TABLE 5

Heritability, average number of detected QTL (DS and ES), proportion of detected QTL matching simulated QTL (%), and proportion of genotypic variance explained by QTL (p in %) for plant height calculated using composite interval mapping (CIM) and two cross-validation schemes (standard CV and CV/GE) averaged over 160 or 320 simulated data sets (DS) for six combinations of sample size (N) and number of test environments (E)

Eb
1642
ParameteraN:488122488122488122
Embedded Image 0.8870.8860.6630.6590.4970.489
CIM
DS 12.77.610.05.77.54.7
Matching QTL87.363.684.856.683.153.0
DS 43.641.741.240.937.244.6
SD:DS 36.015.030.310.223.87.2
Standard CV
ES 11.57.28.75.86.64.9
Matching QTL84.957.482.051.580.146.8
ES 42.544.039.346.135.752.7
TS 31.710.625.77.319.15.4
SD:ES 33.112.426.68.420.36.0
CV/GE
ES 11.47.27.95.54.34.1
Matching QTL84.956.581.650.074.641.1
ES 42.744.238.047.630.560.0
TS 29.52.121.3–0.69.8–2.4
SD:ES 32.912.324.17.512.63.8
  • a For details of parameter estimation see materials and methods. Matching QTL (%) are given as the proportion of detected QTL found within a 20-cM interval flanking one of the 21 simulated QTL.

  • b E = 16 corresponds to h2 = 0.888, E = 4to h2 = 0.665, and E = 2to h2 = 0.489.