What does this research mean for the field?

Aqueous and methanolic leaf extracts of Brassica juncea inhibit the germination, growth, and photosynthesis of the invasive weed Amaranthus viridis by inducing severe oxidative stress mediated by specific secondary metabolites. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

Evaluate the allelopathic inhibitory effects of aqueous and methanolic Brassica juncea leaf extracts on the germination, growth, photosynthetic efficiency, and redox balance of the weed Amaranthus viridis.

September 2, 2026Discover Plants.Open Access

Secondary metabolites in Brassica juncea (L.) Czern. leaf extracts inhibit Amaranthus viridis L. germination, growth, and PSII photochemistry through oxidative stress

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Authors

SAShikha AroraUniversity of Allahabad THTajammul HusainUniversity of Allahabad KKKewat Sanjay KumarUniversity of Allahabad

Discussion

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Implication

Experimental study demonstrates inhibition of weed growth and photosynthesis in Amaranthus viridis by Brassica juncea extracts, indicating bio-herbicide potential.

Key Points

Evaluate the allelopathic inhibitory effects of aqueous and methanolic Brassica juncea leaf extracts on the germination, growth, photosynthetic efficiency, and redox balance of the weed Amaranthus viridis.
Treated Amaranthus viridis with aqueous and methanolic leaf extracts of Brassica juncea at 5%, 15%, and 25% concentrations to measure germination, growth, photosynthetic pigments, and oxygen evolution.
Assayed oxidative stress markers (superoxide, hydrogen peroxide, malondialdehyde) and antioxidant enzyme activities (superoxide dismutase, peroxidase, catalase, glutathione-S-transferase).
Characterized secondary metabolites in the methanolic leaf extract using Gas Chromatography-Mass Spectrometry (GC-MS).
Methanolic extract produced stronger overall inhibition than aqueous extract, though 5% aqueous extract slightly stimulated shoot length (+6%), root length (+3%), and fresh weight (+2%).
High concentrations (25%) reduced seedling fresh weight by 45% (aqueous) and 61% (methanolic), while disrupting PSII photochemistry and increasing oxidative stress markers despite accelerated antioxidant enzyme activity.
GC-MS identified 47 secondary metabolites, including candidate herbicidal compounds such as 2-methoxy-4-vinylphenol, loliolide, 2-pyrrolidinone, and isothiocyanates.

Cite This Study

Arora et al. (2026) studied this question.

synapsesocial.com/papers/6a97e249c562ede874ec6564 https://doi.org/10.1007/s44372-026-00857-w

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Implication

Experimental study demonstrates inhibition of weed growth and photosynthesis in Amaranthus viridis by Brassica juncea extracts, indicating bio-herbicide potential.

Secondary metabolites in Brassica juncea (L.) Czern. leaf extracts inhibit Amaranthus viridis L. germination, growth, and PSII photochemistry through oxidative stress

Discussion

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Implication

Key Points

Cite This Study

Secondary metabolites in Brassica juncea (L.) Czern. leaf extracts inhibit Amaranthus viridis L. germination, growth, and PSII photochemistry through oxidative stress

Discussion

Member takes

Implication

Key Points

Cite This Study

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