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. 2016 Apr 2;67(12):3763–3775. doi: 10.1093/jxb/erw133

Table 1.

Michelis–Menten kinetics coefficients calculated for nitrate influx to intact roots of corn grown in hydroponics for 15 or 20 d, deprived for 2 d or 5 d prior to the determination procedure

In each column, values with the same letter are not significantly different at P≤0.05 levels according to the paired t-test. Combinations where net influx (In) responds linearly to the concentration (C) are represented by the linear regression.

Age (d) Deprivation (d) Root class Positiona (cm) I max(pmol cm−2 s−1) K m(µM) C min(µM) R 2 n
15 2 Lateral 0–4 14.66 g 2.68 d 1.70 c 0.82 10
20 2 Lateral 0–4 45.25 a 10.67 c 4.40 ab 0.68 9
4–8 35.81 ab 17.25 bc 1.64 c 0.84 5
20 5 Lateral 0–4 30.54 ab 21.33 bc 4.69 ab 0.55 15
4–8 In=0.4044×C+2.4268 0.79 8
15 2 Seminal 0–4 26.64 bc 10.50 c 2.82 bc 0.79 14
4–8 22.17 c 16.10 bc 2.06 c 0.64 14
20 2 Seminal 0–4 33.76 b 10.31 cd 3.79 a 0.70 18
4–8 30.03 ab 6.72 cd 4.68 ab 0.67 9
15 2 Crown 0–4 14.02 d 15.70 bc 2.36 c 0.82 14
4–8 24.30 c 52.21 a 0.98 c 0.90 14
20 2 Crown 0–4 41.25 a 32.74 ab 6.20 a 0.82 9
4–8 46.52 a 45.49 ab 4.28 ab 0.95 18
20 5 Crown 0–4 In=0.2502×C+1.9036 0.66 18
4–8 In=0.3365×C+0.2930 0.95 18
20 2 Brace 0–4 16.47 cd 28.21 ab 3.22 abc 0.81 6
4–8 In=0.3357×C+0.9501 0.92 7
20 5 Brace 0–4 In=0.2183×C–0.4755 0.73 13
4–8 In=0.2949×C+1.2704 0.86 5

a Distance from the root tip.