Table 1.
Comparison between conditions and genotypes for the growth and architectural variables of rootstock cuttings cultivated in greenhouse during 45 days under LN or HN irrigation
| Growth parameters | 1103P | RGM | 1103P vs RGM in HN condition | ||||||
|---|---|---|---|---|---|---|---|---|---|
| LN | HN | HN/LN | Statistical significance | LN | HN | HN/LN | Statistical significance | Statistical significance | |
| N tester value | 198.6 ± 19.3 | 286.4 ± 5.2 | 1.44 | * | 247.3 ± 2.6 | 313 ± 21.1 | 1.27 | * | nd |
| Root DW (g) | 3.61 ± 0.73 | 4.31 ± 1.09 | 1.19 | ns | 13.72 ± 1.77 | 11.68 ± 1.60 | 0.85 | ns | * |
| Trunk DW (g) | 10.81 ± 1.72 | 9.47 ± 1.41 | 0.88 | ns | 9.14 ± 0.73 | 13.12 ± 1.74 | 1.44 | ns | ns |
| Shoot DW (g) | 21.19 ± 2.54 | 29.52 ± 3.06 | 1.39 | ns | 37.69 ± 2.39 | 48.80 ± 3.55 | 1.29 | * | * |
| Plant DW (g) | 35.61 ± 4.23 | 42.46 ± 5.13 | 1.19 | ns | 61.53 ± 3.56 | 74.75 ± 4.99 | 1.21 | ns | ** |
| Leaf number | 125.3 ± 7.6 | 147.2 ± 21.8 | 1.17 | ns | 57.0 ± 6.2 | 74.4 ± 6.8 | 1.31 | ns | ns |
| Leaf surface (cm2) | 3581 ± 398 | 5078 ± 224 | 1.42 | ** | 4067 ± 367 | 5636 ± 545 | 1.39 | * | ns |
| Shoot branching parameters | |||||||||
| Total main stem length (cm) | 139.2 ± 28.1 | 221.4 ± 33.7 | 1.59 | ns | 267.7 ± 22.0 | 275.5 ± 33.8 | 1.03 | ns | ns |
| Main stem number | 1.50 ± 0.22 | 1.60 ± 0.27 | 1.07 | ns | 1.25 ± 0.16 | 1.40 ± 0.16 | 1.12 | ns | ns |
| Node number | 30.50 ± 5.20 | 40.30 ± 6.16 | 1.32 | ns | 32.62 ± 3.75 | 32.80 ± 4.30 | 1.01 | ns | ns |
| Internode length (cm) | 4.20 ± 0.37 | 5.42 ± 0.36 | 1.29 | * | 8.24 ± 0.46 | 8.20 ± 0.40 | 1.00 | ns | *** |
| Node number/total main stem length (cm–1) | 0.25 ± 0.02 | 0.19 ± 0.01 | 0.76 | ns | 0.12 ± 0.01 | 0.12 ± 0.01 | 1.00 | ns | ** |
| Total LB number | 28.90 ± 3.63 | 39.40 ± 2.91 | 1.36 | ns | 11.00 ± 2.08 | 16.50 ± 1.89 | 1.50 | ns | *** |
| Total LB length (cm) | 490.4 ± 66.3 | 600.9 ± 49.5 | 1.23 | ns | 98.45 ± 16.13 | 203.4 ± 18.4 | 2.07 | *** | *** |
| LB I number/node number | 0.44 ± 0.05 | 0.49 ± 0.04 | 1.12 | ns | 0.34 ± 0.06 | 0.46 ± 0.04 | 1.36 | *** | ns |
| LB II number/LB I node number | 0.19 ± 0.03 | 0.18 ± 0.03 | 0.93 | ns | 0.02 ± 0.01 | 0.04 ± 0.02 | 1.81 | ns | *** |
| Total LB length/total main stem length (cm cm–1) | 4.88 ± 0.98 | 3.40 ± 0.56 | 0.70 | ns | 0.41 ± 0.09 | 0.89 ± 0.18 | 2.19 | * | ** |
Data are represented as means ±SE, n=10 individual plants. For each variable, asterisks indicate significant differences between HN and LN conditions for each genotype as determined by a Wilcoxon test: *P<0.05, **P<0.01, ***P<0.001; ns, not significant. For comparison between both genotypes in the HN condition (last column), asterisks indicate significant differences between both genotypes as determined with Student’s t-test (with Bonferroni correction): *P<0.05, **P<0.01, ***P<0.001; ns, not significant; nd, not determined. For main stem number a Fisher test was used and for LB I number/node number and LB II number/LB I node number a chi-squared test was used. DW, dry weight; LB, lateral branches.