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To understand how lignin synthesis is regulated after harvest, detached green asparagus stalks (Asparagus officinalis L.) were treated with 1 μl l−1 of 1-methylcyclopropene (1-MCP), 50 μg l−1 gibberellic acid (GA3), 2% (v:v) ethanol or 1 μl l−1 ethylene. The results showed that lignin concentration in asparagus stalks stored at room temperature rapidly increased. Three conventional precursors of lignin,...
During leaf senescence protein degradation is enhanced. In order to obtain information on the enzymes involved in this process, a study was initiated to identify and characterize proteases whose activity is elevated in artificially senescing parsley leaves. A 70-kDa serine protease (EC 3.4.21) was identified by an activity gel assay. This protease activity, which is low in young leaves, was found...
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