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During senescence of detached rice leaves, tryptophan (Trp) and Trp‐derived secondary metabolites such as serotonin and 4‐coumaroylserotonin accumulated in concert with methanol (MeOH) production. This senescence‐induced MeOH induction was closely associated with levels of pectin methylesterase (PME)1 mRNA and PME enzyme activity. Exogenous challenge of detached rice leaves with 1% MeOH accelerated...
Abstract: N‐acetylserotonin methyltransferase (ASMT), the last enzyme in the synthesis of melatonin, catalyzes N‐acetylserotonin into melatonin. For the first time, we cloned ASMT from rice through the analysis of recombinant Escherichia coli harboring putative rice O‐methyltransferase (OMT) cDNAs. In total, 18 full‐length cDNAs, which show homology to wheat caffeic acid 3‐O‐methyltransferase, were...
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