Comparison of photosythesis and metabolite between rice and soybean

Abstract

Soybean have lower nitrogen use efficiency than rice. Lower photosynthetic rate per unit nitrogen of the leaves and high respiratory rate would be one of the reason for lower nitrogen use efficiency in soybean. However, it is not clear about the detail of metabolic mechanism that caused mentioned above physiological phenomenon in the leaves. In this study, photosythesis and metabolite were measured in leaves of rice and soybean in order to get the basic knowledge of the difference of metabolic mechanism.
The quantum yeild of PSII and non-photochemical quenching (qP) was lower in soybean than in rice and Fv'/Fm' in soybean was similar to that in rice. Leaf photosynthetic rate per unit amount of nitrogen, stomatal conductance, and leaf intercellular CO2 concentration in soybean was lower than that in rice. We also measured the primary metabolites with CE/MS and comparison of metabolism between soybean and rice would be futher discussed.