Figures & data
Figure 1 Successive changes in dry weight and in the amount of nitrogen absorbed in various parts of the plant. Data are cumulatively accumulated and the top value is equal to the whole plant dry weight. Bars indicate standard error (SE; n = 3) of the whole plant dry weight. Symbols without bars mean that the SE is so small that it is covered by the symbol. Arrows indicate the date of panicle removal.
Figure 2 Successive changes in root and leaf nitrogen concentration and in the chlorophyll concentration in green leaves of plants with the panicle removed and control plants (no treatment). Arrows indicate the date of panicle removal. Bars indicate standard error. An asterix above the bar indicates that the difference between the control and the panicle removal treatment is significant using a t-test (P < 0.05).
Figure 3 Successive changes in the relative growth rate (RGR; g g−1 day−1), nitrogen uptake rate (ΔN; g N m−2 day−1) and the specific absorption rate of nitrogen (SARN; g N g RW−1 day−1). To calculate RGR, ΔN and SARN, because the experiment was done using only one field, all data obtained at each sampling were averaged and used to calculate the subsequent changes in dry weight and the accumulated amount of nitrogen. Thus, the data are not replicated. Arrows indicate the date of panicle removal.
Figure 4 Successive changes in the xylem sap exudation rate (mL g RW−1 12 h−1) and the cytokinin translocation rate (pmol bAeq. g RW−1 12 h−1). The cytokinin level is indicated as benzyl adenine (BA) eqiuivalents. Arrows indicate the date of panicle removal. Bars indicate standard error (SE) and symbols without bars mean that the SE is so small that it is covered by the symbol. An asterix above the bar indicates that the difference between the control and the panicle removal treatment is significant using a t-test (P < 0.05).
Figure 5 Cytokinin activity using the Amaranthus beta cyanine bioassay in fractions separated using high performance liquid chromatography and identified using standards that separated into each fraction. Bars indicate standard error (SE) and symbols without bars mean that the SE is so small that it is covered by the symbol. An asterix above the bar indicates that the difference between the control and the panicle removal treatment is significant using a t-test (P < 0.05).
