Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 59, Issue 17, Pages 9226-9231Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf202418a
Keywords
strigolactone; Striga gesnerioides; synthetic strigolactone GR24; partial agonist; antagonist
Funding
- Japan Society for the Promotion of Science
- JST/JICA
- Grants-in-Aid for Scientific Research [23405023, 22580119, 23580149] Funding Source: KAKEN
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Strigolactones are highly potent germination stimulants for seeds of the parasitic weeds Striga and Orobanche spp. 4-Hydroxy-GR24 and 4-acetoxy-GR24 were prepared and their abilities to induce seed germination of Striga gesnerioides evaluated. Optically active (8bR,2'R)-isomers induced germination, although the racemic diastereomers were inactive. In contrast, the stereoisomer of GR24 with the same configuration induced negligible germination. Some stereoisomers of GR24 and its analogues acted as effective antagonists for induction of seed germination by cowpea root, exudates These results suggest that both an oxygenated substituent at C-4 and the configuration of the tricyclic lactone and the D-ring are essential structural requirements for induction of germination in S. gesnerioides seeds.
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