Diterpene Phytoalexins Are Biosynthesized in and Exuded from the Roots of Rice Seedlings

Toyomasu, Tomonobu; Kagahara, Takuma; Okada, Kazunori; Koga, Jinichiro; Hasegawa, Morifumi; Mitsuhashi, Wataru; Sassa, Takeshi; Yamane, Hisakazu

doi:10.1271/bbb.70677

Cited by 78 publications

(62 citation statements)

References 22 publications

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“…Notably, ZmAN2 is located proximal to a quantitative trait locus mapped to bin 1.03 that is associated with root growth (Rahman et al, 2011), and ZmKSL4 colocates in bin 1.08 with quantitative trait loci associated with both drought tolerance (Tuberosa et al, 2002) and abscisic acid biosynthesis, which can further mediate drought-induced phytoalexin biosynthesis in maize roots (Vaughan et al, 2015). Our findings here contribute to a growing body of knowledge demonstrating roles for root diterpenoids, including momilactone phytoalexins in rice (Toyomasu et al, 2008), the antiherbivory activity of rhizathalene in Arabidopsis (Arabidopsis thaliana; Vaughan et al, 2013), and drought tolerance mediated by isorosmanol in rosemary (Rosmarinus officinalis; Munné-Bosch and Alegre, 2000).…”

Section: Discussionmentioning

confidence: 55%

Discovery, Biosynthesis and Stress-Related Accumulation of Dolabradiene-Derived Defenses in Maize

et al. 2018

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Section: Discussionmentioning

confidence: 55%

Discovery, Biosynthesis and Stress-Related Accumulation of Dolabradiene-Derived Defenses in Maize

et al. 2018

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“…5) We found that phytocassanes A to E and momilactones A and B are released from roots. 37) In contrast to momilactone B, phytocassanes do not show inhibitory activity against dicot seedling growth. 37) The rice blast fungus Magnaporthe grisea, which is believed to attack the aerial parts of rice, causes a devastating disease in infected rice plants, but a previous study found that M. grisea also invades rice roots by a typical root-specific pathway.…”

Section: Labdane-related Diterpene Cyclase Gene Family In Ricementioning

confidence: 97%

Recent Advances Regarding Diterpene Cyclase Genes in Higher Plants and Fungi

Toyomasu

2008

Bioscience, Biotechnology, and Biochemistry

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100

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Cyclic diterpenoids are commonly biosynthesized from geranylgeranyl diphosphate (GGDP) through the formation of carbon skeletons by specific cyclases and subsequent chemical modifications, such as oxidation, reduction, methylation, and glucosidation. A variety of diterpenoids are produced in higher plants and fungi. Rice produces four classes of diterpene phytoalexins, phytocassanes A to E, oryzalexins A to F, oryzalexin S, and momilactones A and B. The six diterpene cyclase genes involved in the biosynthesis of these phytoalexins were identified and characterized. Fusicoccin A was produced by the phytopathogenic Phomopsis amygdali and served as a plant H þ -ATPase activator. A PaFS, encoding a fungal diterpene synthase responsible for fusicoccin biosynthesis, was isolated. The PaFS is an unusual chimeric diterpene synthase that possesses not only terpene cyclase activity (the formation of fusicoccadiene, a biosynthetic precursor of fusicoccin A), but also prenyltransferase activity (the formation of GGDP). Thus, we identified a unique multifunctional diterpene synthase family in fungi.

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“…Momilactones A and B have been demonstrated as plant growth inhibitors, but the inhibitory of momilactone B was stronger than momilactone A (Kato-Noguchi et al 2008a;Kato et al 1977;Fukuta et al 2007;Toyomasu et al 2008). In quantity, the endogenous concentrations of momilactone A was greater than momilactone B (Lee et al 1999;Chung et al 2006;Kato-Noguchi et al 2008a), but the secretion rates of momilactone A > momilactone B (Kato-Noguchi et al 2008a).…”

Section: Correlation Coefficientsmentioning

confidence: 99%

“…Among potential growth inhibitors detected in rice including phenolic acids, fatty acids, phenylalkanoic acids, hydroxyamic acids, terpenes, and indoles, momilactones A and B particularly play a critical role (Kato-Noguchi and Peters 2013). Extensive trials in fields (Chung et al 2006) and laboratories have been conducted to verify the roles of momilactones A and B toward weed resistance (Kato-Noguchi et al 2008a, b;Chung et al 2006, Fukuta et al 2007Toyomasu et al 2008).…”

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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Diterpene Phytoalexins Are Biosynthesized in and Exuded from the Roots of Rice Seedlings

Cited by 78 publications

References 22 publications

Discovery, Biosynthesis and Stress-Related Accumulation of Dolabradiene-Derived Defenses in Maize

Discovery, Biosynthesis and Stress-Related Accumulation of Dolabradiene-Derived Defenses in Maize

Recent Advances Regarding Diterpene Cyclase Genes in Higher Plants and Fungi

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

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