Promotive effect of soil solution on germination of <i>Monochoria vaginalis</i> under paddy conditions

Nozoe, Takuhito; Tazawa, Junko; Uchino, Akira; Miura, Shigenori

doi:10.1080/00380768.2018.1433957

Cited by 8 publications

(10 citation statements)

References 26 publications

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“…These findings indicated that a weak acid condition was more conducive for M. vaginalis germination than a neutral condition. This supports the finding of Nozoe et al (2018), who reported that germination increased in low-pH soil solutions, as long as the pH ranged from 4.0 to 7.0.…”

Section: Experiments 1: Effects Of Ph In Suppression Assaysupporting

confidence: 92%

“…However, a low pH value is not always beneficial for rice cultivation. First, low pH stimulates M. vaginalis germination based on the findings of this study (Figure 1a) and the report of Nozoe et al (2018). Subsequently, the optimum pH for rice growth is reported to be approximately between 5 and 6 (Alam, 1981;Fageria & Baligar, 1999), indicating that a pH value that is lower than 5 can retard rice growth.…”

Section: Experiments 1: Effects Of Ph In Suppression Assaysupporting

confidence: 67%

“…Stock solutions were prepared at concentrations of 1 M and 10 mM for VFAs and ACAs, respectively, with sterilized distilled water. We used a citrate-phosphate (McIlvaine's) pH buffer prepared on the basis of Stoll and Blanchard (1990), with slight modifications by Nozoe et al (2018) for assay solution to perform the assay under constant condition, because the pH of a solution varies depending on solute composition. Buffers of pH 4.6, 5.2, 5.8, 6.4, and 7.0 were prepared in combination with 20 mM of disodium hydrogen phosphate and 10 mM of citric acid.…”

Section: Seeds and Chemicalsmentioning

confidence: 99%

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Suppressive activity of volatile fatty acids and aromatic carboxylic acids on the germination of Monochoria vaginalis

Tazawa

Aoki²,

Hayakawa

et al. 2021

Plant Production Science

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Rice bran application is practically used by Japanese organic rice farmers as a common measure in controlling Monochoria vaginalis, a known weed in organic rice production. To elucidate the inhibitory mechanisms of rice bran application on M. vaginalis germination, we focused on volatile fatty acids (VFAs) and aromatic carboxylic acids (ACAs) as organic acids produced through rice bran decomposition in the soil, which can possibly suppress M. vaginalis germination. Both solo solutions of 1 mM VFAs (propionic or isobutyric acid) and 0.2 mM ACAs (3-phenylpropionic or 4-phenylbutyric acid) exhibited M. vaginalis germination suppression, especially at pH 4.6, the lowest pH tested. In the 0.5-3 mM VFA solutions at pH 4.6, germination was strongly suppressed in the order of isobutyric > propionic > butyric > acetic acid. With the 0.05-0.2 mM ACA solutions at pH 4.6, the germination was strongly suppressed in the order of 3-phenylpropionic > 4-phenylbutyric > 2-phenylpropionic acid. Benzoic acid did not exhibit significant germination suppression. The solutions of 0.5 mM VFAs and 0.05 mM ACAs exhibited no suppression when applied separately; however, the certain mixture of a VFA and an ACA at the aforementioned concentration, for example, 0.5 mM isobutyric acid and 0.05 mM 3-phenylpropionic acid, exhibited significant germination suppression. These results showed the several combinations of VFAs and ACAs at even non-effective concentrations synergistically suppressed M. vaginalis germination.

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Section: Experiments 1: Effects Of Ph In Suppression Assaysupporting

confidence: 92%

Section: Experiments 1: Effects Of Ph In Suppression Assaysupporting

confidence: 67%

Section: Seeds and Chemicalsmentioning

confidence: 99%

See 1 more Smart Citation

Suppressive activity of volatile fatty acids and aromatic carboxylic acids on the germination of Monochoria vaginalis

Tazawa

Aoki²,

Hayakawa

et al. 2021

Plant Production Science

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“…Despite spreading the same amount of rice bran in fields, it has been observed that the suppressive performance by rice bran differ among soils. Soil solutions obtained from flooded soil with rice bran had contradictory properties that both promoted and suppressed germination (Nozoe et al, 2018). Promotive activity is one factor that makes the efficacy of rice bran unstable.…”

