GREEN SEED COAT COLOUR RETENTION IN LENTIL - University ...

2005 when individual sites do not have a normal distribution but when all samples
from all sites and years are combined the distribution is normal.
Number of RILs
35
30
25
20
15
10
5
0
2
2.5
3
3.5
4
4.5
5
5.5
6
40
6.5
Index score
Figure 4.1 Histogram of the mean index scores for the RILs used in the heritability
study for green seed coat colour differences in lentil for 2005 and 2006 at
Elrose, SPG, and Sutherland. Arrow denotes where the more desirable parent,
1294M-23, would lie in the histogram.
The data were subjected to an ANOVA using a mixed model. When the
residual analysis was completed it showed a normal distribution of the residues
when using the Shapiro-Wilk test for normality (a=0.05). The Bartlett test for
homogeneity of the variances also showed that the inclusion of both years into the
analysis was justified. This included all of the data from all three sites over the two
year period. The ANOVA showed that the following effects were highly
significant: location, year, location × year interaction, block, genotype, genotype ×
location interaction, genotype × year interaction, and genotype × location × year
interaction. Because genotype was significant some of the variability in index
scores was explained by the genotype. As expected with most quantitative traits,
7
7.5
8
8.5
9
9.5
10