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Role of superoxide dismutases during petal senescence in rose (<i>Rosa hybrida</i>L.)
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2007
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SummaryThe involvement of oxidative stress and the role of superoxide dismutases (SOD) in petal senescence were studied in rose. Two popular rose cultivars, ‘Grandgala’ and ‘First Red’, were harvested at six different stages of development and petals were separated from the seven whorls in each flower. The results revealed that rose petal senescence was associated with a higher production of O2.– radicals (approx. 10-fold up to Stage-4). A parallel increase in SOD activity was also noted in different petals whorls up to Stage-4, which declined thereafter. Different isoforms of SOD exhibited variable levels of activity, with Cu/Zn-SOD being the most active, followed by Mn-SOD, and Fe-SOD. A significant decline in SOD activity appeared to be associated with petal senescence.