Compartment Analysis of Nitrogen Flows through Mature Leaves

概要

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Nitrogen flows in mature leaves of rice, sunflower and corn were analyzed by multicompartment analyses of data from ^<15>N tracer experiments. The four-compartment model fit the measured data better than the two- or three-compartment models. Rate constants of the nitrogen flows, transfers with or without protein turnover and flow through a storage pool of soluble-N, were derived from a least-squares fit between the mathematical expressions and the corresponding measured data. Results of computations indicated the following: The flow of nitrogen through the protein pool was larger than the direct flow in recently matured leaves, whereas the reverse was true in senescent leaves. The presence of a temporary storage pool of soluble N was suggested, and the half-life of the N exchange in that pool was estimated to be roughly the amount of the insoluble N present. in three of the four cases examined. The half-lives of insoluble N (protein) pools were 35 to 150 h. The pool for the N efflux from the leaves was small with the shortest half-lives (most less than 2 h) of N turnover. Some recycling of N during protein turnover was suggested in sunflower leaves, but the extent in the leaves of rice seedlings was estimated to be little.
日本植物生理学会の論文