Plant growth-promoting bacteria elevate the nutritional and functional properties of black cumin and flaxseed fixed oil.
BACKGROUND
In order to study the influence of plant growth-promoting bacteria (PGPB) belonging to Streptomyces sp., Paenibacillus sp., and Hymenobacter sp. on fixed oil content of flaxseed and black cumin, 2-year field experiments were conducted. PGPB was applied during seedtime of plants. The extraction of oil from seeds was performed using supercritical CO2 .


RESULTS
The addition of PGPB significantly increases the content of C18:1 (from 16.06 ± 0.03% to 16.97 ± 0.03%) and C18:3 (from 42.97 ± 0.2% to 45.42 ± 0.5%) in flaxseed oil and C18:2 (from 52.68 ± 0.50% to 57.11 ± 0.40%) and C20:2 (from 4.34 ± 0.02% to 4.54 ± 0.03%) in black cumin seed oil. The contents of total polyphenols, flavonoids, and carotenoids, as well as antioxidant activity measured by ferric-reducing ability of plasma assay, were found to be greater in the oil from the seeds of plants treated with the PGPB, compared with the respective non-treated samples.


CONCLUSION
The use of PGPB enhances plant nutritive properties; these represent a great source for obtaining valuable functional food ingredients. © 2017 Society of Chemical Industry.
['Dimitrijević|Snežana|S|http://orcid.org/0000-0001-8729-6307', 'Pavlović|Marija|M|', 'Maksimović|Svetolik|S|', 'Ristić|Mihajlo|M|', 'Filipović|Vladimir|V|', 'Antonović|Dušan|D|', 'Dimitrijević-Branković|Suzana|S|']
D059827:Agricultural Inoculants D041963:Bacteroidetes D019597:Flax D031881:Nigella sativa D009753:Nutritive Value D056507:Paenibacillus D010938:Plant Oils D012639:Seeds D013302:Streptomyces
plant growth-promoting bacteria (PGPB) antioxidative activity Linum usitatissimum Nigella sativa fatty acids content