Chemical Characterization and Phytotoxic Effects of the Aerial Parts of Ruzigrass (<i>Urochloa ruziziensis</i>)

Moreno, Beatriz Pereira; Mantovanelli, Gislaine Cristiane; Ricardo, Letycia Lopes; Silva, Adriano Antonio; Oliveira, Rubem Silvério de; Ishii–Iwamoto, Emy Luiza; Sarragiotto, María Helena; Baldoqui, Débora Cristina

doi:10.1002/cbdv.201900694

Cited by 5 publications

(4 citation statements)

References 48 publications

(92 reference statements)

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“…This molecule has been reported to be phytotoxic on the germination and development of Bidens pilosa . The results in the experiment of Pereira‐Moreno et al 56 . showed that P‐CA inhibited approximately 33.5% root and total lengths compared to untreated controls.…”

Section: Discussionmentioning

confidence: 96%

Testing the role of allelochemicals in different wheat cultivars to sustainably manage weeds

Álvarez

Otero

Prieto

et al. 2023

Pest Management Science

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Background: Selecting wheat varieties with allelopathic potential or high competitiveness against weeds is a sustainable solution for organic farming to eliminate the use of synthetic herbicides. Wheat is one of the most economically important crops. This study focuses on screening the allelopathic or competitive potential of four wheat cultivars, Maurizio, NS 40S, Adesso and Element, on two weeds of interest due to acquired herbicide resistance, Portulaca oleracea and Lolium rigidum, through germination and growth bioassays and the identification and quantification of benzoxazinoids (BXZs) and polyphenols (phenolic acids and flavonoids).Results: The different cultivars showed different abilities to manage surrounding weeds and different capacity to exude or accumulate specialized metabolites in the presence of those weeds. Furthermore, each cultivar behaved differently depending on the weed present in the medium. The most efficient cultivar to control the tested monocot and dicot weeds was Maurizio, as it effectively controlled germination and growth of L. rigidum and P. oleracea while exuding large amounts of benzoxazinones through the roots, especially the hydroxamic acids 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one and dihydroxy-2H-1,-4-benzoxaxin-3(4H)-one. By contrast, NS 40S, Adesso and Element showed the potential to control the growth of just one of the two weeds through allelopathy or competition.Conclusion: This study reveals that Maurizio is the most promising wheat cultivar for sustainable weed control, and that the screening of crop varieties with allelopathic potential, which results in the displacement of synthetic herbicides, is an immediate solution in ecological and sustainable agriculture.

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Section: Discussionmentioning

confidence: 96%

Testing the role of allelochemicals in different wheat cultivars to sustainably manage weeds

Álvarez

Otero

Prieto

et al. 2023

Pest Management Science

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“…Among phenols and phenolic acids, only coumaroylquinic acid was more concentrated in L than in S macerates (Figure 4). In the same family, coumaric acid has been reported to show phytotoxicity toward seed germination of several species [25,26]. We therefore conducted germination tests at coumaric acid concentrations of 10 −5 and 2.2 × 10 −5 M. No effect on the two species was observed at 10 −5 M. Inhibition of Trifolium repens germination, however, was observed at 2.2 × 10 −5 M (R = 7.7 ± 1.6 compared to 12.0 ± 0.5 for the control, p = 0.021).…”

Section: Chemical Analysismentioning

confidence: 99%

Phytotoxic Effect of Macerates and Mulches from Cupressus leylandii Leaves on Clover and Cress: Role of Chemical Composition

