Allelopathic Potential of Sorghum bicolor at Different Phenological Stages

Zucareli, Valdir; Coelho, Érica Marusa Pergo; Fernandes, Weisler; Peres, Eduardo Mergen; Stracieri, Juliana

doi:10.1590/s0100-83582019370100019

Cited by 8 publications

(8 citation statements)

References 25 publications

(27 reference statements)

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“…The blend was stirred to obtain a homogeneous mixture, left to decant for 24 hours. Subsequently, filtering was performed using filter paper, and then solutions of 25, 50, 75, and 100 g.L -1 were prepared by diluting the final extract (Zucareli et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

ALLELOPATHIC EFFECT OF Sorghum bicolor AND Digitaria insularis ON GERMINATION AND INITIAL DEVELOPMENT OF CANOLA

Campos

Sousa

Rego

et al. 2020

Rev. Agric. Neotrop.

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Agriculture depends on biotic and abiotic factors, and one of them is allelopathy, defined as the chemical interference that one plant has on others, which can negatively affect germination. The objective of this work is to evaluate the allelopathic effects of Sorghum bicolor and Digitaria insularis on seed germination and initial development of canola seedlings (Brassica napus L.). A completely randomized design was used in a 2x5 factorial scheme (two extracts: D. insularis and S. bicolor) and five concentrations (0, 25, 50, 75, and 100%), with four replicates of fifty seeds, the plot being constituted by a 'gerbox' box containing 50 seeds evenly distributed. The variable analyzed were germination percentage (G), abnormal seedlings (AS), dead seeds (DS), length of the shoot (SL) and primary root (RL), total length (TL) of the seedling, shoot ratio (S/T), and root ratio (R/T). The aqueous extracts of D. insularis interfere in all variables studied, which compromises the formation of normal seedlings, regardless of concentration. The extract of S. bicolor expressed allelopathic effects only in concentrations above 75%. Both species can inhibit the initial development of canola plants.

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Section: Methodsmentioning

confidence: 99%

ALLELOPATHIC EFFECT OF Sorghum bicolor AND Digitaria insularis ON GERMINATION AND INITIAL DEVELOPMENT OF CANOLA

Campos

Sousa

Rego

et al. 2020

Rev. Agric. Neotrop.

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show abstract

“…In addition, the allelochemicals present in sorghum tissues may vary in different parts of the plant. The allelopathic potential of S. bicolor can be used to control weeds by means of the application of sorghum residues as mulch or including sorghum cultivars in a crop rotation [32] According to Narwal et al [33], the infestation of monocotyledon weeds was reduced between 79 and 91%, and dicotyledon infestation was reduced between 84 to 100% when pearl millet was grown as a forage species. Competition and allelopathic effects performed, during the coexistence of the cover crop with the weeds can be responsible for the suppressive effect.…”

Section: Resultsmentioning

confidence: 99%

Management of Eleusine indica and Digitaria insularis with Herbicides in Association with Cover Plants

Ramos

Santos

Schendenffeldt

et al. 2021

JEAI

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Aims: This study aimed to evaluate the control of Eleusine indica Gaertn. and Digitaria insularis (L.) Fedde through the combination of soil cover with green manure straw and herbicides applied in pre-emergence. Study Design: Each weed species was evaluated in different experiments. The experiments were set up in a greenhouse in a completely randomized design and arranged in a factorial scheme (5×4)+2, with four replications. Place and Duration of Study: Center of Agricultural Sciences, São Paulo, Brazil, from May 2019 to May 2020. Methodology: Seeds of Digitaria insularis and Eulesine indica were sown at a depth of 1 cm from the soil surface. Then, the pots were watered, and the straw of Cajanus cajan, Sorghum bicolor, Crotalaria juncea, Crotalaria spectabilis, and Crotalaria breviflora was deposited on the surface. The pre-emergence herbicides trifluralin (900 g ai ha−1), pendimethalin (1200 g ai ha−1), clomazone (1000 g ai ha−1), and s-metolachlor (1920 g ai ha−1) were applied one day after the weed seeds were sown. The percentage of weed control was evaluated at 10, 20, and 30 days after emergence (DAE). The plant shoot was cut at 30 DAE and the weight of dry biomass was determined. The control without herbicide and with soil cover crop and no herbicide and no soil cover were also evaluated. Results: Sorghum bicolor, Cajanus cajan, and Crotalaria breviflora were the most effective in controlling Eleusine indica when no herbicide was applied. Only Sorghum bicolor showed a satisfactory control of Digitaria insularis without the use of chemical management (above 80%). The association of pre-emergence herbicides with soil cover showed high control of weeds. Conclusion: The results showed that the association between chemical and cultural methods is an effective alternative to control Eulesine indica and Digitaria insularis.

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“…Zucareli et al [31], found that S. bicolor aqueous extract exerted a dose-dependent inhibitory effect on cabbage germination and initial growth. Extracts were obtained from pre-flowering plants (60 days after emergence), as also performed in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…Although U. ruziziensis and Sorghum bicolor L. Moench have been shown to exert inhibitory effects on the germination and growth of various weeds, including E. heterophylla [6,30,31], little is known about the biochemical effects of their allelochemicals on target weeds, particularly on mitochondrial metabolism. Given the herbicidal and growth regulatory effects of allelochemicals, added to the competition generated by allelopathic plants against weeds, it is crucial to identify which molecules act as allelochemicals and understand their action on plant cells.…”

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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Allelopathic Potential of Sorghum bicolor at Different Phenological Stages

Cited by 8 publications

References 25 publications

ALLELOPATHIC EFFECT OF Sorghum bicolor AND Digitaria insularis ON GERMINATION AND INITIAL DEVELOPMENT OF CANOLA

ALLELOPATHIC EFFECT OF Sorghum bicolor AND Digitaria insularis ON GERMINATION AND INITIAL DEVELOPMENT OF CANOLA

Management of Eleusine indica and Digitaria insularis with Herbicides in Association with Cover Plants

Allelopathic Potential of Plant Aqueous Mixtures on Euphorbia heterophylla

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