Enhancing biosynthesis and bioactivity of Trachyspermum ammi seed essential oil in response to drought and Azotobacter chroococcum stimulation

Chemical and Biological Technologies in Agriculture

Table 2 The antioxidant activity of seeds essential oil upon different treatments and vitamin c as reference antioxidant in FRAP and ABTS assays

Treatments	Ferric reducing antioxidant power	ABTS scavenging activity
Treatments	IC50 (μg/mL)
T1	217.1^a ± 1.15	113.5^a ± 2.02
T2	205.6^b ± 2.29	100.8^b ± 1.19
T3	169.7^c ± 1.07	62.0^c ± 0.65
T4	158.3^d ± 2.81	58.4^d ± 2.07
T5	149.2^f ± 2.36	53.8^f ± 2.85
T6	152.6^e ± 1.95	56.3^e ± 1.96
Vitamin C	22.7^g ± 1.85	14.5^g ± 2.15
SEM	2.23	2.18

Means with different letters in the same columns show significant differences at p < 0.05
T1: control (Irrigation at 100% filed capacity), T2: T. ammi treated by A. chroococcum bacteria (Irrigation at 100% filed capacity), T3: T. ammi under slight drought stress (Irrigation at 80% filed capacity), T4: T. ammi under moderate drought stress (Irrigation at 60% filed capacity), T5: T. ammi treated by A. chroococcum bacteria under slight drought stress (Irrigation at 80% field capacity), T6: T. ammi treated by A. chroococcum bacteria under moderate drought stress (irrigation at 60% field capacity)