Characterization of photosynthesis, photoinhibition and the activities of C(4) pathway enzymes in a superhigh-yield rice, Liangyoupeijiu.

Characteristics of photosynthetic gas exchange, photoinhibition and C(4) pathway enzyme activities in both flag leaves and lemma were compared between a superhigh-yield rice (Oryza sativa L.) hybrid, Liangyoupeijiu and a traditional rice hybrid, Shanyou63. Liangyoupeijiu had a similar light saturated assimilation rate (Asat) to Shanyou63, but a much higher apparent quantum yield (AQY), carboxylation efficiency (CE) and quantum yield of CO(2) fixation (PhiCO(2)).

Physiological characteristics of the primitive CO(2) concentrating mechanism in PEPC transgenic rice.

The relationship between carbon assimilation and high-level expression of the maize PEPC in PEPC transgenic rice was studied by comparison to that in the untransformed rice,japonica kitaake. Stomatal conductance and photosynthetic rates in PEPC transgenic rice were higher than those of untransformed rice, but the increase of stomatal conductance had no statistical correlation with that of photosynthetic rate. Under high levels of light intensity, the protein contents of PEPC and CA were increased significantly.