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02 - Allelopathic Effects of Paper Mulberry (Broussonetia papyrifera(L.) L’Hér. ex Vent.) Extracts to the Morpho-Physiological Characteristics of Supa (Sindora supaMerr.) Seedlings

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XXV IUFRO WORLD CONGRESS

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Abstract

The study investigated the allelopathic potential of the leaves, stem and root aqueous extract of Broussonetia papyrifera using Sindora supa as a test plant for morpho-physiological implication. Parameters (height increment, root collar diameter increment, sturdiness quotient, leaf number increment, leaf area, chlorophyll content, net photosynthesis, transpiration, stomatal conductance, and water use efficiency (WUE), were tested at particular B. papyrifera extract concentration of 10%, 15%, 20% and 30%. Results indicated that stem and root extracts of B. papyrifera deterred the height of the test plant at 20% and 30%, respectively. Stem extract, on the other hand, stimulated the root collar diameter growth of S. supa at 15% concentration level. Essentially, a stimulatory response is observed at low concentration levels, while deterrence transpires along increasing concentrations. The same trend holds true in parameters, such as leaf area, chlorophyll count, net photosynthesis and WUE (stem extract). Transpiration, stomatal conductance and WUE (root extract) incurred variable response along increasing concentration levels. Seeds are more vulnerable to allelochemicals as compared to the 4-month old seedlings of S. supa (leaf extract). It can be concluded that increasing levels of B. papyrifera root and shoot extracts inhibit the growth of S. supa, indicating B. papyrifera’s allelophatic effect and dominance. Hence, this has implications in an effort to conserve native species and prevent the proliferation of invasive exotic species in the area. Further research on the allelopathic potential of the flowers and fruits of B. papyrifera is recommended, coupled with chemical characterization, to determine its full detrimental effect on natural forest areas, and to recognize the interplay of different chemicals affecting the morpho-physiological dynamics of the affected plant.

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© Copyright 2020 Morressier GmbH.
All rights reserved.