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The University of the Philippines (UP) is the country’s national university. This premier institution of higher learning was established in 1908 and is now a university system composed of eight constituent universities and one autonomous college spread throughout 17 campuses in the archipelago.

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Biosynthetic study of diterpene and flavone phytoalexins in rice plants  [1994]

Kodama, O.; Kato, H.; Akatsuka, T. (Ibaraki Univ., Ami, Ibaraki 300-03 (Japan). School of Agriculture);

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Several diterpene phytoalexins, oryzalexines A, B, C, D, E, and S, and the flavone phytoalexin, sakuranetin, from blast-infected or UV-irradiated rice leaves were isolated and identified. Among these oryzalexins, oryzalexin D (3, 7-dihydroxy-sandaracopimaradiene) and oryzalexin E (3,9-dihydroxy-sandaracopimaradiene) show the highest antifungal activity and were produced from 3-hydroxy-sandaracopimaradiene by inducible cytochrome P-450 dependent monooxygenase(s). The sakuranetin synthesizing enzyme, naringenin 7-0-methyltransferase, was induced in the irradiated rice leaves. Consequently, sakuranetin did accumulate in the rice leaves. Because of the low antifungal activity of the precursors of these phytoalexins, naringenin and 3-hydroxy-sandaracopimaradiene, the conversion of these compounds to active phytoalexins by either cytochrome P-450 dependent monooxygenase(s) or naringenin 7-0-methyltransferase is very important for the dynamic defense mechanisn of the rice plant

Bibliographic information

Language:
English
Type:
Summary
In AGRIS since:
1995
Publisher:
IRRI
All titles:
"Biosynthetic study of diterpene and flavone phytoalexins in rice plants"@eng
Other:
"Summary only"
"Rice blast disease, Zeigler, R.S.Leong, S.A.Teng, P.S. (eds.).- Los Banos, Laguna (Philippines): IRRI, 1994.- ISBN 0-85198-935-7. p. 602"
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Bibliographic information

Language:
English
Type:
Summary
In AGRIS since:
1995
Publisher:
IRRI
All titles:
"Biosynthetic study of diterpene and flavone phytoalexins in rice plants"@eng
Other:
"Summary only"
"Rice blast disease, Zeigler, R.S.Leong, S.A.Teng, P.S. (eds.).- Los Banos, Laguna (Philippines): IRRI, 1994.- ISBN 0-85198-935-7. p. 602"