Table 3 ANOVA depicting magnitude of genetic variation for plant height among the 200 subset of sorghum MAGIC population
Mean SquaresVariance Components and Repeatability
20132014CombinedSource20132014Combined
Source of var.d.f.MSd.f.MSd.f.MS
Genotype (G)199760***1991358***1991849***σ2G325582395
Replication1751812*1690*σ2Y12
Year (Y)15187***σ2G × Y58
G × Y199269***σ2e110193152
Residuals199110199194399152σ2T435776618
Total399399799R0.860.860.85
Mean113110183
Min113110111Proportion of Components (%)
Max230250235Source20132014Combined
aSEMg7.49.86.2σ2G757564
aSEMy0.6σ2Y2
aSEMg × y8.7σ2G × Y9
bLSDg20.727.517.1σ2e252525
bLSDy1.7σ2T100100100
bLSDg × y24.2
CV(%)9.312.76.7
  • Analysis results are presented for year 2014 and 2014 independently and in combination. *, **, and *** indicate significance at 0.05, 0.01, and 0.001 probability levels, respectively. σ2G, σ2Y, σ2G × Y, σ2e, and σ2T are the respective variance components for genotype, year, genotype by year interaction, error, and total. “R” is repeatability (analogous to broad sense heritability for estimates in single or few environments) and is a measure of predictability of trait measurements over time. MS, mean squares; d.f., degrees of freedom; Min, minimum; Max, maximum; LSD, least significant difference; CV, coefficient of variation.

  • a The respective SEM for genotypes, year and the interaction between genotype and year.

  • b The least significant difference for genotypes, year and the interaction between genotype and year respectively.