Stimulation of Mycelia Growth in Several Mushroom Species by Rice Husks

Hanai, Hidetoshi; Ishida, Sayuri; Saito, Chiaki; Maita, Tetsuya; Kusano, Miyako; Tamogami, Shigeru; Noma, Masana

doi:10.1271/bbb.69.123

Cited by 8 publications

(4 citation statements)

References 11 publications

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“…The HCD collision energy was set to 30%, where the ±HCD collision energy was set to 10% (Yan et al, 2021 ). Because we could not obtain authentic phytoalexin standards, we identified phytoalexins by characteristic ions in the MS spectra reported in previous studies (Hanai et al, 2005 ; Shimizu et al, 2008 ; Wang et al, 2018 ). Specifically, ions at 315.1955 represent momilactone A, ions at 331.1904 represent momilactone B, ions at 301.2162 represent oryzalexin C, ions at 317.2111 represent phytocassane A, ions at 335.2217 represent phytocassane B, and ions at 319.2268 represent phytocassane C (Figure S17 ).…”

Section: Methodsmentioning

confidence: 99%

“…The HCD collision energy was set to 30%, where the ±HCD collision energy was set to 10% (Yan et al, 2021). Because we could not obtain authentic phytoalexin standards, we identified phytoalexins by characteristic ions in the MS spectra reported in previous studies (Hanai et al, 2005;Shimizu et al, 2008;Wang et al, 2018). Specifically, ions at were jointly used for LC-MS data analysis, including qualitative and quantitative analysis.…”

Section: Determination Of Ja and Phytoalexin Contents Using Liquid Ch...mentioning

confidence: 99%

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OsGLP3‐7 positively regulates rice immune response by activating hydrogen peroxide, jasmonic acid, and phytoalexin metabolic pathways

Sun

et al. 2023

Molecular Plant Pathology

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Although germin‐like proteins (GLPs) have been demonstrated to participate in plant biotic stress responses, their specific functions in rice disease resistance are still largely unknown. Here, we report the identification and characterization of OsGLP3‐7 , a member of the GLP family in rice. Expression of OsGLP3‐7 was significantly induced by pathogen infection, jasmonic acid (JA) treatment, and hydrogen peroxide (H 2 O 2 ) treatment. OsGLP3‐7 was highly expressed in leaves and sublocalized in the cytoplasm. Overexpression of OsGLP3‐7 increased plant resistance to leaf blast, panicle blast, and bacterial blight, whereas disease resistance in OsGLP3‐7 RNAi silenced plants was remarkably compromised, suggesting this gene is a positive regulator of disease resistance in rice. Further analysis showed that OsGLP3‐7 has superoxide dismutase (SOD) activity and can influence the accumulation of H 2 O 2 in transgenic plants. Many genes involved in JA and phytoalexin biosynthesis were strongly induced, accompanied with elevated levels of JA and phytoalexins in OsGLP3‐7 ‐overexpressing plants, while expression of these genes was significantly suppressed and the levels of JA and phytoalexins were reduced in OsGLP3‐7 RNAi plants compared with control plants, both before and after pathogen inoculation. Moreover, we showed that OsGLP3‐7 ‐dependent phytoalexin accumulation may, at least partially, be attributed to the elevated JA levels observed after pathogen infection. Taken together, our results indicate that OsGLP3‐7 positively regulates rice disease resistance by activating JA and phytoalexin metabolic pathways, thus providing novel insights into the disease resistance mechanisms conferred by GLPs in rice.

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Section: Methodsmentioning

confidence: 99%

“…The HCD collision energy was set to 30%, where the ±HCD collision energy was set to 10% (Yan et al, 2021). Because we could not obtain authentic phytoalexin standards, we identified phytoalexins by characteristic ions in the MS spectra reported in previous studies (Hanai et al, 2005;Shimizu et al, 2008;Wang et al, 2018). Specifically, ions at were jointly used for LC-MS data analysis, including qualitative and quantitative analysis.…”

Section: Determination Of Ja and Phytoalexin Contents Using Liquid Ch...mentioning

confidence: 99%

OsGLP3‐7 positively regulates rice immune response by activating hydrogen peroxide, jasmonic acid, and phytoalexin metabolic pathways

Sun

et al. 2023

Molecular Plant Pathology

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“…Specifically, MB effectively suppresses and reduces the growth of three bacteria: Pseudomonas ovalis (17.2 mm), Bacillus cereus (15.5 mm), and Bacillus pumilus (14.2 mm) [65]. In addition to its antibacterial properties, MA also displayed inhibitory effects on the mycelia growth of cyanobacteria Microcystis aeruginosa (M. aeruginosa) [81], and the mushroom species Coprinus cinereus (5 µg/disc) [82]. The above-mentioned bacteria are involved in various diseases in humans.…”

