A Potent Phytotoxic Substance in <i>Aglaia odorata </i><scp>Lour</scp>.

Kato‐Noguchi, Hisashi; Suzuki, Masahiko; Noguchi, Kazutaka; Ohno, Osamu; Suenaga, Kiyotake; Laosinwattana, C.

doi:10.1002/cbdv.201500175

Cited by 32 publications

(20 citation statements)

References 15 publications

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“…The I 50 values of the C. alata leaf extracts indicate that the cress seedlings were most sensitive to the extracts, and the hypocotyl of radish and the root of rapeseed were the least sensitive (Table ), suggesting that inhibition also varied among the species. A similar phenomenon was also denoted by Das and Kato‐Noguchi (), Kato‐Noguchi et al () and Chai et al (). These concentrations and species‐dependent inhibitory activity of the C. alata leaf extracts indicate that this medicinal plant may contain phytotoxic compounds.…”

Section: Discussionsupporting

confidence: 79%

Isolation and identification of two phytotoxic compounds from the medicinal plant Cassia alata L.

Das

Iwasaki

Suenaga

et al. 2020

Weed Biology and Management

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Cassia alata (Caesalpiniaceae), an ornamental shrub, has many biological properties such as antifungal and antibacterial activities. Several bioactive and phytotoxic compounds have already been isolated from C. alata. Phytotoxic substances from plants have drawn attention as an alternative biological approach to control weeds. Thus, we conducted this research to explore other phytotoxic compounds in C. alata leaves. Aqueous methanol extracts of C. alata leaves strongly inhibited the seedling growth of broccoli, cabbage, cress, radish and rapeseed, in which the level of inhibition correlated with concentration. Two active compounds were isolated through chromatographies and identified using spectral data as (S)‐4‐(3‐hydroxybutyl)phenol [(+)‐rhododendrol] and (E)‐4‐((1R,4R)‐4‐hydroxy‐2,6,6‐trimethylcyclohex‐2‐en‐1‐yl)but‐3‐en‐2‐one [3‐hydroxy‐α‐ionone]. These two active compounds inhibited the growth of cress seedlings in a concentration‐dependent manner. The required concentrations for 50% growth inhibition (I50 value) of cress seedlings were 192.0–296.1 μM for (+)‐rhododendrol and 132.4–195.3 μM for 3‐hydroxy‐α‐ionone. These results indicate that the two phytotoxic compounds play a part in the phytotoxic activity of C. alata leaves.

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Section: Discussionsupporting

confidence: 79%

Isolation and identification of two phytotoxic compounds from the medicinal plant Cassia alata L.

Das

Iwasaki

Suenaga

et al. 2020

Weed Biology and Management

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“…A growth bioassay was conducted with the obtained aqueous and ethyl acetate fractions against cress as described above. The ethyl acetate fraction showed stronger activity; therefore, a bioassay guided purification procedure [60] was followed for purification of active substances. First, the dried crude mass was separated by chromatography using a silica gel column (60 g of silica gel 60, spherical, 70-230 mesh; Nacalai Tesque, Inc.), and eluted stepwise with n-hexane (150 mL per step) containing increasing amounts of ethyl acetate (10% per step, v/v) from 20% to 80%, ethyl acetate (150 mL per step), and methanol (300 mL per step).…”

Section: Purification Of the Active Substancesmentioning

confidence: 99%

Phytotoxic Activity and Identification of Phytotoxic Substances from Schumannianthus dichotomus

