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International audienceCorrelation among root, stem, leaf and grain is the basis for theestablishment of photosynthate partitioning model, and is of greatsignificance for rational regulation of plant morphology and populationstructure and improvement of crop economic production. The paper isbased on experiment results of dry mater weight of root, stem, leaf, andgrain of winter wheat of 5 treatments with different water andfertilizer level, and experiment results of soil moisture and soilnitrogen(NH4 + -N和NO3 −+N).The experiment was carried out in the Farmland Water Cycling ExperimentStation of Tianjin Agricultural University in 2008-2009. Therelationships between leaf to root ratio, stem to leaf ratio, and grainto stem ratio with root nitrogen uptake was established, respectively.The results indicted that the leaf to root ratio, and stem to leaf ratiowas more sensitive to water and nitrogen stresses than that of grain tostem ratio. Both the leaf to root ratio and stem to leaf ratio increasedwith the root nitrogen uptake, and had positive correlations with rootnitrogen uptake with the correlation coefficients above 0.91. Thecorrelation between grain to stem ratio and root nitrogen uptake was notsignificant within the given range of water and nitrogen stresses. Theratio of grain to stem under water and nitrogen stresses wasapproximately equal to that without water and nitrogen stresses

Effect of Water and Nitrogen Stresses on Correlation among Winter Wheat Organs