Isolation and characterization of two phytoalexins from rice as momilactones A and B

Cartwright, David; Langcake, P.; Pryce, Robert J.; Leworthy, David P.; Ride, J.P.

doi:10.1016/s0031-9422(00)84189-8

Cited by 201 publications

(170 citation statements)

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“…M B differs from M A by a bridge in the ring A, attached with a hydroxyl group that may result in different strength of M A and M B in herbicidal, antibacterial, antifungal and antioxidant activities. All plant parts of rice such as leaves, hulls, straws, and rhizomes are known to possess M A and M B (Cartwright et al 1977, 1981, Kodama et al 1988, Lee et al 1999, Kato-Noguchi & Ino 2003a. Quantity of the M A and M B in rice increased to their maximal levels at the heading stage (120 days after seedling were about 4.6 and 3.1 mg/g dry weight, respectively), and then gradually decreased (180 days after seedling were 1.86 and 0.99 mg/g dry weight, respectively [Lee et al 1999]).…”

Section: Discussionmentioning

confidence: 99%

“…Previous research announced that M A and M B are triggered by pathogen infection, including fungi and virus (Cartwright et al 1977, Agrawal et al 2002, Jung et al 2005. M A which is induced in rice leaves as a phytoalexin occurs constitutively in rice seeds (Cartwright et al 1981). Production of momilactones was enhanced when rice plants were pretreated with compound WL 28325 (2,2-dichloro-3,3-dimethylcyclopropane carboxylic acid) prior to infection with blast disease, and M B was scarcely observed in WL28325 untreated rice blast leaves (Cartwright & Langcake 1980).…”

Section: Discussionmentioning

confidence: 99%

“…The diterpenoids (M A and M B ) were first isolated by Japanese scientists from rice husks (Kato et al 1973) and indicated by them as potential plant growth inhibitors. Since then, much work on momilactones conducted by many worldwide scientists has found that most parts of the rice plant contain M A and M B , including leaves, hulls, straws and root exudates (Cartwright et al 1977, 1981, Kodama et al 1988, Lee et al 1999, Kato-Noguchi & Ino 2003a. Both M A and M B are considered as phytoalexins of rice, and M A is regarded as a rice defense system against pathogens (Nojiri et al 1996, Tamogami & Kodama 2000, Agrawal et al 2002.…”

Section: Introductionmentioning

confidence: 99%

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Comparative efficaciesin vitroof antibacterial, fungicidal, antioxidant, and herbicidal activities of momilatones A and B

Fukuta¹,

Xuan²,

Deba³

et al. 2007

Journal of Plant Interactions

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Momilactones A (M A ) and B (M B ) are phytoalexins derived from rice plant (Oryza sativa) and were considered to be a part of the mechanism of rice self-defense system. The present study was to evaluate the comparative efficacies in vitro of antibacterial, fungicidal, antioxidant, and herbicidal activities of M A and M B . In general, M B shows higher antifungal, antibacterial, and herbicidal action than M A , although its antioxidant property was less than M A . In herbicidal trial, the IC 50 values of M B against germination, shoot and root elongation of barnyardgrass and monochoria were 40.9, 45.5, and 27.5, and 27.1, 17.3, and 0.9 mg, respectively. For M A , these values were 40.3, 35.6, and 55.1, and 43.9, 24.3, and 0.5 mg, respectively. For antifungal activity, momilactone B (IC 50 : 1.2, 123.9, and 53.4 mg) exerted significantly greater inhibition than M A (IC 50 : 78.1, 198.1, and 95.3 mg) against Botrytis cinerea, Fusarium solani, Colletrotrichum gloeosporioides, respectively, except for Fusarium oxysporum that both M A and M B showed no marked difference. In addition, M B exhibited significantly stronger antibacterial activity than M A against Pseudomonus ovalis, Bacillus cereus, and Bacillus pumilus, whereas the inhibitory activity of the two compounds was similar against Escherichia coli. Both M A and M B exerted rather weak antioxidant activity (EC 50 was 783.9 and 790.7 mg, respectively), of which M A showed a slightly stronger antioxidant activity than M B . This study is the first to examine antifungal, antibacterial, and antioxidant activities of two phytoalexins, as well as their comparative efficacies against growth of the noxious weeds barnyardgrass and monochoria.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative efficaciesin vitroof antibacterial, fungicidal, antioxidant, and herbicidal activities of momilatones A and B

