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Table 5 Epistatic interactions for root morphology traits, total seedling dry weight and P content evaluated in low-P conditions

From: Multiple interval QTL mapping and searching for PSTOL1 homologs associated with root morphology, biomass accumulation and phosphorus content in maize seedlings under low-P

Interactions Interaction effecta / R2 (%)b
RL RD SA SA2 R:S TDW Pcont
qMulti1.03 X qMulti1.07 −0.060 0.067 −0.078 −0.183* 0.054 −0.053 −0.005
0.33 0.41 0.56 3.07 0.27 0.25 0.03
qMulti1.03 X qMulti10.03 −0.009 −0.029 −0.029 −0.141+ 0.148* −0.123 −0.235**
0.01 0.08 0.08 1.85 2.04 1.41 5.12
qMulti1.07 X qMulti9.04 0.324*** −0.358*** 0.280** 0.127 −0.108 0.196* 0.067
9.02 11.00 6.76 1.38 1.00 3.31 0.39
qMulti2.08 X qMulti10.03 −0.071 0.179** −0.013 0.115 0.166* 0.028 0.077
0.45 2.86 0.02 1.18 2.47 0.07 0.53
qMulti8.02 X qMulti9.04 0.231** −0.150 0.254* 0.188+ −0.221* 0.307** 0.265**
3.24 1.37 3.93 2.16 2.99 5.74 4.29
  1. aEffects measured as standard deviation from the progeny mean; Positive values indicate that L3 carries the allele for an increase in the trait, and negative values indicate that L22 contributes the allele for an increase in the trait. Interaction effect significances based on p-values were estimated via score statistics resampling (+ p < 0.1, *p < 0.05, ** p < 0.01, ***p < 0.001)
  2. bR2: Ratio of the genotypic variance of the QTL effect to the phenotypic variance, times 100
  3. Traits: root length (RL), root average diameter (RD), root surface area (SA), surface area of fine roots (SA2), total seedling dry weight (TDW), root:shoot ratio (R:S) and total P content (Pcont)