Allelopathic assessment of selected tree species from BRIS soil

Nornasuha, Yusoff and Nabil Fikri, Mohd Shahidi and Illa Syafiqah, Johari and Ismail, B.S and Yoshiharu, Fuiji (2018) Allelopathic assessment of selected tree species from BRIS soil. In: 10th International Conference on Plant Protection in the Tropics, 06 Aug 2018, Melaka.

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Abstract

Laboratory experiments were conducted to screen the allelopathic activity of the leaf litter leachate and leaf volatilization of ten different tree species by using sandwich and dish pack method, respectively. The leaves from ten tree species that were collected from Besut District of Terengganu were used as plant materials of donor plants. The site of the study was composed of BRIS (Beach Ridges Interspersed with Swales) soil. Lactuca sativa (lettuce) were used as the receptor plants for both methods. In sandwich method, the lettuce seedlings growths were tested using different amounts of leaf litter (5 mg, 10 mg and 50 mg) in agar media. Whilst, in dish pack method, the lettuce seedlings growth were evaluated through the different distances of the leaves from donor plants towards the lettuce seedlings (41 mm, 58 mm, 82 mm and 92 mm). The results from sandwich method showed that the highest radicle inhibition was by Tamarindus indica (81%) followed by Terminalia catappa (57.22%) and Leucaena leucocephala (54.13%); whereas, the highest hypocotyl inhibition was by Tamarindus indica (63.70%), followed by Leucaena leucocephala (27.75%) and Melaleuca cajuputi (27.08%). On the other hand, for the dish pack method, the leaf volatilization of Acacia mangium (33.80%) showed the highest inhibition of radicle while Melaleuca cajuputi (29.69%) showed the highest inhibition of hypocotyl compared to nine other species. The screening test of leaf litter leachate and leaf volatilization in these experiments provided the clear clue for the presence of allelochemicals in the tree species in BRIS soil. The leaf litter leachate of screened tree species were found to be more allelopathic than leaf volatilization. It is recommended that further research be conducted on the identification and characterization of allelochemicals using these data as benchmark information for development of botanical natural herbicides from tree species.

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