Journal
FITOTERAPIA
Volume 136, Issue -, Pages -Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fitote.2019.104183
Keywords
Oryza sativa L.; Diterpenoids; Momilactones; Allelopathy; Phytoalexin
Categories
Funding
- National Natural Science Foundation of China [31800332, 31670414, 31770474]
- Young and Middle-aged Teachers Education Scientific Research Project of Fujian Provincial Department of Education [JAT170203]
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Diterpenoids are the main secondary metabolites of plants and with a range of biological activities. In the present study, 7 compounds were isolated from the hulls of rice (Oryza sativa L.). Among them, 3 diterpenoids are new namely, 3,20-epoxy-3 alpha-hydroxy- 8,11,13-abietatrie-7-one (1), 4,6-epoxy-3 beta-hydroxy-9 beta-pimara-7,15-diene (2) and 2-((E)-3- (4-hydroxy-3-methoxyphenyl) allylidene) momilactone A (3). While, 4 terpenoids are known, namely momilactone A (4), momilactone B (5), ent-7-oxo-kaur-15-en-18-oic acid (6) and orizaterpenold (7). The structures of these diterpenoids were elucidated using 1D and 2D NMR in combination with ESI-MS and HR-EI-MS. Furthermore, all isolated compounds displayed antifungal activities against four crop pathogenic fungi Magnaporthe grisea, Rhizoctonia solani, Blumeria graminearum and Fusarium oxysporum, and phytotoxicity against paddy weed Echinochloa crusgalli. The results suggested that rice could produce plenty of secondary metabolites to defense against weeds and pathogens.
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