Khaled

Sleiman

Goupil

et al. 2020

Forests

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The use of plant secondary metabolites is an attractive strategy to control weeds. In this work, cypress (Cupressus leylandii) leaves were collected and tested as aqueous macerates or mulches for their ability to control seed germination and seedling growth of Trifolium repens and Lepidium sativum. Leaves were collected on trees facing the north (S) or facing the sun (L). The rate of seed germination measured on sand was drastically slowed down by the cypress leaves after 8 d of maceration, reaching inhibition of >85% compared to the control at 7 d post-imbibition (dpi). Analysis of macerates by UHPLC-MS revealed the presence of organic acids, phenols, and sugars in amounts increasing with maceration time and the phytotoxic effect. A 5 cm layer of cypress leaf mulch also significantly reduced (p < 0.001) the rate of seedling appearance of Lepidium sativum measured on potting soil compared to the control. Mulches prepared using L leaves were more efficient than those prepared with S leaves (p = 0.0029). Analysis of ethanolic extracts of leaves by mass spectrometry (MS) coupled to liquid (UHPLC) or gas chromatography (GC) showed the presence of a variety of monoterpenes, monoterpenoids, and diterpenoids with a labdane backbone. They were all more concentrated in mulches prepared with L leaves than those prepared with S leaves, in particular diterpenoids, which were about 10-fold more concentrated. However, the identification of phytotoxic components needs further research. It is concluded that due to their phytotoxic properties, Cupressus leylandii leaves could be used as mulch or macerate for target treatment of weedy areas.

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“…Previous studies have shown that Urochloa ruziziensis (R. Germ. and CM Evrard) Crins (basionym Brachiaria ruziziensis), when used as cover crop, reduces the emergence of certain plants and weeds in the field [14][15][16][17][18]. According to Moreno et al [18], eight compounds were isolated from U. ruziziensis: friedelin, oleanolic acid, α-amyrin, 1-dehydrodiosgenone, sitosterol and stigmasterol glycosides, tricin and p-coumaric acid.…”

Section: Introductionmentioning

confidence: 99%

“…and CM Evrard) Crins (basionym Brachiaria ruziziensis), when used as cover crop, reduces the emergence of certain plants and weeds in the field [14][15][16][17][18]. According to Moreno et al [18], eight compounds were isolated from U. ruziziensis: friedelin, oleanolic acid, α-amyrin, 1-dehydrodiosgenone, sitosterol and stigmasterol glycosides, tricin and p-coumaric acid. The phytotoxic effects of crude methanolic extract and fractions of ruzigrass were assessed using germination rate, initial seedling growth, and biomass of Bidens pilosa, Euphorbia heterophylla and Ipomoea grandifolia, as B. pilosa was the most affected by fractions of ruzigrass.…”

Section: Introductionmentioning

confidence: 99%

Allelopathic Potential of Plant Aqueous Mixtures on Euphorbia heterophylla

et al. 2020

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Euphorbia heterophylla is a widely distributed weed whose seeds can remain viable in the soil for years, competing with crops. Therefore, natural herbal preparations could be a solution for its more diversified management. This study investigates the efficacy and mode of action of aqueous mixtures of Urochloa ruziziensis stems and Sorghum bicolor roots and stems on E. heterophylla seed germination, seedling development, antioxidant enzyme activity, and respiration. Aqueous mixtures with concentrations of 0 (control), 250, 500, 750 and 1000 ppm were prepared. E. heterophylla seeds were treated with the mixtures and incubated under controlled conditions. Seedling development, respiration, and enzyme activity were assessed after 4 days of incubation and germination was analyzed after 16 days. Urochloa ruziziensis and S. bicolor mixtures presented allelopathic effects on E. heterophylla inhibiting root growth, root fresh and dry weights and induced mitochondrial alterations resulting in oxidative stress, increasing the antioxidant enzymes catalase and peroxidase. U. ruziziensis and S. bicolor aqueous mixtures were found to have potential in controlling the weed E. heterophylla in laboratory tests.

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Chemical Characterization and Phytotoxic Effects of the Aerial Parts of Ruzigrass (Urochloa ruziziensis)

Cited by 5 publications

References 48 publications

Testing the role of allelochemicals in different wheat cultivars to sustainably manage weeds

Testing the role of allelochemicals in different wheat cultivars to sustainably manage weeds

Phytotoxic Effect of Macerates and Mulches from Cupressus leylandii Leaves on Clover and Cress: Role of Chemical Composition

Allelopathic Potential of Plant Aqueous Mixtures on Euphorbia heterophylla

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