Potential allelopathic and antibacterial activity from Alternanthera philoxeroides

Abstract

-(Potential allelopathic and antibacterial activity of Alternanthera philoxeroides). Alternanthera philoxeroides is a promising species in the search for new molecules with biological effects. To accelerate this bioprospection process of A. philoxeroides, the chosen methods (allelopathy and discdiffusion technique) are excellent alternatives. The purpose of this study was to evaluate the allelopathic effects and verify the antibacterial properties of extracts from A. philoxeroides. To evaluate the antibacterial activity, disc diffusion technique was used with five reference strains. The germination test was conducted with the extracts at concentrations of 0, 1.0, 2.0 e 3.0 mg mL -1 in a petri dish with 30 lettuce seeds and for the growth trial 10 seeds were used. The experimental design was completely randomized in factorial 4 × 2 × 4 (four extracts, two sources, four concentrations), with four replicates.The results indicate that the lettuce germination was influenced by ethyl acetate fraction obtained from leaves of A. philoxeroides at the highest concentrations; however, the germination speed and the radicle growth were significantly affected by all the extracts starting at 1mg mL-1 concentration. Those results demonstrate allopathic effect of different extracts of this plant, although they have not interfered with the strains growth used in this experiment.

Garcienone, a Novel Compound Involved in Allelopathic Activity of Garcinia Xanthochymus Hook

“…Many approaches concentrate on how to manage weed infestations in an effective way. Even though synthetic herbicides are the most efficient method of weed control, they have enormous hazardous effects on human health and the environment [5,6,7]. In addition, non-judicious and repeated use of synthetic herbicides has resulted in resistant weed biotypes [8,9].…”

“Malancha” [Alternanthera philoxeroides (Mart.) Griseb.]: A Potential Therapeutic Option against Viral Diseases

“…Several phytochemical studies have been performed on this plant [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. While some of these are merely preliminary qualitative and quantitative phytochemical screening without the isolation of any compounds, there are, however, several other thorough phytochemical studies that have led to the isolation and identification of various secondary metabolites from A. philoxeroides.…”

“…The first two alkaloids, phaeophytin A (8) and phaeophytin A' (9), were isolated from the aerial parts of this plant by Fang et al [14]. Later, further alkaloids, N-trans-feruloyl-3,5-dimethoxytyramine (2), N-trans-feruloyl-3-methyldopamine (3), N-trans-feruloyl-tyramine (4), N-cis-feruloyl-tyramine (5), indole-3-carboxaldehyde (6) and indole-3-carboxylic acid (7) were reported from this plant in subsequent years [5,12]. Tyramine derivatives (2)(3)(4)(5), particularly feruloyl, cinnamoyl, or coumaroyl derivatives, are widespread in the plant kingdom.…”

“…Although A. philoxeroides is considered as an obnoxious invasive weed around the globe, because of its long-standing traditional medicinal uses, particularly against various viral infectious diseases, this plant and its secondary metabolites have been subjected to various bioactivity studies, revealing the therapeutic potential of this species [2][3][4][5][6][7][8][9][10][11][12][13][16][17][18]29,43,44,[72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91], particularly as an antiviral agent (Table 1).…”

“…Griseb., commonly known as "Alligator weed" in English, "Malancha shak or Malancha" in Bengali, and "Shergitti" in Santal languages, is a leafy vegetable from the family Amaranthaceae A. L. de Jussieu [1][2][3]. This perennial polymorphic herb is native to China, particularly to the provinces around the Yangtze River, Far East, and South-East Asian countries such Bangladesh, India, Myanmar, and Thailand [1,4,5], and countries from other continents (e.g., Argentina, Brazil, and Paraguay [6,7] (Figure 1). This species also grows in certain areas in Australia, New Zealand, and the USA, where it is considered as an obnoxious invasive weed.…”