| Summary: | Magister Scientiae - MSc (Biotechnology) === Nitric oxide is a signalling gaseous molecule endogenously synthesized from
various enzymatic and non-enzymatic sources in plants. It is known to play a
crucial role in the regulation of plant physiological processes such as growth,
development and response to abiotic and biotic stresses. In contrast, reactive
oxygen species also act as signalling molecules controlling processes such as
growth, differentiation and response to abiotic and biotic stresses. Due to the
camaraderie between nitric oxide and reactive oxygen species in the regulation of
physiological processes, the effect of changes in nitric oxide content on a subset
of antioxidant enzyme activities that regulate the levels of reactive oxygen species
in soybean were investigated in this study. In chapters 3 and 4, a decrease in nitric
oxide content using either a nitric oxide synthase inhibitor or a nitric oxide
scavenger, induced changes in the antioxidant activities as well as the isoform
expression patterns of superoxide dismutase, ascorbate peroxidase and catalase.
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