Abstract:
In this experiment, sub1A quantitative trait loci (sub1A QTL) of rice were evaluated for
dehydration responses through different aspects of cellular responses. Through variations of
dehydration exposure, rice seedlings recorded a significant increase in superoxide (O2.
-
) and
hydrogen peroxide (H2O2), the former by 1.80 fold and the latter by 2.10 fold. Nicotinamide
adenine dinucleotide phosphate oxidase activity fairly correlated with lipid peroxidation (r =
1.96). Both 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-
sulphonic acid) (ABTS) had similar IC50 values over the control at p ≤ 0.05. Reducing power of
the extract had 1.31 fold increase. The antioxidant moieties like total phenolics and flavonoids
were 1.04 and 1.23 fold upregulated under stress. On the other hand anthocyanin and
glutathione (GSH) did not vary much under stress except at maximum duration of stress.
Superoxide dismutase (SOD) was initially stable but maximized at 8 days by 1.30 fold increase.
On the contrary, guaiacol peroxidase (GPX) was seen to be downregulated by 40.94% all
through the days of stress. Catalase (CAT) activity followed a similar trend, but was not
significant as compared to control.
