Seasonal variations in the leaf surface composition of field grown grapevine plants

• Main Authors: ARSHAD JAVAID, HAMID LATIF SIDDIQUI, QUDSIA KANWAL, ISHTIAQ HUSSAIN
• Format: Article
• Language: English
• Published: Serbian Chemical Society 2009-12-01
• Series: Journal of the Serbian Chemical Society
• Subjects: antibacterial; Mangifera indica; mango; flavonoids; leaves
• Online Access: http://www.shd.org.rs/JSCS/Vol74/No12/05_4409_3926.pdf

Five flavonoids, viz. (–)-epicatechin-3-O-b-glucopyranoside (1), 5-hydroxy-3-(4-hydroxylphenyl)pyrano[3,2-g]chromene-4(8H)-one (2), 6-(p-hydroxybenzyl)taxifolin-7-O-b-D-glucoside (tricuspid) (3), quercetin-3-O-a-glucopyranosyl-(1®2)-b-glucopyranoside (4) and (–)-epicatechin(2-(3,4-dihydroxyphenyl)-3,4-dihydro-2H-chromene-3,5,7-triol) (5), were isolated from the leaves of mango (Mangifera indica L.). The antibacterial activity of different concentrations of these flavonoids (100, 300, 500, 700, 900 and 1000 ppm) was evaluated against four bacterial species, namely Lactobacillus sp., Escherichia coli, Azospirillium lipoferum and Bacillus sp. All the tested concentrations of the five flavonoids significantly reduced the growth of all the five tested bacterial species. However, differences in the antibacterial activity of the flavonoids were evident. Compound 1 exhibited the lowest antibacterial activity, resulting in a 7–75 % reduction in the growth of the different bacterial species. Compound 5 showed the greatest antibacterial activity and the different concentrations reduced the bacterial growth by 45–99.9 %. A. lipoferum and Bacillus sp. showed the highest susceptibility to this compound. Compounds 2–4 also depicted pronounced antibacterial activity. Different concentrations of these compounds decreased bacterial growth by 52–96 %. From the present study, it can be concluded that compound 5 is the most effective of the tested flavonoids against A. lipoferum and Bacillus sp.