Abstract:Some physiological and biological characters of three types of two-line F1 hybrid rices: Indica-Japonica (W61 54s/02428), Indica-Javanica (W6154s/Lunhui422), Indica-Indica (W6154s/Lemoney) were studied. The analyses of tillering ability, amylase activity of germinated seeds, and absorption capacity of roots at seedling stage showed a tendency to be in the order W61 54s/02428 >W6154s/Lunhui422 >W61 54s/Lemoney >Weiyou 64. Root absorption capacity of two-line F1 hybrid rices during seed sprouting showed nega...