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Changes in Superoxide Dismutase Activity during Thidiazuron-induced Lateral Budbreak of Apple
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1991
Year
BiologyYork ImperialDormant BudsPhysiological Plant PathologyBotanyBiochemistryNatural SciencesSuperoxide Dismutase ActivityPhysiologyThidiazuron-induced Lateral BudbreakSuperoxide DismutasePost-harvest PhysiologyPhytotoxicityPlant PhysiologyOxidative Stress
The effects of thidiazuron on changes in superoxide dismutase (SOD) activity in apple ( Malus domestica Borkh cv. York Imperial) buds during dormancy break were determined. Dormant buds had low SOD activity. Increased SOD activity was correlated with budbreak induced by thidiazuron. Buds contained three distinct forms of SOD: Cu, Zn-SOD; Mn-SOD; and Fe-SOD. Most of the SOD activity in apple buds was attributed to Cu and Zn-SOD, followed by Mn-SOD. Iron-SOD was not present in dormant buds, and only a trace amount was found as buds started rapid expansion. Chemical name used: N -phenyl- N ′-1,2,3,-thidiazol-5-ylurea (thidiazuron).