Variation in the phytotoxic activity of Tinospora tuberculata extracts as influenced by solvent type and chemical profile

Abdul Shukor, Juraimi and Muhammad Saiful, Ahmad Hamdani and Farzad, Aslani (2016) Variation in the phytotoxic activity of Tinospora tuberculata extracts as influenced by solvent type and chemical profile. Current Science, 110 (2). pp. 228-234. ISSN 00113891

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Abstract

A study was conducted to evaluate the role of secon-dary metabolites on the allelopathic activity of metha-nol and water extracts obtained from aerial parts of Tinospora tuberculata on seed germination and the radicle and hypocotyl lengths of barnyardgrass. The higher suppressive effects were observed on germina-tion and seedling growth of barnyardgrass, when the methanol extracts of Tinospora tuberculata stem or leaf were applied in comparison to the water extracts. Ultra-fast liquid chromatography analysis confirmed that methanol extracts and leaf extracts contained higher number and amount of chemical compounds than did those of the water extracts and stem extracts respectively. Moreover, the concentrations of 11 iden-tified compounds of the extracts and an equimolar mixture of the chemicals required for 50% growth in-hibition on barnyardgrass germination, radicle and hypocotyle were determined. Trans-cinnamic acid and benzoic acid had the highest allelopathic activity, while chlorogenic acid and orientin had the lowest on the basis of the rank values. Benzoic acid was found in the highest concentration in the methanol leaf extract, while this compound was not identified in the water leaf extract. On the other hand, the predominant compound was orientin for stem extracts. These re-sults suggest that these compounds may be involved in the allelopathy activity of Tinospora tuberculata de-pending on their number, concentration, combination and inhibitory activity. Tinospora tuberculata could be a potential source of natural inhibitor compounds employable for eco-friendly agriculture.

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