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Related Concept Videos

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Plants often form mutualistic relationships with soil-dwelling fungi or bacteria to enhance their roots’ nutrient uptake ability. Root-colonizing fungi (e.g., mycorrhizae) increase a plant’s root surface area, which promotes nutrient absorption. While root-colonizing, nitrogen-fixing bacteria (e.g., rhizobia) convert atmospheric nitrogen (N2) into ammonia (NH3), making nitrogen available to plants for various biological functions. For example, nitrogen is essential for the biosynthesis of the...
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Related Experiment Video

Updated: Jun 2, 2026

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice (Oryza sativa ssp.)
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[Allelopathy of Andrographis paniculata vegetative].

Ming Li1, Xiao-Yan Zhou, Zhan-Hong Lu

  • 1Guangdong Pharmaceutical College, Guangzhou 510006, China. lm862002@yahoo.com.cn

Zhong Yao Cai = Zhongyaocai = Journal of Chinese Medicinal Materials
|May 10, 2011
PubMed
Summary
This summary is machine-generated.

Andrographis paniculata extracts exhibit allelopathic effects on cabbage, radish, and Desmodium styracifolium. Different plant parts and concentrations influenced seed germination and seedling growth, with varying promotion and inhibition observed.

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Area of Science:

  • Agroecology
  • Plant Physiology
  • Phytochemistry

Context:

  • Intercropping and companion planting are crucial for sustainable agriculture.
  • Understanding plant interactions is key to optimizing crop yields and resource utilization.
  • Allelopathy, the chemical inhibition of one plant by another, plays a significant role in plant communities.

Purpose:

  • To investigate the allelopathic potential of Andrographis paniculata extracts on Brassica chinensis, Raphanus sativus, and Desmodium styracifolium.
  • To determine the differential effects of Andrographis paniculata root, stem, and leaf extracts on seed germination and seedling development.
  • To provide theoretical insights for the practical application of Andrographis paniculata in mixed cropping systems.

Summary:

  • Aqueous extracts from Andrographis paniculata roots, stems, and leaves were tested against seeds and seedlings of Brassica chinensis, Raphanus sativus, and Desmodium styracifolium.
  • Significant allelopathic effects were observed, with root extracts showing the strongest inhibition on Brassica chinensis germination. Stems and leaves also demonstrated notable effects.
  • Root growth was generally inhibited across receptor species. Seedling height responses varied, with low concentrations sometimes promoting growth and high concentrations inhibiting it, particularly in Raphanus sativus and Desmodium styracifolium.

Impact:

  • This study provides valuable data on the allelopathic interactions of Andrographis paniculata, informing its use in polyculture systems.
  • Findings contribute to the development of sustainable agricultural practices through informed companion planting strategies.
  • The research highlights the concentration-dependent and species-specific nature of allelopathic effects, crucial for agricultural applications.