Related Experiment Video
Updated: Jun 17, 2026
09:00
Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice (Oryza sativa ssp.)
Published on: January 28, 2020
Allelopathy and allelopathic substance in the moss Rhynchostegium pallidifolium
Hisashi Kato-Noguchi1, Takahiro Seki, Hideyuki Shigemori
1Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki, Kagawa 761-0795, Japan. hisashi@ag.kagawa-u.ac.jp
Journal of Plant Physiology
|December 19, 2009
Summary
The moss Rhynchostegium pallidifolium exhibits allelopathic activity, inhibiting seedling growth. Researchers identified 3-hydroxy-beta-ionone as the key compound responsible for this effect, likely secreted by the moss.
Area of Science:
- Plant Science
- Ecology
- Natural Products Chemistry
Background:
- Mosses, such as Rhynchostegium pallidifolium, can form dense, pure colonies, suggesting potential allelopathic interactions.
- Allelopathy, the chemical inhibition of one plant by another, plays a significant role in plant competition and community structure.
Purpose of the Study:
- To investigate the allelopathic potential of Rhynchostegium pallidifolium.
- To identify the specific compound responsible for the observed growth inhibition.
- To elucidate the role of this compound in the moss's ecological interactions.
Main Methods:
- An aqueous methanol extract of R. pallidifolium was tested for its effect on various seedling species.
- Purification of the extract led to the isolation of a growth-inhibiting compound.
- Chemical structure elucidation using Mass Spectrometry (MS) and Nuclear Magnetic Resonance (NMR) spectroscopy ((1)H and (13)C).
- Dose-response experiments were conducted on cress seedlings to determine inhibitory concentrations.
Main Results:
- The moss extract significantly inhibited the growth of cress, alfalfa, lettuce, ryegrass, timothy, and Digitaria sanguinalis seedlings.
- 3-Hydroxy-beta-ionone was identified as the active allelochemical.
- 3-Hydroxy-beta-ionone demonstrated significant inhibitory effects on cress shoot and root growth at micromolar concentrations.
- The compound was detected both endogenously in the moss and in the surrounding growth medium and soil, indicating secretion.
Conclusions:
- Rhynchostegium pallidifolium possesses allelopathic properties mediated by 3-hydroxy-beta-ionone.
- The secretion of 3-hydroxy-beta-ionone into the environment likely contributes to the moss's competitive advantage.
- This allelochemical mechanism may explain the formation of pure R. pallidifolium colonies.
Related Concept Videos
01:09Microbe-Plant Interactions
Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...
02:02Responses to Salt Stress
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
02:40Epiphytes, Parasites, and Carnivores
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...
01:23Red Algae
Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
02:11The Roles of Bacteria and Fungi in Plant Nutrition
Plants have the impressive ability to create their own food through photosynthesis. However, plants often require assistance from organisms in the soil to acquire the nutrients they need to function correctly. Both bacteria and fungi have evolved symbiotic relationships with plants that help the species to thrive in a wide variety of environments.
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.