Publications by authors named "Asuka Kodama"
Enhancing salt stress tolerance is a key strategy for increasing global food production. We previously found that long-term salinity stress significantly reduced grain fertility in the salt-sensitive barley () accession, 'OUC613', but not in the salt-tolerant accession, 'OUE812', resulting in large differences in grain yield. Here, we examined the underlying causes of the difference in grain fertility between these accessions under long-term treatment with 150 or 200 mM NaCl from the seedling stage to harvest and identified quantitative trait loci (QTLs) for maintaining grain fertility.
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- The study assessed the DPPH radical-scavenging abilities of 2,3,4-trihydroxybenzoic acid and its methyl ester, finding that both were more effective in acetonitrile, with the ester being particularly effective in methanol.
- The methyl ester produced a novel benzocoumarin-type dimer when oxidized with o-chloranil in acetonitrile, verified by spectroscopic analysis.
- The improved radical-scavenging activity of the ester is likely linked to the formation of this dimer in certain solvents.
Article Synopsis
- The study investigates the reactions of protocatechuic and gallic acids, along with their methyl esters, with the DPPH radical using NMR technology.
- In acetone, methyl protocatechuate forms a Diels-Alder adduct, while methyl gallate produces a symmetrical dimer quickly through a quinone intermediate.
- Both dimers are unstable, and their structures were determined through in situ NMR analysis, with no dimer formations seen in methanol.