Abstract:The contents of chlorophyll a and chlorophyll b, as well as the photosynthetic rate and the activity of RuBP carboxylase in leaves of rice ( Oryza sativa L. ) seedlings were apparently decreased by treating with 2.5 x 10-4 mol/L jasmonic acid methyl ester (Ja-Me). The synthesis and contents of RubisCO and its large and small subunit were distinctly reduced by this treatment either. Only did 2.5 x 10-7 mol/L Ja-Me treatment suppress the synthesis of large RubisCO subunit and decrease the content of small RubisCO subunit, it had no effects on the chlorophyll content, photosynthetic rate and RuBP carboxylase activity in leaves of rice seedlings.