Abstract: The energy and activated oxygen metabolisms in male-sterile and fertile anthers of Hubei photoperiod-sensitive genic male-sterile rice (HPGMR)have been comparatively studied. Among the male-sterile anthers, lower total activities of cytochrome oxidase(COD), ATPase, peroxidase (POD), catalase (CAT) and superoxide dismutase(SOD) in six anthers of a spikelet were seen, which were equivalent to about 2–64%, 20–76%, 26–60%, 6–77%, 29–55%, respectively, of those of their fertile counterparts during different development stages of pollens. The sterile anthers lacked 1–5, 1, 1–2 isozyme bands of COD, POD and SOD, respectively, and also displayed lower content of ATP, higher contents of H202 and malondiald ehyde (MDA) and higher efficiency of O2- which were equivalent to about 14–77%, 152–424%, 153–238%, 230–340%, respectively, of those of their corresponding fertile ones. It is concluded that the physiological features of male-sterile anthers, viz. lower efficiency of oxidative phosphorylation, higher efficiency of O2 and H202 generation, weaker activity of scavenger system of activated oxygen and higher level of lipid peroxidation, are indicative of some relationship between abnormal energy, activated oxygen metabolisms in male-sterile anthers and male-sterility in HPGMR.

Key words: Hubei photoperiod-sensitive genic male-sterile rice, Oxidative phosphorylation, Activated oxygen, Male-sterility