Comparison of Respiratory Pathways of CMS and Its Main-tainer mce (Oryza sativa L. )

The respiraion in panicle,leaf and anther of the cytoplasmic malesterile(CMS) rice Zhenshan 97A and inthose of its maintainer fertile Zhenshan97B was compared. The results showedthat total respiratory rate (Vt) and therate of alternaive respiration (Valt )(Table 1 ) and activities of cytochromeotidase (COD ), malate dehydrogenase(MDH ) and 6-phosphoglucose dehydrogenase (6-PGDH) (Fig. 1) in the antherof the sterile line were lower than thosein the fertile line; but such differenceswere no found between the leaves of thesterile line and the fenile line, and onlythe activity of 6-PGDH was lower in thepanicle of the sterile line than that of fertile line. 70% of Vt in the leaves andthe pbocles of the CMS line and itSrnaintalner line was inhibited by malonicacid, but only 30% of Vt (aPart bothat of the pancle of the CMS line,which was 24%) was inhibited byNa3PO4 (Tabe 2). These resultS sug-gested tha Inan resPiratory characteris-hcs were different in the anthr of thesterile line and the fenile line, and therewas dtherence in the operational level ofpentose-phosphate pathway in the twcleof the sterile line and the fenile line.