Section: Antibacterial Activitymentioning

confidence: 99%

Potential Momilactones in Rice Stress Tolerance and Health Advantages

Rayee,

Anh,

Khanh

et al. 2024

Agronomy

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The aim of this review was to provide an updated outlook on the relevance of momilactones in rice during the 50 years since their discovery. Momilactones A (MA) and B (MB) were initially extracted from rice husks in 1973 and have since been identified in various parts of the rice plant including leaves, bran, straw, roots, and root exudates. The biosynthesis of these compounds in rice initiates from geranylgeranyl diphosphate (GGDP) and progresses through several cyclization stages. The genes governing the synthesis of MA and MB are located on chromosome 4 within the rice genome. Concentrations of these compounds vary across different parts of the rice plant, ranging from 2 to 157 μg/g. Notably, Japonica rice varieties tend to have higher levels of MA and MB (157 and 83 μg/g, respectively) compared to Indica varieties (20.7 and 4.9 μg/g, respectively). There is a direct correlation between the levels of MA and MB and the increase in antioxidant activity, protein, and amylose content in rice grains. The production of these compounds is enhanced under environmental stresses such as drought, salinity, chilling, and UV exposure, indicating their potential role in rice’s tolerance to these conditions. MA and MB also demonstrate allelopathic, antibacterial, and antifungal properties, potentially improving the resilience of rice plants against biotic stressors. Although their antioxidant activity is modest, they effectively inhibit leukemia cells at a concentration of 5 µM. They also show promise in diabetes management by inhibiting enzymes like α-amylase (with IC50 values of 132.56 and 129.02 mg/mL, respectively) and α-glucosidase (with IC50 values of 991.95 and 612.03 mg/mL, respectively). The therapeutic qualities of MA and MB suggest that cultivating rice varieties with higher concentrations of these compounds, along with developing their derivatives, could benefit the pharmaceutical industry and enhance treatments for chronic diseases. Consequently, breeding rice cultivars with increased momilactone levels could offer substantial advantages to rice farmers.

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“…Momilactone A inhibited the mycelia growth of the mushroom Coprinus cinereus [45] and the cyanobacteria Microcystis aeruginosa [46]. Momilactones A and B inhibited the growth of the bacteria Escherichia coli, Pseudomonas putida (former name, Pseudomonas ovalis), Bacillus cereus and Bacillus pumilus [39].…”

Section: Anti-microbe Activitymentioning

confidence: 99%

Defensive Molecules Momilactones A and B: Function, Biosynthesis, Induction and Occurrence

Kato‐Noguchi

2023

Toxins

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Labdane-related diterpenoids, momilactones A and B were isolated and identified in rice husks in 1973 and later found in rice leaves, straws, roots, root exudate, other several Poaceae species and the moss species Calohypnum plumiforme. The functions of momilactones in rice are well documented. Momilactones in rice plants suppressed the growth of fungal pathogens, indicating the defense function against pathogen attacks. Rice plants also inhibited the growth of adjacent competitive plants through the root secretion of momilactones into their rhizosphere due to the potent growth-inhibitory activity of momilactones, indicating a function in allelopathy. Momilactone-deficient mutants of rice lost their tolerance to pathogens and allelopathic activity, which verifies the involvement of momilactones in both functions. Momilactones also showed pharmacological functions such as anti-leukemia and anti-diabetic activities. Momilactones are synthesized from geranylgeranyl diphosphate through cyclization steps, and the biosynthetic gene cluster is located on chromosome 4 of the rice genome. Pathogen attacks, biotic elicitors such as chitosan and cantharidin, and abiotic elicitors such as UV irradiation and CuCl2 elevated momilactone production through jasmonic acid-dependent and independent signaling pathways. Rice allelopathy was also elevated by jasmonic acid, UV irradiation and nutrient deficiency due to nutrient competition with neighboring plants with the increased production and secretion of momilactones. Rice allelopathic activity and the secretion of momilactones into the rice rhizosphere were also induced by either nearby Echinochloa crus-galli plants or their root exudates. Certain compounds from Echinochloa crus-galli may stimulate the production and secretion of momilactones. This article focuses on the functions, biosynthesis and induction of momilactones and their occurrence in plant species.

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Stimulation of Mycelia Growth in Several Mushroom Species by Rice Husks

Cited by 8 publications

References 11 publications

OsGLP3‐7 positively regulates rice immune response by activating hydrogen peroxide, jasmonic acid, and phytoalexin metabolic pathways

OsGLP3‐7 positively regulates rice immune response by activating hydrogen peroxide, jasmonic acid, and phytoalexin metabolic pathways

Potential Momilactones in Rice Stress Tolerance and Health Advantages

Defensive Molecules Momilactones A and B: Function, Biosynthesis, Induction and Occurrence

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