Rob

Hossen

Iwasaki

et al. 2020

Plants

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The phytotoxic potential of plants and their constituents against other plants is being increasingly investigated as a possible alternative to synthetic herbicides to control weeds in crop fields. In this study, we explored the phytotoxicity and phytotoxic substances of Schumannianthus dichotomus, a perennial wetland shrub native to Bangladesh, India, and Myanmar. Leaf extracts of S. dichotomus exerted strong phytotoxicity against two dicot species, alfalfa and cress, and two monocot species, barnyard grass and Italian ryegrass. A bioassay-driven purification process yielded two phenolic derivatives, syringic acid and methyl syringate. Both constituents significantly inhibited the growth of cress and Italian ryegrass in a concentration-dependent manner. The concentrations required for 50% growth inhibition (I50 value) of the shoot and root growth of cress were 75.8 and 61.3 μM, respectively, for syringic acid, compared with 43.2 and 31.5 μM, respectively, for methyl syringate. Similarly, to suppress the shoot and root growth of Italian rye grass, a greater amount of syringic acid (I50 = 213.7 and 175.9 μM) was needed than methyl syringate (I50 = 140.4 to 130.8 μM). Methyl syringate showed higher phytotoxic potential than syringic acid, and cress showed higher sensitivity to both substances. This study is the first to report on the phytotoxic potential of S. dichotomus and to identify phytotoxic substances from this plant material.

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“…The I 50 values of 5‐methoxyflavone, 5,2′‐dimethoxyflavone and methyl caffeate on the cress roots and shoots were 0.24 and 0.079, 1.1 and 0.23 and 0.88 and 0.59 m mol L −1 , respectively. The other isolated substance, abscisic acid, also has been reported to strongly inhibit the root and shoot growth of cress (its I 50 values on the cress roots and shoots were 0.31 and 0.61 μ mol L −1 , respectively) (Kato‐Noguchi et al ).…”

Section: Resultsmentioning

confidence: 99%

“…The methoxy group at the 2′ position might structurally interfere with the activity of 5,2′‐dimethoxyflavone. The other isolated substance, abscisic acid, had strong growth inhibitory activity (its I 50 values on the cress roots and shoots were 0.31–0.61 μ mol L −1 ) (Kato‐Noguchi et al ).…”

Section: Discussionmentioning

confidence: 99%

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Plant growth inhibitory activity and active substances with allelopathic potential of cogongrass (Imperata cylindrica) rhizome

Suzuki

Tominaga

Ohno

et al. 2018

Weed Biology and Management

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Cogongrass (Imperata cylindrica [L.] Raeusch.) is a perennial rhizomatous grass that belongs to the Poaceae and is widely distributed in tropical, subtropical and temperate regions over the world. The grass is strongly invasive and is suggested to have allelopathic potential. However, limited information is available on allelopathic substances in cogongrass rhizomes. Therefore, the allelopathic potential and substances in cogongrass rhizomes were investigated. The extracts of cogongrass rhizomes inhibited the root and shoot growth of barnyard grass, ryegrass, timothy, cress, lettuce and alfalfa. After bioassay-guided separations of the extracts, four growth inhibitory substances, 5-methoxyflavone, 5,2 0 -dimethoxyflavone, methyl caffeate and abscisic acid, were isolated. 5-Methoxyflavone, 5,2 0 -dimethoxyflavone and methyl caffeate significantly inhibited the root and shoot growth of cress at concentrations of ≥0.03-0.3 m mol L −1 and their concentrations required for 50% growth inhibition were 0.079-0.24, 0.23-1.1 and 0.59-0.88 m mol L −1 , respectively. The other isolated substance, abscisic acid, has been reported to have strong growth inhibitory activity. Its concentrations required for 50% growth inhibition on cress were 0.31-0.61 μ mol L −1 . The present study suggests that cogongrass rhizomes might have allelopathic potential and that those four substances might contribute to that potential.

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A Potent Phytotoxic Substance in Aglaia odorata Lour.

Cited by 32 publications

References 15 publications

Isolation and identification of two phytotoxic compounds from the medicinal plant Cassia alata L.

Isolation and identification of two phytotoxic compounds from the medicinal plant Cassia alata L.

Phytotoxic Activity and Identification of Phytotoxic Substances from Schumannianthus dichotomus

Plant growth inhibitory activity and active substances with allelopathic potential of cogongrass (Imperata cylindrica) rhizome

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