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Changes in the concentration of avenanthramides in response to salinity stress in CBF3 transgenic oat

Oraby, Hesham F., El-Tohamy, Maha F., Kamel, Ayman M., Ramadan, Mohamed F.
Journal of cereal science 2017 v.76 pp. 263-270
avenanthramides, biomass, chemiluminescence, functional foods, genes, nanogold, oats, salinity, salt stress, sodium chloride, stress tolerance, transgenic plants
Oat avenanthramides have long been known to possess potential nutraceutical and therapeutical properties. The change in avenanthramides 2p, 2c and 2f concentration in four salinity tolerant transgenic oat plants containing CBF3 gene and non-transgenic control exposed to different levels of salinity stress was investigated. Determination of oat avenanthramides at the nano-scale level was performed using a well-optimized and highly sensitive sequential injection chemiluminescence (SIA-CL) method enhanced by eco-friendly gold nanoparticles biosynthesized from oat biomass extract. Under the conditions of this study, the predominant avenanthramide, which also exhibited the strongest scavenging capacity, was 2c followed by 2p and 2f. At no stress, there was no significant (p ≤ 0.05) difference between the transgenic lines and control regarding the concentrations of the three determined avenanthramides. After exposure to 250 mmol L−1 NaCl, avenanthramide 2c dramatically increased by 170.9%, 580%, 353.6%, 457.6% and 229.1% in the control and the four transgenic lines, respectively. Among the transgenic lines, Agrogle-1 maintained the highest avenanthramides concentration under all salinity levels with maximum values of 71.5 mg kg−1 for 2p, 221.0 mg kg−1 for 2c and 62.0 mg kg−1 for 2f detected at 250 mmol L−1NaCl. The results of this study demonstrated that oat avenanthramides might have a potential role in enhancing abiotic stress tolerance in oats.