Inhibition of methyl jasmonate-promoted senescence in rice leaves by a metal chelator, 2,2′-bipyridine

摘要

The possible mediatory role of transition metals in methyl jasmonate- (MJ-)induced senescence of rice leaves was investigated. Metal chelators(2,2′-bipyridine, 8-hydroxylquinoline and 1,10-phenanthroline) reducedMJ-promoted senescence of rice leaves. The reduction of MJ-promoted senescenceby 2,2′-bipyridine(BP) is closely associated with the decrease in lipidperoxidation and increase in activity of superoxide dismutase (SOD). Our resultssuggest that iron or copper plays a major role in MJ-promoted senescence ofdetached rice leaves. BP-reduced senescence of detached rice leaves induced byMJ was reversed by adding Fe2+ or Cu2+, but notby Mn2+ or Mg2+. Reduction of MJ-promotedsenescence of detached rice leaves by BP is most likely mediated throughchelation of iron or copper and an increase in SOD activity.