Agriculture Reference
In-Depth Information
Analysis of Table 19.4 revealed that on the background of IBCA 5, the combina-
tions were signifi cantly higher than the average population value of sugar content,
while on the background of IBEA—8 combinations. The rate of reaction of the studied
genotypes on EA was specifi c: hybrids increased or lowered the sugar content, some
of them showed stability. However, the range of variation characteristics was different
in two environments. The difference between the highest (MS 1/Ot 2) and the lowest
(MS 3/Ot 4) indexes of the sugar content was higher on the EA: it was 3.3 percent (abs.
index). It was smaller in the environment IBCA—2.0 percent (hybrids MS 2/Ot 1 and
MS 4/Ot 2). In relation to the standard the signifi cant excess was 2.1…3.5 percent
(IBCA) and 2.2…8.0 percent (IBEA). The high sugar content on EA was observed in
hybrids MS 2/Ot 5 (18.6%), MS 5/Ot 1 (18.1%), and MS 1/Ot 2 (18.2%). Combina-
tions of МS 2/Оt 1 (17.8%) and МS 1/Оt 2, МS 1/Оt 3, МS 1/Оt 4, 17.7 percent each,
were the best on IBCA.
Determination of the proportion in the total genotypic variability revealed that it is
larger than on EA (92.4%) compared to CA (83.5%). This indicates a better differen-
tiating ability of EA than CA.
Decomposition of genotypic variance (with the help of dispersive analysis) on the
effects associated with different types of gene interactions showed that nonadditive
effects of genes on EA had a larger proportion (50%) compared to CA (40%) (Figures
19.3 and 19.4).
FIGURE 19.3
Genotypic variability and its share of feature of sugar content of simple sterile
hybrids, 2011-2012, background IBCA.
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