sakuranetin/oryza

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Naringenin 7-O-methyltransferase involved in the biosynthesis of the flavanone phytoalexin sakuranetin from rice (Oryza sativa L.).

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An inducible S-adenosyl-L-methionine:naringenin 7-O-methyltransferase (NOMT) catalyzing the methylation of naringenin to sakuranetin, a major rice phytoalexin was purified approximately 985-fold from ultraviolet (UV)-irradiated rice leaves. The enzyme is not found in healthy tissues and was purified

A methyltransferase for synthesis of the flavanone phytoalexin sakuranetin in rice leaves.

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Rice (Oryza sativa L.) leaves irradiated with short wave UV light accumulated the major rice phytoalexin, flavanone sakuranetin. The extracts from these leaves catalyzed the methylation of the hydroxyl group at position 7 of naringenin to yield sakuranetin, with S-adenosyl-L-methionine as the methyl

Phytoalexin production by amino acid conjugates of jasmonic acid through induction of naringenin-7-O-methyltransferase, a key enzyme on phytoalexin biosynthesis in rice (Oryza sativa L.).

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Amino acid conjugates of jasmonic acid are found to elicit production of the flavonoid phytoalexin, sakuranetin in rice leaves. The elicitation is shown to arise from induction of naringenin 7-O-methyltransferase, a key enzyme of sakuranetin biosynthesis. The (-)-phenylalanine conjugate, one of the

Transcriptome Analysis of Early Responsive Genes in Rice during Magnaporthe oryzae Infection.

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Rice blast disease caused by Magnaporthe oryzae is one of the most serious diseases of cultivated rice (Oryza sativa L.) in most rice-growing regions of the world. In order to investigate early response genes in rice, we utilized the transcriptome analysis approach using a 300 K tilling microarray

Coronatine elicits phytoalexin production in rice leaves (Oryza sativa L.) in the same manner as jasmonic acid.

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The phytotoxin coronatine induced the accumulation of the flavonoid phytoalexins sakuranetin and momilactone A in rice leaves. Coronatine-inducible sakuranetin production was under the control of kinetin and ascorbic acid (AsA), as observed with jasmonic acid (JA). The effects of kinetin and AsA on

Differential expression of defense/stress-related marker proteins in leaves of a unique rice blast lesion mimic mutant (blm).

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We analyzed a unique rice (Oryza sativa L.) blast lesion mimic (blm) mutant for differentially expressed proteins in leaves of one- and two-week-old seedlings manifesting the lesion mimic phenotype. Gel-based one- and two-dimensional electrophoresis (1- and 2-DGE) was performed using leaves (blm and

The rice (Oryza sativa) blast lesion mimic mutant, blm, may confer resistance to blast pathogens by triggering multiple defense-associated signaling pathways.

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Here we characterized a rice (Oryza sativa L.) blast lesion mimic (blm) mutant, identified previously in an N-methyl-N-nitrosourea-mutagenized population of the cultivar Hwacheong (wild type). The rice blm displayed spontaneous necrotic lesion formation on the leaves during development under

Natural variation in the expression and catalytic activity of a naringenin 7-O-methyltransferase influences antifungal defenses in diverse rice cultivars.

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Phytoalexins play a pivotal role in plant-pathogen interactions. Whereas leaves of rice (Oryza sativa) cultivar Nipponbare predominantly accumulated the phytoalexin sakuranetin after jasmonic acid induction, only very low amounts accumulated in the Kasalath cultivar. Sakuranetin is synthesized from

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