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It is known that C_4 photosynthetic pathwaycontributes to higher CO_2—fixation effieiency.The enzyme activitie required for C_4 pathwayare generally present In C_3 plants such as ricewith much less amount But under photoinhib-itive conditions the activity of stomata closephosphoenol-pyfuvate Carboxylase(PEPCase),a key C_4 photosynthetic enzyme is induced toabout six times higher than that of basal aetivi-ty within 24 hours in leave.fronl a japonica-
It is known that C_4 photosynthetic pathway contributions to higher CO_2-fixation effieiency. The enzyme activitie required for C_4 pathway generally present in C_3 plants such as rice with much less amount But under photohibit-itive conditions the activity of stomata close phosphoenol-pyfuvate carboxylase (PEPCase) a key C_4 photosynthetic enzyme is induced to about six times higher than that of basal aetivi-ty within 24 hours in leave. fronl a japonica-