Section: Introductionmentioning

confidence: 99%

“…The seeds of M. vaginalis require very little oxygen (O 2 ) for germination (Takeuchi et al, 2001). It was reported that germination increased with decreasing amounts of dissolved oxygen (DO) in soil solutions, and low DO content was attributed to O 2 removal by reducing agents in soil (Nozoe et al, 2018). Overall, all components of rice bran that was applied with transplanting do not disintegrate until the end of the cultivation period.…”

Section: Introductionmentioning

confidence: 99%

Factors destabilizing the control of Monochoria vaginalis by rice bran: its conflicting powers influence both suppression and promotion of germination in paddy soil

Nozoe

Miura

Tazawa

et al. 2020

Plant Production Science

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Organic paddy rice (Oryza sativa L.) cultivation can be negatively impacted because of the weeds growth like Monochoria vaginalis. Although the rice bran application is useful in combating weed, its performance is not consistent. In this study, laboratory experiments were conducted to elucidate the effects of rice bran on the suppression and promotion of germination of M. vaginalis. Suppression experiments involved incubating mixtures of flooded soil and rice bran. This was followed by a germination experiment in the collected soil solutions. A negative and significant correlation was observed between germination and the electric conductivity (EC) of the solution. None of the seeds germinated when the EC of the Gray Lowland soil was over 130 mS m −1 . Conversely, the seeds in the Andosols' solution germinated even when EC was over 130 mS m −1 . Thus, the solutions of the Andosols had different mechanisms of suppression than the Gray Lowland soils. To understand the promotion of germination, air-dried soil was prepared after the flooded incubation of rice bran and soil mixture, simulating a long-term application of rice bran. Germination was analyzed in a filtrate of the mixture of air-dried soil and distilled water. The addition of rice bran significantly promoted germination. There was a negative and significant correlation between germination and dissolved oxygen (DO) suggesting that hardly decomposable components like antioxidants in rice bran decreased O 2 and stimulated germination because the seeds of M. vaginalis require very little O 2 for germination.

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A non‐chemical weed control strategy, introducing duckweed into the paddy field

Wang

et al. 2022

Pest Management Science

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BACKGROUND Herbicide resistance in weeds and environmental pollution resulting from excessive application of chemical herbicides keeps increasing. Development of environment‐friendly and effective weed management strategies are required for sustainable agricultural production. In this study we investigated the effects of duckweeds (Landoltia punctata (G. Meyer) Les & D. J. Crawford and Spirodela polyrhiza (Linnaeus) Schle iden) introduction on the weed community and rice growth in paddy fields. RESULTS The study was conducted in the two rice‐growing seasons (2018 and 2019) with three treatments: rice grown without duckweed introduction (CK), with L. punctata introduction (LP), and with S. polyrhiza introduction (SP). On average, LP and SP significantly reduced total weed density by more than 90% and 97%, respectively. Early in the rice‐growing season, both duckweed species completely prevented weed growth. Further, both species significantly promoted rice plant growth in the advanced stages. SP significantly improved grain yield of rice by 23%. Light transmittance, temperature of the floodwater and soil, floodwater pH, and dissolved oxygen content significantly decreased following introduction of the duckweeds, indicating that the duckweeds introduction might inhibit weeds growth by altering environmental factors. CONCLUSION This study provides a possible environment‐friendly way to inhibit weed biomass in the paddy field by introducing duckweeds and interpreted the possible reasons of the impacts of duckweed on environmental variables. Weed control is beneficial for rice growth. Duckweed coverage might be limited in open fields and the associated practice requires additional investigation. © 2022 Society of Chemical Industry.

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Promotive effect of soil solution on germination of Monochoria vaginalis under paddy conditions

Cited by 8 publications

References 26 publications

Suppressive activity of volatile fatty acids and aromatic carboxylic acids on the germination of Monochoria vaginalis

Suppressive activity of volatile fatty acids and aromatic carboxylic acids on the germination of Monochoria vaginalis

Factors destabilizing the control of Monochoria vaginalis by rice bran: its conflicting powers influence both suppression and promotion of germination in paddy soil

A non‐chemical weed control strategy, introducing duckweed into the paddy field

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