期刊
NEW PHYTOLOGIST
卷 172, 期 4, 页码 696-707出版社
WILEY
DOI: 10.1111/j.1469-8137.2006.01890.x
关键词
maize (Zea mays); modelling; 15N labelling; nitrogen remobilization; nitrogen uptake; nitrogen use efficiency; protein turnover
In maize (Zea mays), nitrogen (N) remobilization and postflowering N uptake are two processes that provide amino acids for grain protein synthesis. To study the way in which N is allocated to the grain and to the stover, two different N-15-labelling techniques were developed. (NO3-)-N-15 was provided to the soil either at the beginning of stem elongation or after silking. The distribution of N-15 in the stover and in the grain was monitored by calculating relative N-15-specific allocation (RSA). A nearly linear relationship between the RSA of the kernels and the RSA of the stover was found as a result of two simultaneous N fluxes: N remobilization from the stover to the grain, and N allocation to the stover and to the grain originating from N uptake. By modelling the N-15 fluxes, it was possible to demonstrate that, as a consequence of protein turnover, a large proportion of the amino acids synthesized from the N taken up after silking were integrated into the proteins of the stover, and these proteins were further hydrolysed to provide N to the grain.
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