XVI International Botanical Congess

F1 and restored plants, of a cms line from a cross of a Chinese Glycine max wildtype soybean with a Chinese wild annual G. soja, were exposed to temperature and photoperiod regimes to assess the stability of the cms system during flowering and pod set. Anthers of all stages were studied cytologically. Results confirm the environmental stability of the cms system. During microsporogenesis and microgametogenesis, anthers with restored fertility showed a constant influx and storage of carbohydrates, while the cms anthers showed a progressive decline in carbohydrates after meiosis. Cytological differences between the cms and normal line were associated with progressive degenerative anatomical changes.