Variation of diterpenoid phytoalexin oryzalexin A production in cultivated and wild rice

Kariya, Keisuke; Murata, Koichi; Kokubo, Yu; Ube, Naoki; Ueno, Kotomi; Yabuta, Yukinori; Teraishi, Masayoshi; Okumoto, Yutaka; Mori, Naoki; Ishihara, Atsushi

doi:10.1016/j.phytochem.2019.112057

Cited by 14 publications

(11 citation statements)

References 41 publications

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“…The in vitro inhibitory activity of oryzalexin A on M. grisea conidial germination, with an ED 50 value of 130 ppm (0.43 mM), was reported by Akatsuka and collaborators [ 33 ]. Kariya et al [ 53 ] recently studied the accumulation of oryzalexin A in response to UV light in 69 cultivars from the World Rice Core Collection (WRC) [ 49 ] and in 10 strains of the wild species Oryza rufipogon (the putative wild ancestor of cultivated rice). They found that only ten of the studied cultivars, belonging to both the japonica and indica subspecies, produced oryzalexin A.…”

Section: Diversity and Distribution Of Rice Phytoalexinsmentioning

confidence: 99%

“…They also reported that, in some cultivars, oryzalexin A accumulation is induced by UV light but not by jasmonic acid (JA), while in others, it is induced by JA but not UV light. This indicates that different signal transduction pathways are induced by UV and JA, and in these cultivars, one of these pathways does not operate [ 53 ].…”

Section: Diversity and Distribution Of Rice Phytoalexinsmentioning

confidence: 99%

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Rice Phytoalexins: Half a Century of Amazing Discoveries; Part I: Distribution, Biosynthesis, Chemical Synthesis, and Biological Activities

Valletta

Iozia

Fattorini

et al. 2023

Plants

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Cultivated rice is a staple food for more than half of the world’s population, providing approximately 20% of the world’s food energy needs. A broad spectrum of pathogenic microorganisms causes rice diseases leading to huge yield losses worldwide. Wild and cultivated rice species are known to possess a wide variety of antimicrobial secondary metabolites, known as phytoalexins, which are part of their active defense mechanisms. These compounds are biosynthesized transiently by rice in response to pathogens and certain abiotic stresses. Rice phytoalexins have been intensively studied for over half a century, both for their biological role and their potential application in agronomic and pharmaceutical fields. In recent decades, the growing interest of the research community, combined with advances in chemical, biological, and biomolecular investigation methods, has led to a notable acceleration in the growth of knowledge on rice phytoalexins. This review provides an overview of the knowledge gained in recent decades on the diversity, distribution, biosynthesis, chemical synthesis, and bioactivity of rice phytoalexins, with particular attention to the most recent advances in this research field.

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Section: Diversity and Distribution Of Rice Phytoalexinsmentioning

confidence: 99%

Section: Diversity and Distribution Of Rice Phytoalexinsmentioning

confidence: 99%

Rice Phytoalexins: Half a Century of Amazing Discoveries; Part I: Distribution, Biosynthesis, Chemical Synthesis, and Biological Activities

Valletta

Iozia

Fattorini

et al. 2023

Plants

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show abstract

“…In addition to flavonoid phytoalexins (sakuranetin and naringenin), the natural variation in diterpenoid phytoalexins, including oryzalexin A, 64) momilactones, and phytocassanes were investigated. 65) The treatment with jasmonic acid did not induce the accumulation of diterpenoid phytoalexins 66) ; therefore, the leaves of rice seedlings were irradiated with ultraviolet (UV) light.…”

Section: Natural Variation Of Diterpenoid Phytoalexins In Ricementioning

confidence: 99%

Defense mechanisms involving secondary metabolism in the grass family

Ishihara

2021

J. Pestic. Sci.

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Plants synthesize and accumulate a wide variety of compounds called secondary metabolites. Secondary metabolites serve as chemical barriers to protect plants from pathogens and herbivores. Antimicrobial secondary metabolites are accumulated to prevent pathogen infection. These metabolites are classified into phytoalexins (induced in response to pathogen attack) and phytoanticipins (present prior to pathogen infection). The antimicrobial compounds in the grass family (Poaceae) were studied from the viewpoint of evolution. The studies were performed at three hierarchies, families, genera, and species and include the following: 1) the distribution of benzoxazinoids (Bxs) in the grass family, 2) evolutionary replacement of phytoanticipins from Bxs to hydroxycinnamic acid amide dimers in the genus Hordeum, and 3) chemodiversity of flavonoid and diterpenoid phytoalexins in rice. These studies demonstrated dynamic changes in secondary metabolism during evolution, indicating the adaptation of plants to their environment by repeating scrap-and-build cycles.

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“…The World Rice Core Collection (WRC) (Kojima et al 2005 ) and the Rice Core Collection of Japanese Landraces (JRC) (Ebana et al 2008 ), which are provided by the National Agriculture and Food Research Organization (NARO, Japan), cover a wide range of genetic diversity of landraces in rice, and they are useful material for the isolation of related quantitative trait loci by GWAS (genome-wide association studies) and for the elucidation of loci associated with phenotypic diversity (Tanaka et al 2020 , 2021 ). Analysis using the WRC revealed that the amount and type of phytoalexins induced in stress-treated leaves differ between accessions, and novel antimicrobial secondary metabolites have been found in the leaves of several accessions (Kariya et al 2019 , 2020 ; Murata et al 2020 ). In addition, Friedman ( 2013 ) reported that different rice secondary metabolites are produced in specific organs and tissues.…”

Section: Introductionmentioning

confidence: 99%

Measurements of Antibacterial Activity of Seed Crude Extracts in Cultivated Rice and Wild Oryza Species

Yoshida

Nosaka-T

Yoshikawa

et al. 2022

Rice

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Seeds are continuously exposed to a wide variety of microorganisms in the soil. In addition, seeds contain large amounts of carbon and nitrogen sources that support initial growth after germination. Thus, seeds in the soil can easily promote microbial growth, and seeds are susceptible to decay. Therefore, seed defense against microorganisms is important for plant survival. Seed-microbe interactions are also important issues from the perspective of food production, in seed quality and shelf life. However, seed-microbe interactions remain largely unexplored. In this study, we established a simple and rapid assay system for the antibacterial activity of rice seed crude extracts by colorimetric quantification methods by the reduction of tetrazolium compound. Using this experimental system, the diversity of effects of rice seed extracts on microbial growth was analyzed using Escherichia coli as a bacterial model. We used collections of cultivated rice, comprising 50 accessions of Japanese landraces, 52 accessions of world rice core collections, and of 30 wild Oryza accessions. Furthermore, we attempted to find genetic factors responsible for the diversity by genome-wide association analysis. Our results demonstrate that this experimental system can easily analyze the effects of seed extracts on bacterial growth. It also suggests that there are various compounds in rice seeds that affect microbial growth. Overall, this experimental system can be used to clarify the chemical entities and genetic control of seed-microbe interactions and will open the door for understanding the diverse seed-microbe interactions through metabolites.

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Variation of diterpenoid phytoalexin oryzalexin A production in cultivated and wild rice

Cited by 14 publications

References 41 publications

Rice Phytoalexins: Half a Century of Amazing Discoveries; Part I: Distribution, Biosynthesis, Chemical Synthesis, and Biological Activities

Rice Phytoalexins: Half a Century of Amazing Discoveries; Part I: Distribution, Biosynthesis, Chemical Synthesis, and Biological Activities

Defense mechanisms involving secondary metabolism in the grass family

Measurements of Antibacterial Activity of Seed Crude Extracts in Cultivated Rice and Wild Oryza Species

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