferential recycling of the sulfur moiety relative to the 4-carbon moiety of methionine. This pathway probably plays a hitherto unsuspected general role in plants, such as in polyamine synthesis. The ratio of [14C]-methyl relative to 35S of protein methionine was also less than in the administered methionine. This decrease is tentatively attributed to a rapid utilization of the methyl moiety of methionine for transmethylation, accompanied by recycling of homocysteine to methionine. Transmethylation was estimated to be the dominant route for methionine metabolism.
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