Methyl jasmonate elicits a differential antioxidant response in light- and dark-grown canola (Brassica napus) roots and shoots
2002
Comparot, S.M. | Graham, C.M. | Reid, D.M.
Since jasmonates have been shown to mimic some of the plant's responses to stress, the effect of methyl jasmonate on antioxidant enzymes and compounds was investigated in roots and shoots of light- and dark-grown canola (Brassica napus cv. Westar). The pattern of superoxide dismutase isoforms activity was also investigated. When enzyme activities were calculated on a per gram of fresh weight basis, nearly all enzymes examined showed enhanced activity. However, when these activities were calculated based on the amount of protein, methyl jasmonate induced an increase only in superoxide dismutase activity in the roots of both light- and dark-grown seedlings. The ascorbate level was found to be higher in treated shoots, whereas the glutathione level was found to be higher in treated roots. We conclude that the plant's antioxidant response to methyl jasmonate may be mainly determined by the type of tissue rather than by the light conditions. However, this last factor appeared to be involved in some antioxidant component response, e.g. catalase activity and glutathione content.
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