Table I. Means ± se of 14 root parameters across all accessions quantified in control and K deficiency.
The K response ratio (low K/control) was calculated as mean in low K divided by mean in control. Pearson correlation coefficients (r2) are shown for correlation of low-K with control values, computed from averages of each accession in each condition. se values are given in parentheses. n/a, Not available.
| Trait Identifier | Trait Description | Unit | Control | Low K | Low K/Control | r2 |
|---|---|---|---|---|---|---|
| % | ||||||
| TRS | Total root size | cm | 16.48 (0.33) | 4.58 (0.17) | 28 | 0.05 |
| MRP | MR path length | cm | 7.11 (0.12) | 2.72 (0.11) | 38 | 0.23 |
| Apical | Apical zone length | cm | 3.19 (0.07) | 1.08 (0.06) | 34 | 0.18 |
| Branched | Branched zone length | cm | 3.65 (0.08) | 1.44 (0.06) | 39 | 0.21 |
| Basal | Basal zone length | cm | 0.25 (0.01) | 0.19 (0.01) | 76 | 0.07 |
| MR angle | Angle of MR from full verticality | ° | 15.18 (0.5) | 2.42 (0.48) | 16 | 0.41 |
| LRS | LR system size (as proportion of total root size) | % | 55 (1) | 40 (1) | 73 | 0.18 |
| LR # | First-order LR number | 12.65 (0.26) | 7.17 (0.24) | 57 | 0.07 | |
| LRP 0.25 | Mean LR path length in the uppermost quartile of the MR | cm | 1.15 (0.03) | 0.29 (0.02) | 25 | 0.01 |
| LRP 0.50 | Mean LR path length in the second quartile from the top of the MR | cm | 0.44 (0.02) | 0.23 (0.02) | 52 | 0.01 |
| LRP 0.75 | Mean LR path length in the third quartile from the top of the MR | cm | 0.08 (0.01) | 0.15 (0.01) | 188 | 0.03 |
| LRP 1.00 | Mean LR path length in the fourth quartile from the top of the MR | cm | 0 (0) | 0.08 (0.01) | n/a | 0.03 |
| LRdensMR | LR density along the MR | cm−1 | 1.82 (0.03) | 3.16 (0.09) | 174 | 0.49 |
| LRdensBZ | LR density within the branched zone | cm−1 | 3.54 (0.06) | 5.86 (0.17) | 166 | 0.48 |