Abstract: Immersed into the solutions containing 0.5, 2.5 and 10.0mmol/L Ca2+ respectively and aerated at the speed of 1.50L/min, brown rice germinated. The growth status, respiratory density of and several compounds contents in germinating brown rice were observed and assayed. The results suggested that Ca2+ could play double roles in brown rice germination,i.e. 0.5mmol/L and 2.5mmol/L Ca2+ could accelerate the growth of brown rice shoot, but 10mmol/L Ca2+ inhibit this process. Itwas also observed that three Ca2+ concentrations mentioned above all enhanced respiratory density of germinating brown rice, increased γ-aminobutyric acid(GABA) contents and impeded the accumulation of Glu in germinating brown rice. These indexes above were dependent on Ca2+ concentration. But on the contents of soluble proteins, free amino acids, starch and reducing sugar, Ca2+ concentration had little effect.

Key words:  , Ca2+； germinating brown rice； physiological index； &gamma, -aminobutyric acid(GABA)； content of essential substances；