Fukuta¹,

Xuan²,

Deba³

et al. 2007

Journal of Plant Interactions

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“…1) against the fungal rice blast disease pathogen Magnaporthe oryzae in rice leaves and straw (Cartwright et al 1977(Cartwright et al , 1981. The function of momilactone A as a phytoalenxin was extensively studied against fungal pathogens (Fukuta et al 2007;Okada et al 2007;Hasegawa et al 2010), whereas momilactone B was much less described (Fukuta et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Allelopathic momilactones A and B are implied in rice drought and salinity tolerance, not weed resistance

Xuan

Minh

Anh

et al. 2016

Agron. Sustain. Dev.

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Momilactones A and B are allopathic phytoalexins that are involved in weed resistance of rice. There is little knowledge on the roles of momilactones A and B on drought and salinity tolerance. Here we analyzed the contents of momilactones A and B in 30 rice cultivars of various origins including hybrid, foreign, sticky, local, upland sticky, and upland rice of the two subtypes Indica and Japonica. Momilactone contents were compared with salinity tolerance, drought tolerance, weed resistance, total flavonoids, total phenols, and antioxidant capacity. Results show that, contrary to the current knowledge, momilactones A and B have very low correlation with weed resistance, with r coefficients of 0.001 and 0.09, respectively. Correlation was higher with drought tolerance, of 0.65 for momilactones A and 0.27 for momilactones B. Overall we conclude that the development of bioactive reagents derived from momilactones A and B is more potent to reduce salinity and drought stresses than weed tolerance in rice.

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“…Four structurally distinct types of polycyclic diterpenoid phytoalexins, oryzalexins A-F [3][4][5], ())-phytocassanes A-E [6][7][8], momilactones A and B [9,10], and oryzalexin S [11], have been identified in extracts of the leaves of rice plants that were either infected with the rice leaf blast pathogen, Magnaporthe grisea, or exposed to ultra-violet (UV)-irradiation. The proposed pathways for biosynthesis of diterpenoid phytoalexins in rice are illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Stemar‐13‐ene synthase, a diterpene cyclase involved in the biosynthesis of the phytoalexin oryzalexin S in rice

et al. 2004

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In suspension-cultured rice cells, diterpenoid phytoalexins are produced in response to exogenously applied elicitors. We isolated a cDNA encoding a diterpene cyclase, OsDTC2, from suspension-cultured rice cells treated with a chitin elicitor. The OsDTC2 cDNA was overexpressed in Escherichia coli as a fusion protein with glutathione S-transferase, and the recombinant OsDTC2 was indicated to function as stemar-13-ene synthase that converted syn-copalyl diphosphate to stemar-13-ene, a putative diterpene hydrocarbon precursor of the phytoalexin oryzalexin S. The level of OsDTC2 mRNA in suspension-cultured rice cells began to increase 3 h after addition of the elicitor and reached the maximum after 8 h. The expression of OsDTC2 was also induced in UV-irradiated rice leaves. In addition, we indicated that stemar-13-ene accumulated in the chitin-elicited suspension-cultured rice cells and the UVirradiated rice leaves.

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Isolation and characterization of two phytoalexins from rice as momilactones A and B

Cited by 201 publications

References 7 publications

Comparative efficaciesin vitroof antibacterial, fungicidal, antioxidant, and herbicidal activities of momilatones A and B

Comparative efficaciesin vitroof antibacterial, fungicidal, antioxidant, and herbicidal activities of momilatones A and B

Allelopathic momilactones A and B are implied in rice drought and salinity tolerance, not weed resistance

Stemar‐13‐ene synthase, a diterpene cyclase involved in the biosynthesis of the phytoalexin oryzalexin S in rice

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