CHEMICAL INVESTIGATIONS OF SOME WEEDS OF VEGETABLE CROPS WITH THEIR GERMINATION AND GROWTH EFFECTS

Abstract

An experiment was conducted on naturally occurring growth substances in aqueous extracts of some common weeds viz., Lazzabati(T)), Tita Begun(T2), Foska begun (T3), Bichuti (T4), Kanainala (Ts), Thankuni (T¢), Shwetodron (T7) for each vegetable crops such as Radish, Tomato and Amaranth with the attempt for chemical investigation on effective weed extract. The aqueous extracts of Tita Begun (Solanum torvum) and Foska Begun (Physalis heterophylla) significantly reduced and delayed germination of radish, tomato and amaranth seeds compared with control. The highest germination percentage consequently 100%, 93.20% and 92.80% and maximum growth of radish, tomato and amaranth in seeds treated with control. The effect of aqueous extract of Tita Begun (Solanum torvum) showed the lowest germination percentage, reduced root and shoot length of radish, tomato and amaranth seedlings. Similarly, the aqueous extract of Foska Begun (Physalis heterophylla) also showed the lowest germination percentage, reduced the root and shoot length of radish, tomato and amaranth seedlings. The Thin Layer Chromatography (TLC) examination of chloroform and ethyl alcohol extracts of Tita Begun (Solanum torvum) was showed four distinct compounds at Hexane: Ethylacetate (8:1, v/v, 4:1, v/v) and chloroform crude extract of Foska Begun (Physalis heterophylla) showed five individual compounds and ethyl alcohol extract of Foska Begun showed four different compounds at Hexane: Ethylacetate (10:1, v/v, 7:1, v/v). Crude compounds were purified and isolated by column chromatography. One of them initially was indicated steroid type compound by Liberman-Berchand reaction. 'H-NMR and study were indicated that the fractions were probably steroid and triterpinoid types compounds which were discussed in details in Results and discussion.