THE RELATIONSHIP BETWEEN RESPIRATION AND ACTIVATED OXYGEN METABOLISM IN CYTOPLASMIC MALE STERILE RICE

Abstract:

The superoxide radical (O₂^-.) formation rates in the young panicles and anthers ofcytoplasmic male sterile (CMS) rice Zhenshan 97A (97A) and its maintainer Zhenshan 97B(97B) were inhibited by KCN, and accelerated by salicylhydroxamic acid (SHAM), but thepercentage of O₂^-. formation inhibited by KCN or accelerated by SHAM in sterile rice 97Awas more than that in fertile rice 97B. The malondialdehyde (MDA) content in both of 97A and 97B increased after KCN or SHAM treatment, but the great change of MDA was found in 97B treated by KCN or in 97A treated by SHAM. Superoxide dismutase (SOD) activity was inhibited by KCN, but was not affected by SHAM. The respiratory rates of 97A or 97B decreased after H₂O₂＋FeSO₄ treatment H₂O₂ while it did not change by treatment alone.