ALLELOPATHIC EFFECTS OF PLANT LITTER FROM Eleusine indica (L.) Gaertn, Kyllinga brevifolia Rottb. AND Sphagneticola trilobata (L.) Pruski ON THE GERMINATION AND GROWTH OF LETTUCE (Lactuca sativa L.)

Dang, Duy Tan (2025) ALLELOPATHIC EFFECTS OF PLANT LITTER FROM Eleusine indica (L.) Gaertn, Kyllinga brevifolia Rottb. AND Sphagneticola trilobata (L.) Pruski ON THE GERMINATION AND GROWTH OF LETTUCE (Lactuca sativa L.). S2 thesis, Universitas Andalas.

	Text (Cover & Abstract) Cover & Abstract.pdf - Published Version Download (273kB)
	Text (CHAPTER I) CHAPTER I.pdf - Published Version Download (184kB)
	Text (CHAPTER V) CHAPTER V.pdf - Published Version Download (160kB)
	Text (REFERENCES) REFERENCES.pdf - Published Version Download (275kB)
	Text (THESIS FINAL) THESIS DANG DUY TAN FINAL (21-8-2025).pdf - Published Version Restricted to Repository staff only Download (2MB)

Abstract

This study aims to analyze the allelopathic potential of three common weed species: Eleusine indica, Kyllinga brevifolia and Sphagneticola trilobata on the germination and growth of lettuce (Lactuca sativa), a known bioindicator species for phytotoxicity. The experiment was conducted from February to June 2025, using two bioassay approaches: the sandwich method in laboratory and pot experiment in greenhouse with different concentrations of weed litter (0%, 1%, 2%, 3%, and 4% (w/v for sandwich method and w/w for pot experiment). Results from the germination tests showed that all three weed species significantly reduced the germination percentage of L. sativa in a concentration-dependent manner, with the most severe inhibition under observed S. trilobata treatment. Similarly, seedling development measured through hypocotyl and radicle elongation was progressively suppressed by increasing litter levels. Among the three, S. trilobata showed the strongest allelopathic effect, followed by K. brevifolia, while E. indica showed a more variable response, with certain growth parameters showing mild stimulation at specific concentrations. In pot experiment, the growth of L. sativa seedlings (shoot/root length and biomass) was significantly inhibited by both K. brevifolia and S. trilobata, supporting the hypothesis that their phytotoxic effects are mediated by allelochemicals. Conversely, E. indica showed a complex response: while root length was suppressed, shoot and root biomass increased slightly at moderate concentrations, likely due to slow decomposition and indirect soil modifications.

Actions (login required)

View Item